BRAKE SYSTEM - OBD -1999 Volkswagen Passat GLS Page 1 of 72

ARTICLE BEGINNING

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Tech1 Question: P1857/18265

ABS/EDL/ASR BOSCH 5.3 ON BOARD DIAGNOSTIC (OBD)

FUNCTION

The ABS control module is capable of On Board Diagnostic (OBD). The OBD concept relates
only to the electrical and electronic parts of a system; in other words it only registers malfunctions
which have an effect on the electric signals. Fundamentally, 19 different malfunction sources are
distinguished.

The 26-pin ABS control module w/EDL -J104- forms a compact hydraulic control module with the
hydraulic unit, as does the 31-pin ABS control module with EDL and ASR -J104-. The hydraulic
control module is located on the left-hand side of the engine compartment. The control module is
equipped with DTC memory. The connection for On Board Diagnostic (OBD) is located under the
cover next to the handle on the parking brake lever.

If voltage supply falls below 10 volts, the ABS system shuts off. All relevant warning lamps light
up. The system will switch itself back on though, once voltage supply rises above 10 volts again.
The warning lamps will switch off. For complete loss of voltage, open circuit in a wire or fuse,
only the ABS warning lamp lights up.

NOTE: Anti-Slip Regulation (ASR) is not installed to vehicles with 4Motion

(all-wheel-drive).

The control module recognizes malfunctions during vehicle operation and stores them in a DTC
memory. This information is retained even if battery voltage fails.

Periodically occurring malfunctions are also recognized and stored as DTCs. If this malfunction
does not occur again for 20 vehicle starts or one long trip, the DTC is erased from DTC memory.

After ignition is switched on or engine is started, the ABS warning light -K47-, the traction control
indicator light -K86- (only for vehicles with ASR) and the red warning light for brake system -
K118-, light up for approx. 2 seconds.

Anti-Slip Regulation (ASR) is a vehicle safety system that prevents the wheels from slipping
during acceleration. Depending on the control module coding, ASR is also able to perform an
engine drag-torque regulation (MSR). MSR prevents the powered wheels from being blocked via
an excessive engine braking, e.g. when downshifting. ASR works throughout the entire speed
range. When ASR is in regulation mode, the ASR indicator lamp blinks 3 times per second.

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The ABS control module -J104- installed in the vehicle is coded. New control modules for
vehicles with ASR from the parts distribution center are uncoded and must be coded after being
installed.

A test sequence (self-test) is performed in the control module during this time, with the following
functions:

• Supply voltage is tested (min. 10.0 volts).

• Control module and valve coils are checked
• An electric test of the wheel speed sensors is performed; this test will not complete
successfully unless vehicle is driven for 30 seconds at above 60 km/h.
• The control module coding is being checked.

VAG1551 Scan Tool (ST)

Always initiate On Board Diagnostic (OBD) to start troubleshooting. Electrical malfunctions that
affect braking are stored in DTC memory. They can only be read out with the VAG 1551 scan
tool.

The indicated diagnostic data leads to a DTC table with notes regarding potential malfunction
causes and specific repair procedures.

As of July 1996, display group numbers are entered with 3 digits (current software card version of
the VAG1551 scan tool).

ABS BOSCH 5.3, ABS/EDL BOSCH 5.3 AND ABS/EDL WITH ASR BOSCH 5.3,
APPLICATION

Brake boost is supported by vacuum pressure.

Characteristics:

ABS - Bosch 5.3

1. Brake booster
2. Hydraulic unit
3. Control module, 26-pin (bolted to hydraulic unit)

Fig. 1: Identifying Brake Booster And Hydraulic Unit (ABS - Bosch 5.3)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Characteristics:

ABS/EDL - and ABS/EDL with ASR - Bosch 5.3

1. Brake booster
2. Hydraulic unit
3. Control module, 26-pin for ABS/EDL and 31-pin for ABS/EDL with ASR (bolted to
hydraulic unit)

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4. Membrane run-off damper (discontinued as of 5.97)

Fig. 2: Identifying Brake Booster, Hydraulic Unit And Membrane Run-Off Damper
(ABS/EDL And ABS/EDL With ASR - Bosch 5.3)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

ON BOARD DIAGNOSTIC (OBD), TECHNICAL DATA

ABS control module -J104-

The part numbers listed here are used in production. The part numbers may vary for replacement
parts however.

VAG1551 Scan Tool (ST) indicates control module identification during DTC memory check, e.g.

DTC memory

DTC memory contents remain intact even without voltage supply.

Data output occurs in operating mode 1 (rapid data transfer)

SAFETY PRECAUTIONS AND TROUBLESHOOTING BASICS

General information for troubleshooting

NOTE:
• ABS is a vehicle safety system; specific system knowledge is
absolutely necessary for working on the system.
• Before working on the ABS system, Check DTC Memory to
determine existing malfunctions and to perform guided
troubleshooting.
• Make sure ignition is switched off before disconnecting
harness connectors.
• Do not drive with connector disconnected from ABS control
module.
• Malfunctions in the ABS system are indicated by illumination of
the ABS warning light. Certain malfunctions cannot be
recognized until vehicle is driven for 30 seconds above the
minimum speed of 60 km/h is reached (road test vehicle).

NOTE:
• If the ABS warning light -K47 and the warning light for brake
system -K118- are not lit, but the brake system is not
functioning properly, check for malfunctions in the
mechanical/hydraulic part of the brake system.

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ABS BOSCH 5.3, ABS/EDL BOSCH 5.3 AND ABS/EDL WITH ASR BOSCH 5.3;
TROUBLESHOOTING USING VAG1551 SCAN TOOL (ST) (FLOW CHART)

Fig. 3: ABS Bosch 5.3, ABS/EDL Bosch 5.3 And ABS/EDL With ASR Bosch 5.3;
Troubleshooting Flow Chart (1 Of 2)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Fig. 4: ABS Bosch 5.3, ABS/EDL Bosch 5.3 And ABS/EDL With ASR Bosch 5.3;
Troubleshooting Flow Chart (2 Of 2)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

ABS/EDL/ASR BOSCH 5.3, ELECTRICAL/ELECTRONIC

COMPONENTS AND INSTALLED POSITIONS
The following list pertains to Fig. 5.

1. ABS hydraulic unit -N55-

The hydraulic unit consists of the following components:

• ABS return flow pump - V39-

• Checked electrically via On Board Diagnostic (OBD)
• Valve block (contains inlet and outlet valves)
• ABS return flow pump - V39- and valve block must not be separated from each other.

See ANTI LOCK BRAKE SYSTEM

• Multi-pin harness connector with terminal assignment, see MULTI-PIN HARNESS

CONNECTOR WITH TERMINAL ASSIGNMENTS
2. ABS control module (w/EDL) - J104-
• Checked electrically via On Board Diagnostic (OBD)
• Installation location: At hydraulic unit on left side of engine compartment.
• Test of multi-pin connector to control module, see MULTI-PIN HARNESS
CONNECTOR WITH TERMINAL ASSIGNMENTS
• Do not disconnect harness connector (26-pin) until after successful On Board
Diagnostic (OBD). Switch ignition off before disconnecting harness connector.
3. Hydraulic unit for ABS/EDL and ABS/EDL with ASR -N55-

The hydraulic unit consists of the following components:

• ABS return flow pump - V39-

• Checked electrically via On Board Diagnostic (OBD)
• Valve block (contains inlet and outlet valves)
• ABS return flow pump - V39- and valve block must not be separated from each other.

See ANTI LOCK BRAKE SYSTEM

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• Multi-pin harness connector with terminal assignment, see MULTI-PIN HARNESS

CONNECTOR WITH TERMINAL ASSIGNMENTS

Characteristic:

Can only be identified externally via the differing part numbers for the hydraulic control
units.

4. Control module for ABS/EDL and ABS/EDL with ASR -J104-

• Checked electrically via On Board Diagnostic (OBD)
• Installation location: At hydraulic unit on left side of engine compartment.
• Test of multi-pin connector to control module, see MULTI-PIN HARNESS
CONNECTOR WITH TERMINAL ASSIGNMENTS
• Do not disconnect harness connector (26-pin or 31- pin) until after successful On
Board Diagnostic (OBD). Switch ignition off before disconnecting harness connector.

Characteristic:

Can only be identified externally via the differing part numbers for the hydraulic control
units.

For ASR, the connection of the wiring harness for the ABS control module - J104- has 5
additional terminals (31-pin).

5. Traction control indicator light -K86-

• Installation location: In instrument cluster

Function: see ABS/EDL/ASR BOSCH 5.3, INDICATION OF MALFUNCTIONS VIA

WARNING LAMPS

6. Warning light for brake system - K118-

• Installation location: In instrument cluster

Function: see ABS/EDL/ASR BOSCH 5.3, INDICATION OF MALFUNCTIONS VIA

WARNING LAMPS

7. ABS warning light -K47-

• Installation location: In instrument cluster

Function: see ABS/EDL/ASR BOSCH 5.3, INDICATION OF MALFUNCTIONS VIA

WARNING LAMPS

8. Brake system vacuum pump - V192-

• not installed in all vehicles
• Installation location: At left in engine compartment
• checked in Engine Control Module (ECM) via On Board Diagnostic (OBD)
• Removing and installing

See ANTI LOCK BRAKE SYSTEM

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• Checking

See ANTI LOCK BRAKE SYSTEM

9. Brake booster pressure sensor - G294-

• not installed in all vehicles
• Installation location: in vacuum hose at brake booster
• checked in Engine Control Module (ECM) via On Board Diagnostic (OBD)
• Removing and installing

See

10. Brake light switch -F

• Adjusting, see BRAKE LIGHT SWITCH -F-, ADJUSTING
• Can be checked in measuring value block, see READ MEASURING VALUE
BLOCK (FUNCTION 08)
11. Data Link Connector (DLC)
• Installed location up to model year 2000: Below cover next to handle of parking brake
lever
• Installed location from model year 2001: Below driver-side storage compartment
12. Rotor for front left and front right wheel speed sensors
• Removing and installing
See Axle shafts, servicing .
13. Right and left front ABS wheel speed sensors - G45- / - G47-
• Checked electrically via On Board Diagnostic (OBD)
• Removing and installing

See REMOVING AND INSTALLING SPEED SENSOR ON FRONT AXLE

14. Right and left rear ABS wheel speed sensors - G44- / - G46-

(illustration for Front Wheel Drive - FWD-)

• Checked electrically via On Board Diagnostic (OBD)

• Removing and installing

See PARTS OF ABS SYSTEM ON FRONT AND REAR AXLES, REMOVING

AND INSTALLING

15. Rotor for rear left and rear right wheel speed sensors
• Removing and installing

See Axle shafts, servicing

Fig. 5: Identifying ABS/EDL/ASR Bosch 5.3, Electrical/Electronic Components

Courtesy of VOLKSWAGEN OF AMERICA, INC.

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ABS/EDL/ASR BOSCH 5.3, INDICATION OF MALFUNCTIONS VIA

WARNING LAMPS
Warning lamps (previous instrument cluster)

WARNING LAMPS LIGHT DESCRIPTION (PREVIOUS INSTRUMENT CLUSTER)

Item no. Description

1 Traction control indicator light -K86- for Anti-Slip Regulation (ASR)
2 Brake pad wear indicator light -K32-
3 ABS warning light -K47-
4 Warning light for brake system - K118-
5 Brake and parking brake warning light -K7-

Fig. 6: Identifying Warning Lamp (Previous Instrument Cluster)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Warning lamps

Fig. 7: Identifying Warning Lamp (New Instrument Cluster)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

WARNING LAMPS LIGHT DESCRIPTION (NEW INSTRUMENT CLUSTER)

Item no. Description

1 Traction control indicator light - K86- for Anti-Slip Regulation
(ASR)
2 Brake pad wear indicator light - K32-
3 ABS warning light -K47-
4 Warning light for brake system - K118-

In the new instrument cluster, the function of the brake and parking brake warning light -
K7- has been transferred to the warning light for brake system -K118-.

ABS warning light -K47-

• If the ABS warning light -K47- (item no. 3) does not go out after the ignition is switched on
and the test sequence is complete, it could be caused by the following errors:

a. -a- voltage supply is under 10 volts.

b. -b- there is a malfunction in the hydraulic control module; ABS system is therefore not
operating.

Account for differences in braking behavior. When the ABS warning lamp is lit up, the rear
wheels may lock prematurely during braking!

c. -c- there was a periodic wheel speed sensor malfunction since the last vehicle start.

