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Car electrical appliances e6Passenger car repair manual

Section 2SRSsystem
Component Location

System Block Diagram

System Overview

Diagnostic Process

Fault code list

Airbag System Repair Safety Rules

Terminal Diagnosis

Comprehensive diagnostic process

Special tools

Disassembly

Scrapping points

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1. Component Location

PAB

DAB

SRS ECU

PABswitch Clock spring

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2. System Block Diagram

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3. System Overview

Automobile safety is divided into active safety systems and passive safety systems. Active safety refers to the ability to detect danger in advance, such as windshield

Field of vision, lighting system, reflectors, etc.; the ability to avoid danger in advance, such as steering system, braking system, drive anti-skid, stable driving

Passive safety refers to avoiding or reducing injuries to passengers, such as seat belts, airbags, etc.

Passive, inflatable, auxiliary protection system, referred to asSRS.

Vehicles equipped with this system can quickly beSRS-AIR-BAG”Signs

to identify.

The driver's airbag logo is molded on the decorative cover in the middle of the steering wheel,

while the passenger airbag logo is molded on the instrument panel above the glove box. Vehicles

equipped with airbag systems can also be identified by the airbag malfunction indicator light in the

instrument cluster (as shown on the left).ONAs a system self-check, the airbag malfunction indicator

light of the instrument cluster lights up for about5seconds.

The airbag system consists of the following main components:

A：Airbag Electronic Control Unit

B:SRSWarning lights

C：Seat belt warning sensor

D：Driver airbag(DAB)
E：Front passenger airbag(PAB)

F：Clock Spring(SRS CS)

G: Front collision sensor (2indivual)

H: Side impact sensor (2indivual)

I:PABswitch
The airbag electronic control unit is installed on the central axis of the car, below the center console.

The battery voltage is too low or the power is disconnected, the airbag electronic control unit can still work continuously100msabove.

Driver airbag (DAB)Installed in the center cover of the steering wheel, cannot be disassembled.DABIncluding gas generator, air bag, trim

Covers and brackets and other accessories.DABThe function is to receive the ignition signal from the airbag electronic control unit and ignite the gas generator.

A large amount of gas is generated to inflate the airbags, forming an air cushion to protect the occupants.

The clock spring is installed on the combination switch. The clock spring is composed of a spiral cable, a rotor, a housing, a wiring harness and auxiliary structural parts.

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When the steering wheel is turned, the rotor and the steering wheel rotate as a whole, and a spiral cable with sufficient length is spirally wound around the housing.

Therefore, when the rotor rotates clockwise/counterclockwise from the middle position2.5When the coil is turned, it will not affect the reliable connection of the wire.

Front passenger airbag(PAB)Installed above the glove box on the dashboard.PABThe composition and function ofDABsame.

The left front collision sensor is installed on the inside of the left longitudinal beam of the front cabin, and the right front collision sensor is installed on the inside of the right longitudinal beam of the front cabin.

The function of the sensor is to transmit the collision signal to the airbag electronic control unit, which determines whether an ignition signal is needed.

The basis.

Airbag wiring harness is used to connect the airbag electronic control unit,DAB,PAB, clock springs and instrument panel wiring harnesses, etc. Safety

The airbag wiring harness includes the airbag module drive circuit, warning light circuit, collision unlock circuit and vehicle communication bus, etc.

The function of the beam is to transmit signals between the airbag electronic control unit and the airbag module and the vehicle, and to ensure reliable communication.

The air bag circuit harness can be identified by its yellow cable or connector.

The airbag malfunction indicator light is located on the instrument cluster. When the self-diagnosis circuit of the airbag electronic control unit finds a fault, the airbag malfunction indicator light will be on.

The full airbag fault indicator light will light up to inform the driver that there is a fault in the airbag system.ON

The indicator light will light up for about5s, and then turn off.