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If this is the case, the ABS warning lamp will go out automatically after vehicle is started
again and a speed of 2.75 km/h has been exceeded.

d. -d- there is an open circuit in the connection from instrument cluster to ABS control module
(w/EDL) -J104-.
e. -e- ABS warning light is faulty

Fig. 8: Abs Warning Light -K47-

Courtesy of VOLKSWAGEN OF AMERICA, INC.

ABS warning light -K47- and warning light for brake system -K118-

• If the ABS warning light -K47- (item no. 3, Fig. 9) does switch off, but the warning light for
brake system -K118- remains lit, the malfunction causes could include:
a. -a- brake fluid level is too low

After switching ignition on, three warning signals are audible.

b. -b- there is a malfunction in the wire routing to the warning light for brake system -
K118-

Fig. 9: ABS Warning Light -K47- And Warning Light For Brake System -K118- (1 Of
2)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

• If the ABS warning light -K47- (item no. 3, Fig. 9) and the warning light for brake system -
K118- (item no. 4) light up, the ABS system is faulty. Account for differences in braking
behavior.

WARNING: When the ABS warning light -K47- and the warning light for
brake system -K118- are lit, the rear wheels can lock early
during braking.

Fig. 10: ABS Warning Light -K47- And Warning Light For Brake System -K118- (2 Of
2)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Traction control indicator light -K86-

• If the traction control indicator light -K86- (item no. 1, Fig. 11) does not go out after the
ignition is switched on and the test sequence is complete, it could be caused by the following
errors:

There is a malfunction that only affects the ASR system. The ABS/EDL and EBD safety
systems are still completely functional.

-a- short circuit to B+ in the ASR button.

The traction control indicator light switches off five minutes after ignition is switched
on.

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Fig. 11: Traction Control Indicator Light -K86- (1 Of 4)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

-b- there is a short circuit to Ground (GND) for activation of the ASR warning lamp.
See Fig. 12.

If this is the case, check the wire from terminal 20 of ABS control module -J104- to
the instrument cluster.

-c- the ABS control module -J104- was coded incorrectly following a malfunction and
the subsequent replacement of the hydraulic control unit.

DTC memory should be checked first in this case, see CHECK DTC MEMORY
(FUNCTION 02). After this, code the ABS control module (w/EDL) -J104- again,
see CODE CONTROL MODULE (FUNCTION 07).

Fig. 12: Traction Control Indicator Light -K86- (2 Of 4)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

• If the traction control indicator light -K86- (item no.1, Fig. 13) did not light up during the
self-test, the following malfunction is present:
-a- the traction control indicator is faulty, see ABS/EDL/ASR BOSCH 5.3,
ELECTRICAL TESTING. Carry out "Electrical test", test step 12.

Fig. 13: Traction Control Indicator Light -K86- (3 Of 4)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Fig. 14: Traction Control Indicator Light -K86- (4 Of 4)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

ABS warning light -K47-, traction control indicator light -K86- and warning light for
brake system -K118-

• If the ABS warning light -K47- (item no. 3, Fig. 15), the traction control indicator light -
K86- (item no. 1), and the warning light for brake system -K118- (item no. 4) do not switch
off, the malfunction causes could include:
-a- the voltage supply for the ABS system is below 10 volts and the vehicle speed is
less than 12 km/h, see ABS/EDL/ASR BOSCH 5.3, ELECTRICAL TESTING.
Carry out "Electrical test", test step 1.
-b- there is a malfunction in the hydraulic control module; ABS system is therefore
not operating.

Account for differences in braking behavior. The rear wheels may lock too early
during braking!

Fig. 15: ABS Warning Light -K47-, Traction Control Indicator Light -K86- And
Warning Light For Brake System -K118- (1 Of 4)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

-c- there was a dynamic wheel speed sensor malfunction during the last driving
period. See Fig. 16.

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In this case, the warning lamps automatically switch off after a new vehicle start once a
speed of 2.75 km/h is exceeded. The prerequisite for this is that the malfunction does not
occur again after the repair work and new test are performed.

Fig. 16: ABS Warning Light -K47-, Traction Control Indicator Light -K86- And
Warning Light For Brake System -K118- (2 Of 4)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

• If the ABS warning light -K47- (item no. 3, Fig. 17) and the traction control indicator light -
K86- (item no. 1) light up after ignition is switched on and self test is completed (test
sequence). The malfunction causes could include:

Account for differences in braking behavior. When the ABS warning lamp is lit up, the rear
wheels may lock prematurely during braking!

-a- There is an open circuit or short circuit to B+ in the wire that controls the ABS
warning lamp -K47-, between terminal 21 of the ABS control module -J104- and the
instrument cluster, see ABS/EDL/ASR BOSCH 5.3, ELECTRICAL TESTING.
Carry out "Electrical test" step 10.

Fig. 17: ABS Warning Light -K47-, Traction Control Indicator Light -K86- And
Warning Light For Brake System -K118- (3 Of 4)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

-b- the voltage supply for the ABS system is below 10 volts and the vehicle speed is
less than 12 km/h, see ABS/EDL/ASR BOSCH 5.3, ELECTRICAL TESTING and
Fig. 18. Carry out "Electrical test", test step 1.

Fig. 18: ABS Warning Light -K47-, Traction Control Indicator Light -K86- And
Warning Light For Brake System -K118- (4 Of 4)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Brake and parking brake warning light -K7-

In the new instrument cluster, the function of the brake and parking brake warning
light -K7- has been transferred to the warning light for brake system -K118-.

• If the brake and parking brake warning light -K7- (item no. 5, Fig. 19) does not go out after
the ignition is switched on, it could be caused by the following errors:
-a- parking brake is engaged.
-b- the switch for the brake and parking brake warning light -K7- is faulty or is
incorrectly adjusted.
-c- there is a malfunction in the wire routing. See appropriate System Wiring
Diagrams article.

Fig. 19: Brake And Parking Brake Warning Light -K7-

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Brake pad wear indicator light -K32-

This warning lamp is not installed in all vehicles.

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• If the brake pad wear indicator light -K32- (item no. 2, Fig. 20) does not switch off 3
seconds after the ignition is switched on or if it lights up when vehicle is driven, it could be
caused by the following malfunctions:
-a- brake pads may be worn.

Check the brake pads at front and rear axles. Replace brake pads if worn.

See Front brakes, servicing and Rear wheel brakes, disc brakes, servicing

-b- there is a malfunction in the wire routing

Fig. 20: Brake Pad Wear Indicator Light -K32-

Courtesy of VOLKSWAGEN OF AMERICA, INC.

ABS/EDL/ASR BOSCH 5.3 ON BOARD DIAGNOSTIC (OBD),

INITIATING

TEST REQUIREMENTS

• Tires on all wheels must be of the same (approved) size and inflated to the specified
pressure.
• Mechanical/hydraulic parts of the brake system with brake light switch and brake lights OK.
• Hydraulic connections and lines are sealed properly (visual check at hydraulic unit, brake
calipers, wheel cylinders, tandem master brake cylinder).
• Harness connector on ABS control module -J104- properly connected (retainer catch
engaged).
• Check connector terminals of ABS components for damage and proper seating.
• All fuses are OK according to wiring diagram (remove fuses from fuse holder for test).
• Supply voltage OK (at least 10 volts).
• The OBD sequence can only be started with the vehicle stationary and the ignition switched
on (or with the engine running).
• Be sure that vehicle electronics are not exposed to electromagnetic forces while the ABS
system is being tested. Keep vehicle at a distance from devices with strong current draw, e.g.
electric welding tools.

SAFETY PRECAUTIONS

WARNING:
• Test equipment must always be secured on the rear seat.
• Drivers must NEVER operate these tools while driving.

SCAN TOOL (ST), CONNECTING

All functions previously performed with the VAG1551 or VAG1552 can also be performed using
the new VAS5051 tester via operating mode vehicle self-diagnosis.

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See operating instructions for the VAS 5051 vehicle tester.

Special Tools and Equipment

• VAS 5051
• tester VAS5051/1 or VAS5051/3 diagnostic cable

Fig. 21: Identifying VAS5051 Tester

Courtesy of VOLKSWAGEN OF AMERICA, INC.

NOTE:
• During On Board Diagnostic (OBD), the ABS function is
switched off in the control module.
• DTC memory can be erased after repair has been completed
and DTC memory has been checked.

Connecting VAS5051, up to model year 2000

• Remove cover in direction of arrow.

• Connect VAS5051 tester to Data Link Connector (DLC) using VAS5051/1 or VAS5051/3
diagnostic cable with ignition switched off.

Fig. 22: Connecting VAS5051

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Connecting VAS5051, from model year 2001

• Connect VAS5051 tester to Data Link Connector (DLC) using VAS5051/1 or VAS5051/3
diagnostic cable with ignition switched off.

Fig. 23: Connecting VAS5051 Tester To Data Link Connector (DLC)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Select operating mode:

◦ Press "Vehicle Self-Diagnosis" selection on display.

Select vehicle system:

◦ Press "03 - Brake electronics" on display.

Display will indicate the control module identification and the coding.

Select diagnostic function:

Display shows all relevant diagnostic functions.

◦ Select the desired function on display.

◦ See repair procedures for further steps.

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NOTE: The following test sequences are described for the VAG1551 Scan
Tool (ST).

VAG1551 SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS

All functions previously performed with the VAG1551 can also be performed using the VAS5051
tester in operating mode "Vehicle Self-Diagnosis":

Special Tools and Equipment

• VAG1551 Scan Tool (ST) or VAG1552 mobile scan tool

Fig. 24: Identifying VAG1551 Scan Tool (ST)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

• VAG1551/3 or 1551/3A adapter cable

Fig. 25: Identifying VAG1551/3 Adapter Cable

Courtesy of VOLKSWAGEN OF AMERICA, INC.

The following warning lamps light up when the VAG1551 Scan Tool (ST) is connected and the
data link to the ABS control module (w/EDL) -J104- has been established:

• ABS or ABS/EDL warning light -K47-.

• Traction control indicator light -K86- (only installed in vehicles equipped with ASR).
• Warning light for brake system -K118-.

NOTE:
• During On Board Diagnostic (OBD), the ABS function is
switched off in the control module.
• DTC memory can be erased after repair has been completed
and DTC memory has been checked.

◦ Unclip cover for Data Link Connector (DLC) next to parking brake lever.
◦ Connect VAG1551 Scan Tool (ST) to Data Link Connector (DLC) using VAG1551/3
diagnostic cable with ignition switched off.

Fig. 26: Connecting VAG1551 Scan Tool (ST) To Data Link Connector (DLC) Using
VAG1551/3 Diagnostic Cable
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Indicated on display

Fig. 27: Display VAG1551 Scan Tool (VAG On Board Diagnostic (OBD)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

1) shown alternately

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NOTE: If nothing is indicated on the display, check the harness connector

for On Board Diagnostic (OBD), see ABS/EDL/ASR BOSCH 5.3,
ELECTRICAL TESTING, Electrical Test; Test step 8 and 9.

• Depending on the program, additional operating information can be printed out by pressing
the HELP button of the VAG1551 scan tool.
• The --> button is used for advancing through the program sequence.
• The PRINT button is used for switching on the printer (lamp in button lights up).

◦ Switch on ignition.
◦ Switch printer on via the print-button (indicator lamp in button lights up).
◦ Press button -1- to select "Rapid data transfer" operating mode 01.

Fig. 28: Connecting VAG1551 Scan Tool (ST) To Data Link Connector (DLC) Using
VAG1551/3 Diagnostic Cable
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Indicated on display

Fig. 29: Display VAG1551 Scan Tool (Enter Address Word XX)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press buttons -0- and -3- (03 is the address word for "brake electronics").

Indicated on display

Fig. 30: Display Vag1551 Scan Tool (0-3 Brake Electronics)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press -Q- button to confirm input.

NOTE: Three warning tones will sound while the control module
identification is checked.

and then, for example, the following is indicated:

Fig. 31: Display VAG1551 Scan Tool (Coding 003 WSC XXXXX)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Indicated:

• The control module part number (8E0 614 111 R).

• The system identification (ABS/ASR 5.3 Front).
• The version number of the control module (e.g. D01).

First number: Hardware version of control module

Second number: Software version of control module

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• The coding (00003) is only required for vehicles with ASR, see "CODE CONTROL
MODULE".
• The workshop code, WSC XXXXX, must be entered in the VAG1551 Scan Tool (ST),
otherwise coding is not possible. The workshop code is only required for vehicles with ASR.

If the control module identification does not appear; press buttons -0- and -1- (01 is the address
word for "Check Control Module Version").

◦ Press --> button.

Indicated on display

Fig. 32: Display VAG1551 Scan Tool (Select Function XX) (1 Of 2)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

NOTE: Pressing the -HELP- button will print out an overview of all of the
possible functions:

Indicated on display; (function selection, e.g. 02 "Check DTC Memory")

Fig. 33: Display VAG1551 Scan Tool (Select Function XX) (2 Of 2)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

NOTE: If one of the following malfunction messages is indicated on the

display, print out possible malfunction causes via the HELP button.

Fuse -S7- for the control module is a possible source of the malfunction.

Fig. 34: Display VAG1551 Scan Tool (Control Module Not Responding)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Check whether ignition is switched on.

Fig. 35: Display VAG1551 Scan Tool (K-Wire Not Switching To B+!)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Malfunctions occurred while checking the control module identification (possible external
sources?)

Fig. 36: Display VAG1551 Scan Tool (No Signal From Control Module!)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Check diagnostic cable as well as the voltage supply and Ground (GND) connection for the
ABS control module (w/EDL) -J104-, Electrical Test, see ABS/EDL/ASR BOSCH 5.3,
ELECTRICAL TESTING
◦ After repairing potential malfunction cause, re-enter address word 03 for "Brake electronics"
and press -Q- button to confirm.

Indicated on display after entering address word 03

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Fig. 37: Display VAG1551 Scan Tool (Scan Tool Sends Address Word 03)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

and then the following is indicated, for example:

Fig. 38: Display VAG1551 Scan Tool (8E0 614 111 ABS 5.3 Front D01)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press --> button.

Indicated on display

Fig. 39: Display VAG1551 Scan Tool (Select Function XX)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

SELECTABLE FUNCTIONS, OVERVIEW

SELECTABLE FUNCTIONS

Description Test
Function
01 - Check Control Module Version, See VAG1551 SCAN TOOL (ST),
See Connecting VAG1551 Scan CONNECTING AND SELECTING
Tool (ST) and selecting functions FUNCTIONS
02 - Check DTC Memory See CHECK DTC MEMORY
(FUNCTION 02)
03 - Output Diagnostic Test Mode See OUTPUT DIAGNOSTIC TEST
(DTM) MODE (DTM) (FUNCTION 03)
05 - Erase DTC Memory See ERASE DTC MEMORY
(FUNCTION 05), END OUTPUT
(FUNCTION 06)
06 - End Output See ERASE DTC MEMORY
(FUNCTION 05), END OUTPUT
(FUNCTION 06)
07 - Code Control Module See CODE CONTROL MODULE
(FUNCTION 07)
08 - Read Measuring Value Block See READ MEASURING VALUE
BLOCK (FUNCTION 08)

CHECK DTC MEMORY (FUNCTION 02)

Indicated on display (function selection)

Fig. 40: Display VAG1551 Scan Tool (Select Function XX)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press buttons 0- and -2- to select "Check DTC Memory", function 02.

Indicated on display

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Fig. 41: Display VAG1551 Scan Tool (02- Check DTC Memory)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press -Q- button to confirm input.

Number of stored DTCs or "No DTC recognized" will be indicated on display.

Fig. 42: Display VAG1551 Scan Tool (X - Malfunctions Recognized)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

The stored malfunctions are displayed and printed out in sequence.

Vehicles with ABS/EDL and ASR

◦ Using the DTC print-out, repair malfunction as instructed in DTC table, see DIAGNOSTIC
TROUBLE CODE (DTC) TABLE.

If "No DTC recognized" is displayed, the program will return to "Select function XX" after the -->
button is pressed:

Fig. 43: Display VAG1551 Scan Tool (No Malfunctions Recognized)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Indicated on display (function selection)

Fig. 44: Display VAG1551 Scan Tool (Select Function XX)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ End Output (function 06), see ERASE DTC MEMORY (FUNCTION 05), END
OUTPUT (FUNCTION 06).
◦ Switch off ignition and disconnect diagnostic connector.

Work procedure upon recognizing a malfunction:

1. Repair malfunction as instructed in DTC table, see DIAGNOSTIC TROUBLE CODE

(DTC) TABLE.
2. Check DTC Memory (function 02)
3. Erase DTC Memory (function 05)
4. End Output (function 06)
5. Road test vehicle (at above 60 km/h for 30 seconds)
6. Check DTC Memory again

DIAGNOSTIC TROUBLE CODE (DTC) TABLE

Tips Click a link to view tip

Tech1 Question: o3 passat abs code 18055?
Heathro Question: Code 00283 - '03 Passat W8 - NO SPEAK VW...

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BRAKE SYSTEM - OBD -1999 Volkswagen Passat GLS Page 18 of 72

NOTE: For DTC table

• The DTC table lists all malfunctions that can be recognized by

the ABS control module -J104- and printed out by the VAG1551
scan tool.
• The DTC appears (in operating mode "Rapid Data Transfer")
only on the print-out.

Example:

DTC

5-digit

00277

• The column "Printed output from VAG1551 Scan Tool (ST)"

contains notes regarding the type of malfunction.
• The column "Corrective action" refers to specific test steps of
the Electrical Test.
• Sporadically occurring malfunctions are identified via
indication of "/SP" on the right-hand side of the display.
• Static malfunctions that cannot be detected when the vehicle is
stationary are also identified with "/SP" if the ignition has been
switched off and then on again.
• Before replacing the component determined to be faulty, check
all relevant harness connectors, wires and Ground (GND)
connections according to wiring diagram.

DIAGNOSTIC TROUBLE CODE (DTC) - NO MALFUNCTION RECOGNIZED

Printed Possible cause Corrective action

output from
VAG1551
Scan Tool
(ST)
No If "No malfunction recognized" is indicated after repair work has been
malfunction completed, output Diagnostic Test Mode (DTM) is completed.
recognized If ABS does not function properly despite the indication "No malfunction
recognized", proceed as follows:

1. Road test vehicle, drive for 30 seconds at above 60 km/h;

2. Check DTC Memory again, if there still aren't any malfunctions
stored;
3. Continue troubleshooting without using On Board Diagnostic (OBD)
and perform the electrical test, see ABS/EDL/ASR BOSCH 5.3,
ELECTRICAL TESTING in its entirety.

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DIAGNOSTIC TROUBLE CODE (DTC) 00283

Printed output from Possible cause Corrective action

VAG1551 Scan Tool
(ST)
00283 Left front ABS
wheel speed sensor - • Left rear ABS wheel ◦ Check installation of ABS
G47-(1) or: speed sensor -G47- wheel speed sensor.
installed incorrectly.
See PARTS OF ABS
SYSTEM ON FRONT
AND REAR AXLES,
REMOVING AND
INSTALLING

• ABS wheel speed sensor ◦ Check rotor, clean or

rotor dirty or damaged. replace

See PARTS OF ABS

SYSTEM ON FRONT
AND REAR AXLES,
REMOVING AND
INSTALLING

• Excessive wheel bearing ◦ Replace wheel bearing

play.
See Front suspension,
servicing .

• ABS wheel speed sensor - ◦ Check wheel speed sensor,

G47- faulty. "Read Measuring Value
Block", see READ
MEASURING VALUE
BLOCK (FUNCTION
08), display group number
1.

• Short circuit to Ground ◦ Test step no. 5, see

(GND). ABS/EDL/ASR BOSCH
5.3, ELECTRICAL
TESTING, electrical test.

Left front ABS wheel • Open circuit or short ◦ If nothing is displayed

speed sensor -G47-, circuit to B+ in wiring during the "Read
Open circuit/short between ABS wheel speed Measuring Value Block"
circuit to B+ function and no

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool
(ST)
sensor -G47- and ABS malfunction could be
control module -J104-. found in the wiring or the
ABS wheel speed sensor,
replace the hydraulic
control unit.

(1) Malfunction type is recognized when vehicle is driven for 30 seconds at above 60 km/h

DIAGNOSTIC TROUBLE CODE (DTC) 00285

Printed output from Possible cause Corrective action

VAG1551 Scan Tool
(ST)
00285
Right front ABS wheel • Right front ABS wheel ◦ Check installation of ABS
speed sensor -G45-(1) or: speed sensor -G45- wheel speed sensor.
installed incorrectly.
See PARTS OF ABS
SYSTEM ON FRONT
AND REAR AXLES,
REMOVING AND
INSTALLING

• ABS wheel speed ◦ Check rotor, clean or

sensor rotor dirty or replace
damaged.
See PARTS OF ABS
SYSTEM ON FRONT
AND REAR AXLES,
REMOVING AND
INSTALLING

• Excessive wheel ◦ Replace wheel bearing

bearing play.
See Front suspension,
servicing

• ABS wheel speed ◦ Check wheel speed sensor,

sensor -G45- faulty. "Read Measuring Value
Block", see READ
MEASURING VALUE
BLOCK (FUNCTION 08),
display group number 1.

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool
(ST)

• Short circuit to Ground ◦ Test step no. 4, see

(GND). ABS/EDL/ASR BOSCH
5.3, ELECTRICAL
TESTING, electrical test.

Right front ABS wheel

speed sensor -G45- Open • Incorrect control ◦ Check control module
circuit/short circuit to B+ module identification. identification, see
VAG1551 SCAN TOOL
(ST), CONNECTING
AND SELECTING
FUNCTIONS.

• Open circuit or short ◦ If nothing is displayed

circuit to B+ in wiring during the "Read Measuring
between Right front Value Block" function and
ABS wheel speed no malfunction could be
sensor -G45- and ABS found in the wiring or the
control module -J104-. ABS wheel speed sensor,
replace the hydraulic control
unit.

(1) Malfunction type is recognized when vehicle is driven for 30 seconds at above 60 km/h

DIAGNOSTIC TROUBLE CODE (DTC) 00287

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)

00287 • Right rear ABS wheel ◦ Check installation of ABS

Right rear ABS wheel speed sensor -G44- wheel speed sensor.
speed sensor -G44-(1) or: installed incorrectly.
• ABS wheel speed See PARTS OF ABS
sensor rotor dirty or SYSTEM ON FRONT
damaged. AND REAR AXLES,
REMOVING AND
• Excessive wheel INSTALLING
bearing play.
• ABS wheel speed ◦ Check rotor, clean or
sensor -G44- faulty. replace
• Short circuit to
Ground (GND). See PARTS OF ABS
SYSTEM ON FRONT
AND REAR AXLES,
REMOVING AND
INSTALLING

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
◦ Replace wheel bearing

See Front suspension,

servicing

◦ Check wheel speed sensor,

"Read Measuring Value
Block", see READ
MEASURING VALUE
BLOCK (FUNCTION
08), display group number
1.
◦ Test step no. 6, see
ABS/EDL/ASR BOSCH
5.3, ELECTRICAL
TESTING, electrical test.

Right rear ABS wheel • Incorrect control ◦ Check control module

speed sensor -G44- Open module identification. identification, see
circuit/short circuit to B+ • Open circuit or short VAG1551 SCAN TOOL
circuit to B+ in wiring (ST), CONNECTING
between Right rear AND SELECTING
ABS wheel speed FUNCTIONS.
sensor -G44- and ABS ◦ If nothing is displayed
control module -J104- during the "Read
. Measuring Value Block"
function and no
malfunction could be
found in the wiring or the
ABS wheel speed sensor,
replace the hydraulic
control unit.

(1) Malfunction type is recognized when vehicle is driven for 30 seconds at above 60 km/h

DIAGNOSTIC TROUBLE CODE (DTC) 00290

Printed output Possible cause Corrective action

from VAG1551
Scan Tool (ST)

00290 • Left rear ABS wheel speed ◦ Check installation of ABS

Left rear ABS sensor -G46- installed wheel speed sensor.
wheel speed incorrectly.
sensor -G46-(1) See PARTS OF ABS
or: SYSTEM ON FRONT AND
REAR AXLES,

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Printed output Possible cause Corrective action

from VAG1551
Scan Tool (ST)
REMOVING AND
INSTALLING

• ABS wheel speed sensor ◦ Check rotor, clean or replace

rotor dirty or damaged.
See PARTS OF ABS
SYSTEM ON FRONT AND
REAR AXLES,
REMOVING AND
INSTALLING

• Excessive wheel bearing ◦ Replace wheel bearing

play.
See Front suspension,
servicing

• ABS wheel speed sensor - ◦ Check wheel speed sensor,

G46- faulty. "Read Measuring Value
Block", see READ
MEASURING VALUE
BLOCK (FUNCTION 08),
display group number 1.

• Short circuit to Ground ◦ Test step no. 7, see

(GND). ABS/EDL/ASR BOSCH 5.3,
ELECTRICAL TESTING,
electrical test.