Also assisting the airbag system are:

Steering wheel lower guard plate: The steering wheel lower guard plate is a molded structural part located behind the steering column opening cover and forms a

Integrated to protect the driver's knees from collision.

Right storage box assembly: The right storage box assembly is a structural reinforcement that provides collision protection for the driver's knees.

Right storage box assembly: The right storage box assembly is a structural reinforcement, hidden in the glove box door and integrated with the glove box door.

The knees of the row passengers are protected in a collision.

Seat belts: The main protection for passengers is still the active protection mode seat belts, which are used when the vehicle is in emergency braking, collision,

When the vehicle rolls over, it will firmly restrain the passengers in their seats, restrict the position of the driver or passengers, and avoid or reduce the possibility of the vehicle rolling over due to inertia.

To ensure that passengers get the maximum safety from the airbag system, they must wear seat safety

bring.

- Instrument cluster seat belt buckle signal: monitoring driver

Seat belts

- Child safety lock (CPLS):CPLSWhen setting,

The rear passengers cannot open the door from inside the car and must open it from outside.

This prevents children from accidentally opening the door and the door from opening suddenly during a vehicle collision.

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danger.
- Adjustable front seat headrests: Avoid collisions

Neck injury to the occupant.

- Anti-collision laminated front windshield (LSG): Avoid touching

Accidental injury caused by glass fragments during the collision.

- Anti-collision energy-absorbing body and accessories: including energy-absorbing bumper,

Cushion pads, door bumpers, etc.

Airbag system:
This airbag system is developed and produced by BYD Company.

The schematic diagram is shown on the left.

The airbag system is designed to work at an angle based on the vehicle body.
Center line front30° angle. The deployment of the airbag does not depend on the vehicle speed, but on the gravity (G)

The force is measured by the crash sensor in the airbag electronic control unit.
The microprocessor in the airbag electronic control unit2The inflation device of each airbag module sends an operating signal to cause the airbag to deploy.

The clock spring at the top of the steering column allows for the fixed steering column and driver air bag inflator (DAB) to maintain a connection

When the airbag is deployed in a frontal collision, the knee guard works together with the seat belt to

The driver and front seat passenger are restrained in place, and the knee guards also absorb and disperse the impact of the driver and front seat passenger on the dashboard.

When the airbag electronic control unit detects a problem with any airbag component or airbag system circuit,

It will fault code orDTCIt stores the information in its memory and sends it to the instrument cluster to illuminate the air bag malfunction indicator light.

Testing air bag system components, reading or clearing fault codes, and performing repairs all require a fault diagnostic tool.

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Four, Diagnostic Process

Follow this process to diagnose the problem

1 Drive the car into the repair shop

User-described fault analysis: Ask the user about the vehicle condition and the circumstances under which the fault occurred.

NEXT

2 Check battery voltage

Standard voltage value:

11V~14V

If the voltage is lower than11V, in progressNEXTPlease charge or replace the battery before.

NEXT

3 On-vehicle inspection

Instrument clusterSRSFault indicator light circuit self-diagnosis:

Turn the power level up toONFile, enterSRSSystem self-check.

Observe whether the fault indicator light turns on and off.

result conduct

Bright5sAfter extinguishing OK
Keep bright NG
Sometimes on, sometimes off, evenLOCKThe gear is also bright Enter the lighting system inspection

OK

System normal

NG

3 Diagnosis with fault diagnosis instrument

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Connect the fault diagnosis instrument to the fault diagnosis interface

Follow the prompts on the diagnostic tool to read the fault code (DTC）

result conduct

Fault code output A

No fault code output B

Skip to step 5

4 Check the fault diagnosis code list to enter the comprehensive diagnosis process and repair the corresponding fault point