Left rear ABS • Open circuit or short circuit ◦ If nothing is displayed during
wheel speed to B+ in wiring between the "Read Measuring Value
sensor -G46- Left rear ABS wheel speed Block" function and no
Open circuit/short sensor -G46- and ABS malfunction could be found in
circuit to B+ control module -J104-. the wiring or the ABS wheel
speed sensor, replace the
hydraulic control unit.

(1) Malfunction type is recognized when vehicle is driven for 30 seconds at above 60 km/h

DIAGNOSTIC TROUBLE CODE (DTC) 00301

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)

00301 • Malfunction in hydraulic ◦ Erase DTC Memory 05,

ABS return flow pump - control module see ERASE DTC
V39 - MEMORY
(FUNCTION 05), END
OUTPUT
(FUNCTION 06).
◦ End Output, see
ERASE DTC
MEMORY
(FUNCTION 05), END
OUTPUT
(FUNCTION 06)
◦ Switch off ignition.
◦ Switch on ignition
◦ If malfunction occurs
again, replace hydraulic
control unit.

00526 • Brake light switch faulty ◦ Check brake light

Brake light switch -F- Open or incorrectly adjusted. switch, "Read
circuit • Both brake lights -M9- Measuring Value
(left) and -M10- (right) Block", see READ
malfunctioning. MEASURING VALUE
BLOCK (FUNCTION
• Wire from brake lights to 08), display group 2.
control module faulty.
◦ Adjust brake light
• ABS control module - switch if necessary, see
J104- malfunctioning BRAKE LIGHT
SWITCH -F-,
ADJUSTING
◦ Locate and repair open
circuit or short circuit.
◦ Replace bulbs.

DIAGNOSTIC TROUBLE CODE (DTC) 00529

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)

00529 • Open circuit or short ◦ Locate and repair open

Wheel speed information circuit to B+ or Ground circuit or short circuit.
missing (GND) in wiring ◦ Check engine speed,
No signal between ABS control "Read Measuring Value
module -J104- and

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BRAKE SYSTEM - OBD -1999 Volkswagen Passat GLS Page 25 of 72

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
NOTE: Engine Control Module Block", see READ
Vehicles with (ECM). MEASURING VALUE
ASR system. BLOCK (FUNCTION
08), display group 3.

• Engine Control Module ◦ If the tachometer in the

(ECM) faulty. instrument cluster is
faulty and no
malfunctions can be
found in the wiring, the
Engine Control Module
(ECM) is faulty.

• ABS control module - ◦ If the tachometer in the

J104- malfunctioning instrument cluster
functions properly and
no malfunctions can be
found in the wiring, the
ABS control module
(w/EDL) -J104- is
faulty.

DIAGNOSTIC TROUBLE CODE (DTC) 00532

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
00532
Voltage supply • Open circuit or See Test step no.1,
Signal too small contact resistance too ABS/EDL/ASR BOSCH 5.3,
high between voltage ELECTRICAL TESTING,
NOTE: supply from terminal electrical test
15 to hydraulic
• This control unit, terminal ◦ Locate and repair open
malfunction 15. circuit in voltage supply.
affects the
voltage
supply of
the control
• Voltage jumps in ◦ Check battery, Generator
module. vehicle system. (GEN) and Voltage
Regulator (VR).
• This DTC is
only
stored, if As soon as vehicle voltage
the is above 10 volts again,
malfunction the ABS, ABS/EDL or
ASR system is switched

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)

back on and the warning

lights turn off.

◦ Check Ground (GND)

connections

• Malfunction in ◦ If no malfunctions can be

hydraulic control found in the voltage
module supply, replace hydraulic
control unit.

DIAGNOSTIC TROUBLE CODE (DTC) 00597

Printed output from Possible cause Corrective action

VAG1551 Scan Tool
(ST)
00597
Varying wheel speed • Wheel or tire sizes not the ◦ Check wheel and tire
impulse same on all four wheels. sizes.

• ABS wheel speed sensor ◦ Check rotor and replace if

rotor dirty or damaged. necessary.

See PARTS OF ABS

SYSTEM ON FRONT
AND REAR AXLES,
REMOVING AND
INSTALLING

• Excessive wheel bearing ◦ Check wheel bearing.

play.
See Front suspension,
servicing

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool
(ST)

• ABS wheel speed sensors - ◦ Check ABS wheel speed

G44-, -G45-, - G46-, and - sensors.
G47- installed incorrectly.
• ABS wheel speed sensors - See PARTS OF ABS SYSTEM
G44-, -G45-, - G46-, and - ON FRONT AND REAR
G47- faulty AXLES, REMOVING AND
INSTALLING , Test step no.4
to 7, and ABS/EDL/ASR
BOSCH 5.3, ELECTRICAL
TESTING, electrical test

DIAGNOSTIC TROUBLE CODE (DTC) 00623

Printed output from Possible cause Corrective action

VAG1551 Scan Tool
(ST)
00623
ABS / transmission Manual transmission ◦ Check coding
electrical connection of
• ABS/EDL/ASR control module - ABS/EDL/ASR
NOTE: J104- incorrectly coded. control module
Vehicles with -J104-, see
ASR system CODE
CONTROL
MODULE
(FUNCTION
07).

• Short circuit to B+ ◦ Locate and

repair short
circuit.

Automatic transmission ◦ Check coding

of
• ABS/EDL/ASR control module - ABS/EDL/ASR
J104- incorrectly coded. control module
-J104-, see
CODE
CONTROL
MODULE
(FUNCTION
07).

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool
(ST)

• Open circuit or short circuit to Ground (GND) in wiring ◦ Locate and

between ABS/EDL/ASR control module - J104- and repair open
Transmission Control Module (TCM) -J217-. circuit or
short circuit.

DIAGNOSTIC TROUBLE CODE (DTC) 00646

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
00646
ABS-ASR motor electrical • Open circuit or short ◦ Locate and repair open
connection 1 circuit to B+ or Ground circuit or short circuit.
(GND) in wiring
NOTE: between ABS control
Vehicles with module -J104- and
ASR system. Engine Control Module
The following (ECM).
signals are
sent via this
connection:

• MMD signal
(Masked Misfire
Diagnostic) for On
Board Diagnostic
(OBD)
• ABS control module - ◦ Replace ABS/EDL/ASR
• SET signal (Specified
J104- malfunctioning hydraulic control unit.
Engine Torque)
• ETR signal (Engine
Torque Reduction
signal)

• Engine Control Module ◦ Replace Engine Control

The transmission travels (ECM) faulty. Module (ECM).
from ABS control module -
J104- to Engine Control
Module (ECM).

DIAGNOSTIC TROUBLE CODE (DTC) 00647

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
00647
ABS-ASR motor electrical • Open circuit or short ◦ Locate and repair open
connection 2 circuit to B+ or Ground circuit or short circuit.
(GND) in wiring ◦ Check Actual Engine
NOTE: between ABS control Torque (AET), "Read
Vehicles with module -J104- and Measuring Value
ASR system. Engine Control Module Block", See READ
The following (ECM). MEASURING VALUE
signals are
sent via this
BLOCK (FUNCTION
connection: 08), display group 3.

• AET signal (Actual

Engine Torque) • Engine Control Module ◦ Replace Engine Control
(ECM) faulty. Module (ECM).
The transmission travels
from Engine Control
Module (ECM) to ABS • ABS/EDL/ASR control ◦ Replace ABS/EDL/ASR
control module -J104-. module -J104- faulty. hydraulic control unit.

DIAGNOSTIC TROUBLE CODE (DTC) 00761 TO 01130

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)

00761 • A DTC was stored in ◦ Repair the engine

DTC stored in Engine the Engine Control management
Control Module (ECM) Module (ECM). The malfunction using the
Engine Control Module appropriate engine
NOTE: (ECM) is not able to Repair Manual and
Vehicles with reduce engine torque. Erase DTC Memory of
ASR system. the Engine Control
Module (ECM).

01044 Control module The ABS control module ◦ Code the control module
incorrectly coded (w/EDL) - J104- is either not
coded or incorrectly coded. See CODE CONTROL
MODULE
(FUNCTION 07)

01130 ABS operation Electrical malfunctions due Procedure:

Implausible signal(1) to foreign disturbance (high
frequency radiation, e.g. ◦ Check all wires and
uninsulated ignition cable) harness connectors for
short circuit to B+ or
Ground (GND).

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
◦ Erase DTC Memory
◦ Road test vehicle, drive
for 30 seconds at above
60 km/h
◦ Check DTC Memory
again

(1) Malfunction type is recognized when vehicle is driven for 30 seconds at above 60 km/h

DIAGNOSTIC TROUBLE CODE (DTC) 01200

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
01200
Supply voltage for ABS • Open circuit or See Test step no.2, see
valves contact resistance too ABS/EDL/ASR BOSCH 5.3,
high between voltage ELECTRICAL TESTING,
NOTE: supply from terminal electrical test
This 30 hydraulic control
malfunction unit, terminals 17 and ◦ Locate and repair open
affects the 18. circuit in voltage supply.
voltage supply ◦ Check battery, Generator
of the ABS
• Voltage jumps in
hydraulic unit vehicle system. (GEN) and Voltage
-N55- and the Regulator (VR).
motor for the ◦ Check relay for solenoid
ABS return valve, "Read Measuring
flow pump - Value Block", see READ
V39-.
MEASURING VALUE
BLOCK (FUNCTION
08), display group 2.

◦ Malfunction in • If no malfunctions are

hydraulic control found in the voltage
module supply:

See Function 03, output

Diagnostic Test Mode
(DTM). Refer to
OUTPUT
DIAGNOSTIC TEST
MODE (DTM)
(FUNCTION 03)

DIAGNOSTIC TROUBLE CODE (DTC) 01201

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
01201
Supply voltage for ABS • Open circuit or See Test step no.2. Refer to
pump contact resistance too ABS/EDL/ASR BOSCH 5.3,
high in Ground ELECTRICAL TESTING,
NOTE: (GND) supply to electrical test
This hydraulic control unit,
malfunction terminal 16. ◦ Locate and repair open
affects the circuit in Ground (GND)
Ground (GND) supply.
supply of the
motor for the
ABS return ◦ Check voltage at return
flow pump -
V39-. flow pump, "Read
Measuring Value Block",
see READ
MEASURING VALUE
BLOCK (FUNCTION
08), display group 2.

◦ Malfunction in ◦ If no malfunctions are

hydraulic control found in the voltage
module supply:

See Function 03, output

Diagnostic Test Mode
(DTM). Refer to
OUTPUT
DIAGNOSTIC TEST
MODE (DTM)
(FUNCTION 03)

DIAGNOSTIC TROUBLE CODE (DTC) 001203

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
01203
ABS / instrument cluster • Open circuit in wire ◦ Locate and repair open
electrical connection between instrument circuit.
Open circuit/short circuit to cluster and hydraulic ◦ Check standing time,
Ground (GND) control unit, terminal "Read Measuring Value
10. Block", see READ
NOTE: • Malfunction in MEASURING VALUE
Only for instrument cluster BLOCK (FUNCTION
vehicles 08), Display group
equipped with number 4
EDL.
◦ Check instrument cluster.

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)

DIAGNOSTIC TROUBLE CODE (DTC) 01314

Printed output from Possible cause Corrective action

VAG1551 Scan Tool
(ST)
01314
Engine Control Module • Software version does ◦ Determine the correct part
(ECM) no not match the ABS numbers for the relevant
communication control module -J104- vehicle using the parts
and Engine Control catalog.
Module (ECM). ◦ Perform function 01 -
Check Control Module
Version, see VAG1551
SCAN TOOL (ST),
CONNECTING AND
SELECTING
FUNCTIONS.

• Open circuit, short ◦ Check wires and harness

circuit to B+ or to connectors according to
Ground (GND) in CAN- wiring diagram:
bus wiring to:
• Engine Control Module Refer to Test step no. 14.
(ECM) See ABS/EDL/ASR
BOSCH 5.3,
• ABS control module - ELECTRICAL
J104- TESTING, electrical test

• DTC in Engine Control ◦ Check DTC Memory of

Module (ECM) Engine Control Module
(ECM)

DIAGNOSTIC TROUBLE CODE (DTC) 18034

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)

18034 • Open circuit, short ◦ Be sure that the control

Powertrain CAN-bus circuit to B+ or to modules connected to the
Missing message from Ground (GND) in CAN-bus wires do not
Transmission Control CAN-bus wiring to: have any entries stored in
Module (TCM) DTC memory.

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
• ABS control module - ◦ Determine the correct part
J104- numbers for the relevant
vehicle using the parts
• Transmission Control catalog.
Module (TCM)

◦ Check wires and harness

connectors according to
wiring diagram:

Refer to Test step no. 14.

See ABS/EDL/ASR
BOSCH 5.3,
ELECTRICAL
TESTING, electrical test

• Transmission Control • If malfunction still hasn't

Module (TCM) faulty been repaired, replace
Transmission Control
Module (TCM).

See appropriate Automatic

Transmission article.

DIAGNOSTIC TROUBLE CODE (DTC) 18256

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
18256
Check DTC Memory of the ◦ Be sure that the control
Engine Control Module modules connected to the
(ECM). CAN-bus wires do not
have any entries stored in
DTC memory.

• Open circuit, short ◦ Check wires and harness

circuit to B+ or to connectors according to
Ground (GND) in wiring diagram:
CAN-bus wiring to:
• Engine Control Refer to Test step no. 14.
Module (ECM) See ABS/EDL/ASR
BOSCH 5.3,
• ABS control module - ELECTRICAL
J104- TESTING, electrical test

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DIAGNOSTIC TROUBLE CODE (DTC) 18258

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
18258
Powertrain CAN-bus ◦ Be sure that the control
Missing message from modules connected to the
Engine Control Module CAN-bus wires do not
(ECM) have any entries stored in
DTC memory.
◦ Determine the correct part
numbers for the relevant
vehicle using the parts
catalog.

• Open circuit, short • Check wires and harness

circuit to B+ or to connectors according to
Ground (GND) in wiring diagram:
CAN-bus wiring to:
• Engine Control Refer to Test step no. 14.
Module (ECM) See ABS/EDL/ASR
BOSCH 5.3,
ELECTRICAL
TESTING, electrical test

• Engine Control ◦ Replace Engine Control

Module (ECM) faulty Module (ECM).

DIAGNOSTIC TROUBLE CODE (DTC) 18262

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
18262
Powertrain CAN-bus faulty ◦ Be sure that the control
modules connected to the
CAN-bus wires do not
have any entries stored in
DTC memory.

• Open circuit, short • Check wires and harness

circuit to B+ or to connectors according to
Ground (GND) in wiring diagram:
CAN-bus wiring to:
• ABS control module - Refer to Test step no. 14.
J104- See ABS/EDL/ASR
BOSCH 5.3,

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
• Engine Control ELECTRICAL
Module (ECM) TESTING, electrical test
• Transmission Control
Module (TCM)

DIAGNOSTIC TROUBLE CODE (DTC) 18263

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
18263
Powertrain CAN-bus ◦ Be sure that the control
Software version control modules connected to the
CAN-bus wires do not
have any entries stored in
DTC memory.

• Software version does ◦ Determine the correct part

not match the ABS numbers for the relevant
control module -J104- vehicle using the parts
and Engine Control catalog.
Module (ECM). ◦ Perform function 01 -
Check Control Module
Version, see VAG1551
SCAN TOOL (ST),
CONNECTING AND
SELECTING
FUNCTIONS.

DIAGNOSTIC TROUBLE CODE (DTC) 18265 TO 65535

Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)

18265 • A DTC was stored in ◦ Be sure that the control

Load signal Malfunction the Engine Control modules connected to
reported by Engine Control Module (ECM) the CAN-bus wires do
Module (ECM) not have any entries
stored in DTC memory.

18266 • A DTC was stored in ◦ Be sure that the control

Engine speed signal from the Engine Control modules connected to
Engine Control Module Module (ECM) the CAN-bus wires do
(ECM) Malfunction reported

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Printed output from Possible cause Corrective action

VAG1551 Scan Tool (ST)
by Engine Control Module not have any entries
(ECM) stored in DTC memory.

65535 Control module faulty ◦ Replace hydraulic

Control module faulty control unit

ERASE DTC MEMORY (FUNCTION 05), END OUTPUT (FUNCTION 06)

Requirements

• DTC memory was checked

1. Erase DTC Memory (function 05)

◦ Press --> button.

Indicated on display; (Function selection screen)

Fig. 45: Display VAG1551 Scan Tool (Select Function XX)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press buttons 0- and -5- to select "Erase DTC Memory", function 05.

Indicated on display

Fig. 46: Display VAG1551 Scan Tool (05 - Erase DTC Memory)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press -Q- button to confirm input.

Indicated on display

Fig. 47: Display VAG1551 Scan Tool (DTC Memory Erased)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press --> button.

Indicated on display; (Function selection screen)

Fig. 48: Display VAG1551 Scan Tool (Select Function XX)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

NOTE: • If this is displayed, the check sequence has not been

carried out.

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Fig. 49: Display VAG1551 Scan Tool (DTC Memory

Not Checked)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

• Follow test sequence exactly: First Check DTC

Memory, then erase it.

2. End Output (function 06)

◦ Press buttons -0- and -6- to End Output.

Indicated on display

Fig. 50: Display VAG1551 Scan Tool (06 - End Output)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press -Q- button to confirm input.

Indicated on display

Fig. 51: Display VAG1551 Scan Tool (Enter Address Word XX)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Switch off ignition.

◦ Disconnect harness connector for the VAG1551 scan tool
◦ Switch on ignition.

The ABS warning light -K47- and the warning light for brake system -K118- must go out
after approx. 2 seconds.

◦ Perform a road test. Drive for 30 seconds at above 60 km/h.

CODE CONTROL MODULE (FUNCTION 07)

The ABS control module -J104- installed in the vehicle is coded. New control modules for
vehicles with ASR from the parts distribution center are uncoded and must be coded after being
installed.

Coding is only possible if a dealership number is stored in the VAG1551 scan tool.

NOTE: Anti-Slip Regulation (ASR) is not installed to vehicles with 4Motion

(all-wheel-drive). Coding of the ABS ECM is not possible in vehicles
with 4Motion.

Test sequence

◦ Connect VAG1551 scan tool and select the control module for brake electronics with
ignition switched on (address word 03); see VAG1551 SCAN TOOL (ST),
CONNECTING AND SELECTING FUNCTIONS.

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◦ Read control module version on the display of the VAG1551 Scan Tool (ST).
◦ Press --> button

Indicated on display

Fig. 52: Display VAG1551 Scan Tool (Select Function XX)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press buttons -0- and -7- to select "Code Control Module" function 07 and press -Q- button
to confirm input.

Indicated on display

Fig. 53: Display VAG1551 Scan Tool (07 - Code Control Module)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press -Q- button to confirm input.

Indicated on display:

Fig. 54: Display VAG1551 Scan Tool (Enter Code Number)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Enter the appropriate code number and press -Q- button to confirm input.

Display will indicate the control module identification and the coding entered (e.g. 00003).

Fig. 55: Display VAG1551 Scan Tool (Coding 00003)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press --> button

Indicated on display:

Fig. 56: Display VAG1551 Scan Tool (Select Function XX)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ End Output, see ERASE DTC MEMORY (FUNCTION 05), END OUTPUT
(FUNCTION 06), function 06
◦ Perform a road test. Drive for 30 seconds at above 60 km/h.

NOTE: If the control module is incorrectly coded, the traction control

indicator light -K86- remains constantly lit.
An entry will be made in DTC memory if ABS control module -J104-
is incorrectly coded. See DIAGNOSTIC TROUBLE CODE (DTC)
TABLE,DTC table.

Coding table for ASR control modules without CAN-bus

ASR CONTROL MODULE CODING (W/O CAN-BUS)

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Transmission type Code

Manual transmission 00000
Automatic transmission 00003

Coding table for ASR control modules with CAN-bus

ASR CONTROL MODULE CODING (W/CAN-BUS)

Engine Transmission type Code

V6 Manual transmission 00032
Automatic transmission 00031
1.8L T Manual transmission 00022
Automatic transmission 00021

READ MEASURING VALUE BLOCK (FUNCTION 08)

The control module can transmit numerous measured values. These measured values provide
information about the operational status of the system and the sensors connected to it. In many
cases the data supplied can be used to troubleshoot and repair malfunctions. Because these
measured values cannot all be evaluated simultaneously, they are organized into individual display
groups that can be selected via display group numbers.

◦ Connect VAG1551 Scan Tool (ST), enter address word "03 Brake Electronics" and continue
until "Select function XX" is indicated on display from, see VAG1551 SCAN TOOL (ST),
CONNECTING AND SELECTING FUNCTIONS.

Indicated on display:

Fig. 57: Display VAG1551 Scan Tool (Select Function XX)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press buttons -0- and -8-. This selects "Read Measuring Value Block" function 08.

Indicated on display:

Fig. 58: Display VAG1551 Scan Tool (08 - Read Measuring Value Block)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press -Q- button to confirm input.

Indicated on display:

Fig. 59: Display VAG1551 Scan Tool (Enter Display Group Number XXX)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Enter display group number, see OVERVIEW OF SELECTABLE DISPLAY GROUP

NUMBERS, Overview of selectable display group numbers.

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Overview of selectable display group numbers

OVERVIEW OF SELECTABLE DISPLAY GROUP NUMBERS

Display group Display field Description

number
001 1 Wheel speed at front left wheel speed sensor
(km/h)
2 Wheel speed at front right wheel speed sensor
(km/h)
3 Wheel speed at rear left wheel speed sensor
(km/h)
4 Wheel speed at rear right wheel speed sensor
(km/h)
002 1 Brake light switch
2 Voltage at motor for ABS return flow pump
3 ABS solenoid valve relay
4 Not assigned
003 1 Engine speed: (Vehicles equipped with ASR)
2 Actual engine torque (AET): (Vehicles
equipped with ASR)
3 Traction control (ASR) button: (Vehicles
equipped with ASR)
4 Not assigned
004 1 Standing time: (Only for vehicles equipped
with EDL)
2 EDL shut-off due to excessive brake
temperature
3 EDL/ASR shut-off: (Only for vehicles
equipped with EDL or ASR)
4 Not assigned

Test sequence and test tables with measured values

Display group number 001

◦ Press buttons -0-, -0- and -1-.

◦ Press -Q- button to confirm input.
◦ Measuring value block always has 4 display fields (arrows). Values 1 to 4 in the individual
display fields can be interpreted according to the following test table.

Fig. 60: Display VAG1551 Scan Tool (Read Measuring Value Block)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Use button -1- to select the next lower display group number in sequence; use button -3- to select
the next higher display group number.

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Press the --> button to manually enter the next display group number. After this, the work
sequence "Read Measuring Value Block" must be re-initiated using buttons -0- and -8-.

NOTE: For display group number 001:

The current wheel speeds are indicated. This is useful for checking
wheel speed sensor allocation by wheel. (Vehicle must be raised and
a second technician must turn wheel by hand)

Fig. 61: Rear Measuring Value Block: Display Group Number 001
Courtesy of VOLKSWAGEN OF AMERICA, INC.

1) On Board Diagnostic (OBD) will be terminated by the ABS control module -J104- if road speed
exceeds 19 km/h.

Display group number 002

Indicated on display:

Fig. 62: Display VAG1551 Scan Tool (Enter Display Group Number XXX)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press buttons -0-, -0- and -2-.

◦ Press -Q- button to confirm input.
◦ Measuring value block always has 4 display fields (arrows). Values 1 to 4 in the individual
display fields can be interpreted according to the following test table.

Fig. 63: Display VAG1551 Scan Tool (Read Measuring Value Block)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Use button -1- to select the next lower display group number in sequence; use button -3- to select
the next higher display group number.

Press the --> button to manually enter the next display group number. After this, the work
sequence "Read Measuring Value Block" must be re-initiated using buttons -0- and -8-.

Fig. 64: Rear Measuring Value Block: Display Group Number 002
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Display group number 003

Measuring value block display group 003 should be read with engine running

Indicated on display:

Fig. 65: Display VAG1551 Scan Tool (Enter Display Group Number XXX)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press buttons -0-, -0- and -3-.

◦ Press -Q- button to confirm input.

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◦ Measuring value block always has 4 display fields (arrows). Values 1 to 4 in the individual
display fields can be interpreted according to the following test table.

Fig. 66: Display VAG1551 Scan Tool (Read Measuring Value Block)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Use button -1- to select the next lower display group number in sequence; use button -3- to select
the next higher display group number.

Press the --> button to manually enter the next display group number. After this, the work
sequence "Read Measuring Value Block" must be re-initiated using buttons -0- and -8-.

NOTE: For display group number 003:

Measuring value block display group 003 should be read with engine
running.

Fig. 67: Rear Measuring Value Block: Display Group Number 003 Chart
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Display group number 004

Indicated on display:

Fig. 68: Display VAG1551 Scan Tool (Enter Display Group Number XXX)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press buttons -0-, -0- and -4-.

◦ Press -Q- button to confirm input.
◦ Measuring value block always has 4 display fields (arrows). Values 1 to 4 in the individual
display fields can be interpreted according to the following test table.

Fig. 69: Display VAG1551 Scan Tool (Read Measuring Value Block)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Use button -1- to select the next lower display group number in sequence; use button -3- to select
the next higher display group number.

Press the --> button to manually enter the next display group number. After this, the work
sequence "Read Measuring Value Block" must be re-initiated using buttons -0- and -8-.

Fig. 70: Rear Measuring Value Block: Display Group Number 004
Courtesy of VOLKSWAGEN OF AMERICA, INC.

OUTPUT DIAGNOSTIC TEST MODE (DTM) (FUNCTION 03)

The pump motor can be checked via output Diagnostic Test Mode (DTM), and the correct function
of the hydraulic circuit (allocation of brake pressure lines to wheel brakes and function of valves)
can be checked for mix-ups and leaks.

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NOTE:
• The vehicle must be raised until all wheels are free to turn. ( 2.
technician required for turning wheels)
• Test sequence can always be exited via the -C- button on the
tester.
• Activation time of actuators is limited to 60 or 90 seconds. The
actuator test will be terminated if the "--> button" is not pressed
within this period.
• Pressing the brake pedal repeatedly relieves the vacuum in the
brake booster. This means that more pressure must be applied
to the brake pedal in order to achieve the same fluid pressure
in the brake system as is achieved with vacuum.
• With the vacuum released from the brake booster, it is possible
that the wheels will not lock, see start engine in order to build
up vacuum in the brake booster.

Example:

VAG1551 Display during output Diagnostic Test Mode (DTM)

(e.g. front left wheel, fl)

OUTPUT DIAGNOSTIC TEST MODE (DTM) (1 OF 2)

Output Diagnostic Test Mode (DTM) -->

Ifl: B+ Ofl: 0V fl wheel locked

Ifl = Inlet valve, front left

B+ = Battery Positive Voltage (B+), there is voltage at valve

Ofl = Outlet valve, front left

0V = 0 volts; no voltage at valve

locked/ free = wheel condition, must be checked by 2nd technician

OUTPUT DIAGNOSTIC TEST MODE (DTM) (2 OF 2)

Output Diagnostic Test Mode (DTM) -->

EDL valves/ Hydr-P: B+ Wheel fl/fr lock

Hydr-P = Hydraulic pump

◦ Connect VAG1551 Scan Tool (ST).

◦ Switch on ignition.
◦ Press button -1- to select "Rapid data transfer" operating mode 01.

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◦ Select control module for brake electronics (address word 03); see VAG1551 SCAN TOOL
(ST), CONNECTING AND SELECTING FUNCTIONS

Indicated on display

Fig. 71: Display VAG1551 Scan Tool (03 - Brake Electronics)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press -Q- button to confirm input.

NOTE: Three warning tones will sound while the control module
identification is checked.

◦ The control module version is shown on the display of the VAG1551 Scan Tool (ST).
◦ Press --> button.

Indicated on display

Fig. 72: Display VAG1551 Scan Tool (Select Function XX)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press buttons -0- and -3-.

Indicated on display

Fig. 73: Display VAG1551 Scan Tool (03 - Output Diagnostic Test Mode (DTM)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press -Q- button to confirm input.

NOTE: During the next few work steps, the ABS warning light -K47- will
blink 4 times per second and the warning light for brake system -
K118- will blink 3 times per second.
For vehicles with navigation system, only the ABS warning light -K47
- 4- will blink, 4 times per second.

Indicated on display

Fig. 74: Display VAG1551 Scan Tool (ABS Hydraulic Pump V64)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

NOTE: "ABS hydraulic pump -V64-" is used to refer to "ABS return flow
pump -V39-". Both terms refer to the same component.

ABS return flow pump -V39- should start running.

◦ Press --> button.

Indicated on display

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Fig. 75: Display VAG1551 Scan Tool (Operate Brake)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Operate brake pedal.

◦ Press --> button.

Indicated on display

Fig. 76: Display VAG1551 Scan Tool (IFI: 0V OFI: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Instruct 2nd technician to turn the affected wheel by hand.

NOTE: If wheel does not lock, it is possible that there is a malfunction

in the mechanical/hydraulic part of the brake system.

◦ Press --> button.

Indicated on display

Fig. 77: Display VAG1551 Scan Tool (IFI: B+ OFI: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press --> button.

ABS return flow pump -V39- should start running.

Brake pedal must not give.

If brake pedal gives, there is a malfunction in the hydraulic unit. If this is the case, the
hydraulic unit with the control module must be replaced.

See ANTI LOCK BRAKE SYSTEM .

Indicated on display

Fig. 78: Display VAG1551 Scan Tool (IFI: B+ OFI: B+)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Instruct 2nd technician to turn the affected wheel by hand.

NOTE: If wheel locks, it is possible that the brake pressure lines to the
wheel brakes have been mixed up.

◦ Press --> button.

ABS return flow pump -V39- will stop running.

Indicated on display

Fig. 79: Display VAG1551 Scan Tool (IFI: B+ OFI: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

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◦ Press --> button.

Brake pedal must give noticeably.

If brake pedal does not give, there is a malfunction in the hydraulic unit. If this is the case,
the hydraulic unit with the control module must be replaced.

See ANTI LOCK BRAKE SYSTEM .

Indicated on display

Fig. 80: Display VAG1551 Scan Tool (IFI: 0V OFI: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Instruct 2nd technician to turn the affected wheel by hand.

NOTE: If wheel does not lock, it is possible that there is a malfunction in the
mechanical/hydraulic part of the brake system.

◦ Press --> button.

Indicated on display

Fig. 81: Display VAG1551 Scan Tool (Release Brake)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Remove foot from brake pedal.

◦ Press button.

Indicated on display

Fig. 82: Display VAG1551 Scan Tool (Operate Brake)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Operate brake pedal.

◦ Press --> button.

Indicated on display

Fig. 83: Display VAG1551 Scan Tool (IFR: 0V OFR: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Instruct 2nd technician to turn the affected wheel by hand.

NOTE: If wheel does not lock, it is possible that there is a malfunction in the
mechanical/hydraulic part of the brake system.

◦ Press --> button.

Indicated on display

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Fig. 84: Display VAG1551 Scan Tool (IFR: B+ OFR: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press --> button.

ABS return flow pump -V39- should start running.

Brake pedal must not give.

If brake pedal gives, there is a malfunction in the hydraulic unit. If this is the case, the
hydraulic unit with the control module must be replaced.

See ANTI LOCK BRAKE SYSTEM .

Indicated on display

Fig. 85: Display VAG1551 Scan Tool (IFR: B+ OFR: B+)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Instruct 2nd technician to turn the affected wheel by hand.

NOTE: If wheel locks, it is possible that the brake pressure lines to the
wheel brakes have been mixed up.

◦ Press --> button.

ABS return flow pump -V39- will stop running.

Indicated on display

Fig. 86: Display VAG1551 Scan Tool (IFR: B+ OFR: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press --> button.

Brake pedal must give noticeably.

If brake pedal does not give, there is a malfunction in the hydraulic unit. If this is the case,
the hydraulic unit with the control module must be replaced.

See ANTI LOCK BRAKE SYSTEM .

Indicated on display

Fig. 87: Display VAG1551 Scan Tool (IFR: 0V OFR: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Instruct 2nd technician to turn the affected wheel by hand.

NOTE: If wheel does not lock, it is possible that there is a malfunction in the
mechanical/hydraulic part of the brake system.

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◦ Press --> button.

Indicated on display

Fig. 88: Display VAG1551 Scan Tool (Release Brake)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Remove foot from brake pedal.

◦ Press --> button.

Indicated on display

Fig. 89: Display VAG1551 Scan Tool (Operate Brake)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Operate brake pedal.

◦ Press --> button.

Indicated on display

Fig. 90: Display VAG1551 Scan Tool (IRI: 0V ORI: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Instruct 2nd technician to turn the affected wheel by hand.

NOTE: If wheel does not lock, it is possible that there is a malfunction in the
mechanical/hydraulic part of the brake system.

◦ Press --> button.

Indicated on display

Fig. 91: Display VAG1551 Scan Tool (IRI: B+ ORI: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press --> button.

ABS return flow pump -V39- should start running.

Brake pedal must not give.

If brake pedal gives, there is a malfunction in the hydraulic unit. If this is the case, the
hydraulic unit with the control module must be replaced.

See ANTI LOCK BRAKE SYSTEM .

Indicated on display

Fig. 92: Display VAG1551 Scan Tool (IRI: B+ ORI: B+)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Instruct 2nd technician to turn the affected wheel by hand.

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NOTE: If wheel locks, it is possible that the brake pressure lines to the
wheel brakes have been mixed up.

◦ Press --> button.

ABS return flow pump -V39- will stop running.

Indicated on display

Fig. 93: Display VAG1551 Scan Tool (IRI: B+ ORI: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press --> button.

Brake pedal must give noticeably.

If brake pedal does not give, there is a malfunction in the hydraulic unit. If this is the case,
the hydraulic unit with the control module must be replaced.

See ANTI LOCK BRAKE SYSTEM .

Indicated on display

Fig. 94: Display VAG1551 Scan Tool (IRI: 0V ORI: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Instruct 2nd technician to turn the affected wheel by hand.

NOTE: If wheel does not lock, it is possible that there is a malfunction in the
mechanical/hydraulic part of the brake system.

◦ Press --> button.

Indicated on display

Fig. 95: Display VAG1551 Scan Tool (Release Brake)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Remove foot from brake pedal.

◦ Press --> button.

Indicated on display

Fig. 96: Display VAG1551 Scan Tool (Operate Brake)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Operate brake pedal.

◦ Press --> button.

Indicated on display

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Fig. 97: Display VAG1551 Scan Tool (IRR: 0V ORR: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Instruct 2nd technician to turn the affected wheel by hand.

NOTE: If wheel does not lock, it is possible that there is a malfunction in the
mechanical/hydraulic part of the brake system.

◦ Press --> button.

Indicated on display

Fig. 98: Display VAG1551 Scan Tool (IRR: B+ ORR: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press --> button.

ABS return flow pump -V39- should start running.

Brake pedal must not give.

If brake pedal gives, there is a malfunction in the hydraulic unit. If this is the case, the
hydraulic unit with the control module must be replaced.

See ANTI LOCK BRAKE SYSTEM .

Indicated on display

Fig. 99: Display VAG1551 Scan Tool (IRR: B+ ORR: B+)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Instruct 2nd technician to turn the affected wheel by hand.

NOTE: If wheel locks, it is possible that the brake pressure lines to the
wheel brakes have been mixed up.

◦ Press --> button.

ABS return flow pump -V39- will stop running.

Indicated on display

Fig. 100: Display VAG1551 Scan Tool (IRR: B+ ORR: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press --> button.

Brake pedal must give noticeably.

If brake pedal does not give, there is a malfunction in the hydraulic unit. If this is the case,
the hydraulic unit with the control module must be replaced.

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See ANTI LOCK BRAKE SYSTEM .

Indicated on display

Fig. 101: Display VAG1551 Scan Tool (IRR: 0V ORR: 0V)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Instruct 2nd technician to turn the affected wheel by hand.

NOTE: If wheel does not lock, it is possible that there is a malfunction in the
mechanical/hydraulic part of the brake system.

◦ Press --> button.

Indicated on display

Fig. 102: Display VAG1551 Scan Tool (Release Brake)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Remove foot from brake pedal.

◦ Press --> button.

Indicated on display: (for vehicles with EDL)

Fig. 103: Display VAG1551 Scan Tool (EDL Valves/Hyder P: B+ Wheel FI/FR Lock)
Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Instruct 2nd technician to turn the affected wheel by hand.

NOTE: If wheel does not lock, it is possible that there is a malfunction in the
mechanical/hydraulic part of the brake system.

See ANTI LOCK BRAKE SYSTEM .

◦ Press --> button.

Indicated on display

Fig. 104: Display VAG1551 Scan Tool (Done)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

◦ Press --> button.

NOTE: The ABS warning light -K47- and the warning light for brake
system -K118- switch off. The output Diagnostic Test Mode is
completed.

For vehicles with navigation system, only the ABS warning

light -K47- switches off.

◦ Press --> button.

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Indicated on display

Fig. 105: Display VAG1551 Scan Tool (Select Function XX)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

NOTE: • If the ABS warning light does not go out, there is a

malfunction in the system.
• Follow test sequence exactly: First Check DTC Memory,
then erase it.

◦ End Output (function 06), see ERASE DTC MEMORY (FUNCTION 05), END
OUTPUT (FUNCTION 06).

ABS/EDL/ASR BOSCH 5.3, ELECTRICAL TESTING

For ABS Bosch 5.3, the following versions are possible:

• ABS
• ABS/EDL
• ABS/EDL with ASR

SPECIAL TOOLS AND EQUIPMENT

• VAG1598 test box

• VAG1598/27 adapter
• VAG1594A connector test kit
• VAG1526A multimeter

Fig. 106: Identifying Special Tools

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Test steps , see TEST REQUIREMENTS are valid for:

• Vehicles for which On Board Diagnostic (OBD) does not result in suggestions regarding the
malfunction cause. In this case, the electrical test should be performed in its entirety.
• Vehicles for which On Board Diagnostic (OBD) results in direct suggestions regarding the
malfunction cause. In this case, only perform test steps recommended in the DTC table
(selective troubleshooting).

For an overview of all test steps in the electrical test, see OVERVIEW OF TEST STEPS.

TEST REQUIREMENTS

• Fuses -S7- and -S53- must be OK (remove fuses from fuse holder for test).
• Before beginning the test, switch off ignition and electrical consumers (headlights, lighting,
fans...).

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• Disconnect multi-pin connector from ABS control module (w/EDL) -J104- and connect
VAG1598 test box to connector of wiring harness using VAG1598/27 adapter.

Specified values refer to readings on the VAG1526 and are not necessarily applicable for other test
units.

MULTI-PIN HARNESS CONNECTOR WITH TERMINAL ASSIGNMENTS

NOTE: All terminals omitted here are not occupied at the moment and must
not be connected to other components under any circumstance.

Terminal assignment of harness connector, wiring harness / ABS control module (w/EDL) -
J104-

Fig. 107: Identifying Terminal Assignment Of Harness Connector, Wiring Harness/ABS

Control Module (W/EDL) - J104
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Terminal assignment of harness connectors for voltage supply and On Board Diagnostic
(OBD) with VAG1551 Scan Tool (ST)

Terminal 4 = Ground (GND) (terminal 31)

Terminal 16 = B+ (terminal 30) via S21

Terminal 7 = K-wire to ABS control module (w/EDL) -J104- terminal 11 via connection in
instrument cluster wiring harness (A76)

Fig. 108: Identifying Terminal Assignment Of Data Link Connector (DLC)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

TERMINALS AND WIRE CONNECTION

Terminal Wire connection to component...

1 See Right rear ABS wheel speed sensor -G44- (vehicles with ABS,
ABS/EDL, EDL/ASR and AWD/EDL)
2 See Right rear ABS wheel speed sensor -G44- (vehicles with
EDL/ASR and AWD/EDL)
3 See Right rear ABS wheel speed sensor -G44- (vehicles with ABS
and ABS/EDL), See Right front ABS wheel speed sensor -G45-
(vehicles with EDL/ASR)
4 See Right front ABS wheel speed sensor -G45- (vehicles with ABS,
ABS/EDL and AWD/EDL)
5 See Right front ABS wheel speed sensor -G45- (vehicles with ABS,
ABS/EDL, EDL/ASR and AWD/EDL)
6 See Left front ABS wheel speed sensor -G47- (vehicles with ABS,
ABS/EDL, EDL/ASR and AWD/EDL)
7 See Left front ABS wheel speed sensor -G47- (vehicles with ABS,
ABS/EDL, EDL/ASR and AWD/EDL)

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Terminal Wire connection to component...

8 See Left rear ABS wheel speed sensor -G46- (vehicles with ABS,
ABS/EDL, EDL/ASR and AWD/EDL)
9 See Left rear ABS wheel speed sensor -G46- (vehicles with ABS,
ABS/EDL, EDL/ASR and AWD/EDL)
10 See Instrument cluster (vehicles with ABS/EDL, EDL/ASR and
AWD/EDL) (The time signals used to calculate standing time are
transmitted via terminal 10.)
11 See K-wire
13 See Masked Misfire Diagnostic signal (all vehicles without CAN-
bus) (The Specified Engine Torque signal is also sent via terminal
13.)
14 See Brake light switch -F-
15 See Voltage supply, terminal 15
16 See Terminal 31 (ABS return flow pump -V39-)
17 See Battery + (terminal 30)
18 See Battery + (terminal 30)
19 See Ground (GND) terminal 31 (ABS control module -J104-)
20 See Activation of ASR warning lamp (Only for vehicles with
EDL/ASR)
21 See Activation of ABS warning lamp
23 See Rear left ABS wheel speed sensor output (only for vehicles with
navigation system)
24 See Rear right ABS wheel speed sensor output (only for vehicles
with navigation system)
27 See AET "Actual Engine Torque" (Only for vehicles with EDL/ASR
without CAN-bus)
28 See TI "Transmission Influence" (Only for vehicles with EDL/ASR
without CAN-bus)
29 See CAN-bus wire (Only for vehicles with EDL/ASR). Refer to
appropriate System Wiring Diagrams article.
30 See Engine speed (Only for vehicles with EDL/ASR without CAN-
bus), See CAN-bus wire (Only for vehicles with EDL/ASR). Refer
to appropriate System Wiring Diagrams article.
31 See traction control (ASR) button (Only for vehicles with
EDL/ASR)

Overview of test steps

OVERVIEW OF TEST STEPS

Component to be checked Step

Voltage supply to control module via terminal 15 - Perform TEST STEP 1
Voltage supply of ABS hydraulic unit -N55- and motor - Perform TEST STEP 2
for ABS return flow pump -V39- via terminal 30 at ABS
control module (w/EDL) -J104-

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Component to be checked Step

Function of brake light switch -F- - Perform TEST STEP 3
Resistance of right front ABS wheel speed sensor -G45- - Perform TEST STEP 4
Resistance of left front ABS wheel speed sensor -G47- - Perform TEST STEP 5
Resistance of right rear ABS wheel speed sensor -G44- - Perform TEST STEP 6
Resistance of left rear ABS wheel speed sensor -G46- - Perform TEST STEP 7
Voltage supply for VAG1551, harness connector T16 - Perform TEST STEP 8
Resistance of the K-wire for On Board Diagnostic - Perform TEST STEP 9
(OBD), harness connector T16
Function of ABS warning light -K47- - Perform TEST STEP 10
Function of warning light for brake system -K118- - Perform TEST STEP 11
Function of traction control indicator light -K86- - Perform TEST STEP 12
Function of traction control button - Perform TEST STEP 13
Test of databus wires - Perform TEST STEP 14

TEST TABLE

Notes for test table

• The socket designations of the VAG1598 test box are identical to the terminal designations
of the ABS control module (w/EDL) -J104- in the wiring diagram.
• If the measured values do not match the specifications, carry out the corrective actions on
the right side of the table.
• Use the VAG1594 connector kit for continuity tests (bridging).
• If measured values differ only slightly from specified values, clean sockets and connectors of
the testers and test leads (using G 000 700 04 contact spray) and repeat test. Before
replacing the relevant components, check wires and connections and also repeat resistance
measurement at component, especially for specified values under 10 Ω.

TEST STEP 1

Set measurement range:

voltage test (20 V =)

Test step VAG 1598 Test of • Test Specified Corrective

sockets requirements value action

◦ Additional work
steps

1 19 + 15 Voltage • Ignition 10.0 to 14.5 ◦ Check wire

supply to switched on. V from
control terminal 19
module via to Ground
terminal 15 (GND).

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Set measurement range:

voltage test (20 V =)
◦ Check wire
from
terminal 15
to terminal
15.

TEST STEP 2

Set measurement range:

voltage test (20 V =)

Test step VAG 1598 Test of • Test Specified Corrective action

sockets requirements value

◦ Additional work
steps

2 Voltage
16 + 17 supply of • Ignition 10.0 to ◦ Check wire
ABS switched on. 14.5 V from
hydraulic terminal 16
unit -N55- to Ground
and motor (GND).
for ABS
return flow
16 + 18 pump -V39 10.0 to ◦ Check
- via 14.5 V wiring from
terminal terminals 17
30, B+ and 18 to
B+
(terminal
30) via fuse
(60A).

TEST STEP 3

Set measurement range:

voltage test (20 V =)

Test step VAG Test of • Test Specified Corrective action

1598 requirements value
sockets
◦ Additional
work steps

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Set measurement range:

voltage test (20 V =)

3 19 + 14 Function • Ignition 0.0 to 0.5 ◦ Check wire from

of brake switched off V terminal 19 to
light • Brake pedal 10.0 to Ground (GND).
switch -F- not depressed 14.5 V ◦ Check wiring
from terminal 14
◦ Operate brake to terminal 30
pedal. via fuse (10A).
◦ Check brake
light switch -F-
◦ Adjust brake
light switch -F-,
see BRAKE
LIGHT
SWITCH -F-,
ADJUSTING

TEST STEPS 4 & 5

Set measurement range:

Resistance measurement (2 k Ω)

Test step VAG Test of • Test Specified Corrective action

1598 requirements value
sockets
◦ Additional
work steps

4 0.4 to 2.3k
4+5 Resistance • Ignition Ω ◦ Check
of right front switched off electrical
ABS wheel wiring
speed sensor between
-G45- control
(Vehicles module and
with ABS, wheel speed
ABS/EDL sensor for
and all open circuit
wheel drive and for short
with EDL) circuit to
Ground
(GND) or B+

3+5 Resistance ◦ Check

of right front harness
ABS wheel connectors.

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Set measurement range:

Resistance measurement (2 k Ω)
speed sensor ◦ Move wire
-G45- during test
(Vehicles (loose
with contact).
EDL/ASR)

5 6 + 7 (all Resistance ◦ Replace the

versions) of left front relevant ABS
ABS wheel wheel speed
speed sensor sensor if
- G47- specified
value is not
obtained and
the electrical
wiring is OK.

TEST STEPS 6 & 7

Set measurement range:

Resistance measurement (2 k Ω)

Test step VAG Test of • Test Specified Corrective action

1598 requirements value
sockets
◦ Additional
work steps

6 0.4 to 2.3k
1+3 Resistance • Ignition Ω ◦ Check
of right rear switched off electrical
ABS wheel wiring
speed sensor between
-G44- control
(Vehicles module and
with ABS, wheel speed
ABS/EDL) sensor for
open circuits
and for short
circuit to
Ground
(GND) or B+

1+2 Resistance ◦ Check

of right rear harness
ABS wheel connectors.
speed sensor

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Set measurement range:

Resistance measurement (2 k Ω)
-G44- ◦ Move wire
(Vehicles during test
with (loose
EDL/ASR contact).
and all
wheel drive
with EDL)

7 8 + 9 (all Resistance ◦ Replace the

versions) of left rear relevant ABS
ABS wheel wheel speed
speed sensor sensor if
- G46- specified
value is not
obtained and
the electrical
wiring is OK.

TEST STEPS 8 & 9

Set measurement range:

Voltage measurement (20 V =) in test step 8, resistance measurement (200 Ω) in test
step 9

Test VAG Test of • Test Specified Corrective

step 1598/24 requirements value action
connector
◦ Additional work
steps

8 -
Voltage Connect VAG1526 ◦ Check wire
supply for multimeter to T16(1) from T16/4
VAG1551, using VAG1594 to Ground
harness connector test kit (GND).
connector ◦ Check wire
T16 from
T16/16 to
terminal 30
via S12.

Terminal 4 - Ground 10.0 to 14.5

(GND) V
Terminal 16 - B+

9 - Resistance of • Ignition max: 1.5 Ω ◦ Check wire

the K-wire switched off from

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Set measurement range:

Voltage measurement (20 V =) in test step 8, resistance measurement (200 Ω) in test
step 9

for On Board ◦ Using the terminal

Diagnostic VAG1594 T16/7 to
(OBD), connector test terminal
harness kit, connect 11.
connector socket 11 of the
T16 VAG1598 test
box and terminal
7 of the T16
harness
connector to the
VAG1526
multimeter.

(1) See MULTI-PIN HARNESS CONNECTOR WITH TERMINAL ASSIGNMENTS,

Terminal assignment of diagnostic connector

TEST STEP 10 (1 OF 3)

Function test: ABS warning light -K47-

Test step VAG Test of • Test requirements Specified Corrective

1598 value action
sockets ◦ Additional work
steps

10 - Function of • DTC memory

ABS checked and no
warning DTC present in
light -K47-. DTC memory of
ABS control
module -J104-.
• Ignition switched
off
• Multi-pin
connector
connected to ABS
control module -
J104- and retainer
catch engaged.

Test step 10: Continued in next table.

TEST STEP 10 (2 OF 3)

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Function test: ABS warning light -K47-

Test step VAG Test of • Test Specified Corrective action

1598 requirements value
sockets
◦ Additional
work steps

10 - Function ◦ Switch on ABS • If ABS warning

Continuation: of ABS ignition warning lamp does not
warning light - light up:
light - K47- ◦ Check
K47-. lights up vehicle
for two voltage and
(2) wire from
seconds terminal 21
and then of ABS
goes out. control
module -
J104- to
instrument
cluster for
short
circuit to
Ground
(GND).
• The ABS
warning lamp
does not switch
off after 2
seconds.

◦ After 3 seconds,
the warning light
for brake system
-K118- will light
up.
◦ Check wire from
terminal 21 of
ABS control
module - J104- to
instrument
cluster for short
circuit to B+ and
open circuit.

Test step 10: Continued in next table.

TEST STEP 10 (3 OF 3)

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Function test: ABS warning light -K47-

Test step VAG Test of • Test Specified Corrective action

1598 requirements value
sockets
◦ Additional
work steps

10 - Function ◦ Switch on ABS • If the vehicle

Continuation: of ABS ignition warning voltage and
warning light -K47 the wiring
light -K47 - lights up from terminal
-. for two 21 of ABS
(2) control
seconds module -J104
and then - to the
goes out. instrument
cluster are
OK: The
LED lights or
warning
lamps are
faulty.

◦ Malfunction
in instrument
cluster

See
Instrument
cluster .

TEST STEP 11

Function test: Warning light for brake system -K118-

Test VAG Test of • Test Specified Corrective action

step 1598 requirements value
sockets
◦ Additional work
steps

11 - Function • Brake fluid level Warning ◦ Check warning

of is OK. light for contact for
warning • Ignition brake brake fluid.
light for switched off system -
brake K118- ◦ Check wire
lights up from terminal

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system - • Multi-pin for two -2- T32a/29

K118- connector seconds (instrument
connected to and then cluster) to
ABS control goes out warning contact
module - J104- again. for brake fluid
and retainer for short circuit
catch engaged. to Ground
(GND).
◦ Switch on ◦ Malfunction in
ignition. instrument
cluster.

TEST STEP 12 (1 OF 2)

Function test: Traction control indicator light -K86- (only installed in vehicles with
ASR).

Test step VAG 1598 Test of • Test requirements Specified Corrective

sockets value action
◦ Additional work
steps

12 - Function of • DTC memory

traction checked and no
control DTC present in
indicator DTC memory of
light - K86- ABS control
module -J104-.
• Ignition switched
off
• Multi-pin
connector
connected to ABS
control module -
J104- and retainer
catch engaged.

Test step 12: Continued in next table.

TEST STEP 12 (2 OF 2)

Function test: Traction control indicator light -K86- (only installed in vehicles with
ASR).

Test step VAG Test of • Test Specified Corrective action

1598 requirements value
sockets

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◦ Additional
work steps

12 - Function ◦ Switch on Traction • If traction control

Continuation: of ignition control (ASR) indicator
traction indicator lamp does not
control light - light up:
indicator K86- ◦ Check
light - comes on vehicle
K86- for two voltage and
(2) wire from
seconds terminal 20
and then of ABS
goes out. control
module -
J104- to
instrument
cluster for
open circuit
and short
circuit to
B+.
• If traction control
(ASR) indicator
lamp remains
constantly lit:
◦ Check wire
from
terminal 20
of ABS
control
module -
J104- to
instrument
cluster for
short
circuit to
Ground
(GND).

=>Electrical
Wiring
Diagrams,
Troubleshooting
& Component
Locations

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• If the vehicle
voltage and the
wiring from
terminal 20 of
ABS control
module -J104- to
the instrument
cluster are OK:
The LED lights
or warning lamps
are faulty.

See appropriate
Instrument
cluster .

TEST STEP 13 (1 OF 2)

Function test: Traction control (ASR) button (Only for vehicles with ASR)

Test step VAG Test of • Test Specified Corrective action

1598 requirements value
sockets
◦ Additional
work steps

13 - Function • Switch ignition

of traction off.
control • Function of
button traction control
indicator light -
K86- was
already
checked in step
8.
• Multi-pin
connector
connected to
ABS control
module -J104-
and retainer
catch engaged.

◦ Switch on
ignition

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◦ Press traction Traction ◦ Switch off

control button control ignition.
indicator ◦ Detach multi-
light - K86 pin connector
- lights up from ABS
control module
-J104- and
remove.

◦ Press traction Traction ◦ Connect

control button control VAG1598 test
again indicator box using
light - K86 VAG1598/27
- goes out. adapter.

Test step 13: Continued in next table.

TEST STEP 13 (2 OF 2)

Function test: Traction control (ASR) button (Only for vehicles with ASR)

Test step VAG Test of • Test Specified Corrective action

1598 requirements value
sockets
◦ Additional
work steps

19 + 31 Function
13 of • Ignition
traction switched on.
control
Continuation: button
◦ Traction 0.0 to 0.5
control button V
not pressed

◦ Traction 10.0 to ◦ Check wire

control button 14.5 V from terminal
pressed 19 to Ground
(GND).
◦ Check wire
from terminal
31 to traction
control button,
terminal 6.
◦ Check voltage
supply from

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terminal 5 of
traction
control button
to terminal 15.
◦ If no
malfunctions
can be found
using the
procedures in
these steps,
replace the
traction
control button.

TEST STEP 14

Set measurement range:

Resistance measurement (200 Ω/20 M Ω)

Test step VAG Test of • Test Specified Corrective action

1598 requirements value
sockets
◦ Additional
work steps

14 29 Databus
or wires • Ignition
30 switched off
• Set measuring
range to 200 Ω

◦ Disconnect
multi-pin
connectors
from the
control
modules that
are connected
vie a databus
wire.

◦ Check databus max: 1.5 Ω ◦ Check wire

wires for open routing
circuit. according to
wiring
diagram

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• Set measuring INFINITY ◦ Repair wire

range to 20 MΩ Ω connections
according to
◦ Check wires for wiring
short circuit to diagram.
B+ or Ground
(GND). See

BRAKE LIGHT SWITCH -F-, ADJUSTING

◦ Remove storage compartment on driver's side.

Mounting bracket with internal thread for mounting brake light switch.

1. Brake light switch

2. Hex-nut, M12 1.5
3. Brake pedal

NOTE: A spring washer (not visible in illustration) is installed between nut -

2- and mounting bracket.

Before adjusting brake light switch, check whether brake pedal is in end position (released
position).

◦ Rotate brake light switch in or out (as necessary) to obtain dimension -A- = 0.1 to 0.5 mm.
◦ Tighten nut -2- to 4.5 Nm.
◦ Install storage compartment on driver's side.
◦ Operate brake pedal.

Both brake lights light up.

◦ Remove foot from brake pedal.

Both brake lights must not light up.

Fig. 109: Mounting Bracket With Internal Thread For Mounting Brake Light Switch
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Mounting bracket with clip for mounting brake light switch.

1. Mounting bracket for pedal assembly

2. Clip
3. Brake light switch -F-

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BRAKE SYSTEM - OBD -1999 Volkswagen Passat GLS Page 69 of 72

NOTE: In order to assure sufficiently secure fitting, brake light switch

must not be installed more than once.

4. Clutch vacuum vent valve switch -F36-

Mounting procedure resembles procedure for brake light switch -F-

Installing brake light switch

• Clip integrated in mounting bracket

• Brake pedal not depressed

◦ Guide the switch -3- into the mounted clip -2-.

◦ Then press it in far enough that the plunger is resting at brake pedal.

Fig. 110: Mounting Bracket With Clip For Mounting Brake Light Switch
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Checking adjustment after installation

1. Brake pedal
2. Mounting bracket
3. Brake light switch -F-

Adjustment dimension a = max. 0.7 mm

Fig. 111: Identifying Brake Light Switch Adjustment Dimension (1 Of 2)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Adjustment dimension b = max. 0.7 mm

Fig. 112: Identifying Brake Light Switch Adjustment Dimension (2 Of 2)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

One of these adjustment dimensions MUST be obtained.

◦ Check adjustment dimension a or b and correct the adjustment if necessary by rotating the
brake light switch inward or outward.

After adjusting brake light switch, check whether brake pedal is in end position (released
position).

Checking function of brake light switch -F-

◦ Operate brake pedal.

Brake lights light up.

◦ Remove foot from brake pedal.

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BRAKE SYSTEM - OBD -1999 Volkswagen Passat GLS Page 70 of 72

Brake lights must not light up.

BRAKE LIGHT SWITCH -F- AND BRAKE PEDAL SWITCH -F47-, ADJUSTING

◦ Remove storage compartment on driver's side.

Mounting bracket with internal thread for mounting brake light switch.

1. Brake light switch

2. Hex-nut, M12 1.5
3. Brake pedal

NOTE: A spring washer (not visible in illustration) is installed between nut -

2- and mounting bracket.

Before adjusting brake light switch, check whether brake pedal is in end position (released
position).

• Rotate brake light switch in or out (as necessary) to obtain dimension -A- = 0.1 to 0.5 mm.
• Tighten nut -2- to 4.5 Nm.
• Install storage compartment on driver's side.
• Operate brake pedal.

See Both brake lights light up.

• Remove foot from brake pedal.

See Both brake lights must not light up.

Fig. 113: Mounting Bracket With Internal Thread For Mounting Brake Light Switch
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Mounting bracket with clip for mounting brake light switch.

1. Mounting bracket for pedal assembly

2. Clip
3. Brake light switch -F- with brake pedal switch -F47-

NOTE: In order to assure sufficiently secure fitting, brake light switch

must not be installed more than once.

4. Clutch vacuum vent valve switch -F36-

Mounting procedure resembles procedure for brake light switch -F-

Installing brake light switch

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BRAKE SYSTEM - OBD -1999 Volkswagen Passat GLS Page 71 of 72

• Clip integrated in mounting bracket

• Brake pedal not depressed

◦ Guide the switch -3- into the mounted clip -2-.

◦ Then press it in far enough that the plunger is resting at brake pedal.

Fig. 114: Mounting Bracket With Clip For Mounting Brake Light Switch
Courtesy of VOLKSWAGEN OF AMERICA, INC.

Checking adjustment after installation

1. Brake pedal
2. Mounting bracket
3. Brake light switch -F- with brake pedal switch -F47-

Adjustment dimension a = max. 0.7 mm

Fig. 115: Identifying Brake Light Switch Adjustment Dimension (1 Of 2)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Adjustment dimension b = max. 0.7 mm

Fig. 116: Identifying Brake Light Switch Adjustment Dimension (2 Of 2)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

One of these adjustment dimensions MUST be obtained.

◦ Check adjustment dimension a or b and correct the adjustment if necessary by rotating the
brake light switch inward or outward.

After adjusting brake light switch, check whether brake pedal is in end position (released

position).

Checking function of brake light switch -F-

◦ Operate brake pedal.

Brake lights light up.

◦ Remove foot from brake pedal.

Brake lights must not light up.

ABS/EDL/ASR WITH ESP BOSCH 5.7 ON BOARD DIAGNOSTIC

(OBD)
Information including DTC Possible Cause and Corrective Action, Electrical Testing, and
Measured Value Blocks can only be found using the VAS 5051 (factory diagnostic tester). To
access this information through Guided Fault Finding press the "Go to" button, and select

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BRAKE SYSTEM - OBD -1999 Volkswagen Passat GLS Page 72 of 72

"Function/Component selection." Follow the prompts through to Suspension (Repair Group

01; 40 to 49), Brake System, 01-On Board Diagnostic (OBD) capable system Bosch 5.7."

GLOSSARY
These definitions are relevant only to the structural unit: On Board Diagnostic (OBD) for ABS.
They are not intended to be generally applicable.

ABS

Anti-lock Brake System (ABS). More information on this can be found in the appropriate self-
study programs.

Display group number, see read measuring value block

ASR

Anti-Slip Regulation.

DATA-BUS

Data transmission. Electric signals are converted in to specific forms for this (BUS). More
information on this can be found in self-study programs no. 180 and no. 186.

DATA-BUS LOW (HIGH)

The voltage used to transmit data is low (high). More information on this can be found in self-
study program no. 186.

ABS WHEEL SPEED SENSOR

Transmit speed signals to the control module.

© 2008 Mitchell Repair Information Co., LLC.

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