NEXT

5 Direct access to comprehensive diagnostic workflow

NEXT

7 Finish

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5. Fault code list

1.Diagnostic Trouble Codes

DTC Fault description

B1600-00 Driver front airbag not connected

B160A-00 The resistance of the driver's front airbag is0

B1610-00 Front passenger front airbag not connected

B161A-00 The resistance of the front passenger airbag is0

B1654-00 Left front collision sensor not connected

B1655-00 Left front collision sensor short circuit to ground

B165D-00 Right front collision sensor not connected

B165E-00 Right front collision sensor short circuit to ground

B1693-00 Bad ground connection

B1666-00 Left side impact sensor not connected

B1667-00 Left side collision sensor short circuit to ground

B166F-00 Right side impact sensor not connected

B1670-00 Right side impact sensor short circuit to ground

B1694-00 Power supply voltage is too low

B1695-00 Power supply voltage is too high

U1330-00 The received vehicle speed signal is out of range

U1332-00 CANSpeed fault

2.Fault Symptom Table

Fault symptoms Fault scope

1. Insurance

The whole system doesn't work 2. AirbagsECU

3. Wiring

1. PABswitch
PABSwitch failure 2. AirbagsECU
3. Wiring

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6. Terminal Diagnosis

1.examineSRS ECUTerminals

1).disconnectSRS ECU G64Connector, measure the voltage and resistance between the terminals of the connector at the wiring harness end.

Terminal number Line Color Terminal Description Test conditions Normal value

G64-1-Body R Power signal power supplyONElectricity 11-14V

G64-2- G64-13 —— Left front collision sensor Always ——
G64-3- G64-14 —— Right front collision sensor Always ——
Switch pops up Greater than1MΩ
G64-4- G64-15 —— PABswitch
Switch pressed Less than1Ω

G64-8-Body V B-CAN-LSignal Always 1.5-2.5V

G64-9-Body P B-CAN-HSignal Always 2.5-3.5V
G64-11-Body B Ground (collision unlock signal ground) Always Less than1V

G64-12-Body B Grounding Always Less than1Ω

G64-21- G64-22 G/R Front passenger airbag Always 2.0±0.4Ω

G64-23- G64-24 —— Driver airbag Always 2.0±0.4Ω

2).disconnectSRS ECU K36Connector, measure the voltage and resistance between the terminals of the connector at the wiring harness end.

Terminal number Line Color Terminal Description Test conditions Normal value

K36-17 - K36-18 —— Right side collision sensor Always ——

K36-19 - K36-20 —— Left side collision sensor Always ——
ii.Re-plugSRS ECU G64,K36Connectors, DetectionG64Board end signal output.

power supplyONElectricity,
G64-10-Body W/R Collision unlock signal output Output low level signal
Always

G64-16-Body O SRSFault light driver Self-Test Output square wave signal

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VII. Airbag system maintenance safety rules

1. Overview:

Failure to follow the correct operating procedures during air bag system maintenance may result in accidental deployment of the air bag.

Thereby causing serious accidents. In addition, if the maintenance operation is wrong, the airbag may not be deployed smoothly when it is needed.

Therefore, before maintenance, you must carefully read the following precautions and follow the correct operating procedures.

2. Notes:
● Except for the operations described in this manual, it is not allowed to use electrical testing equipment to test any circuit of the airbag system.

● Install airbagsECUWhen installing, you must ensure that it is installed in the correct direction to ensure that it works correctly.

Check for cracks, deformation or rust.

● It is prohibited to use airbag system components removed from other vehicles. When parts need to be replaced, they should be replaced with new ones.

● Disassembly and repair for reuse or other reasons is prohibitedDAB,PABand installing airbagsECUAnd other parts.

● It is prohibited toDAB,PABand airbagsECUSuch parts are placed directly in hot air or flame.

● After a minor collision, the air bag system should be inspected even if the air bag has not deployed.

● IfDAB,PABand airbagsECUIf the parts are dropped, vibrated, knocked, or the housing, bracket or connector are damaged.

If there are cracks, indentations or other damage on the connector, it should be replaced with a new one.

● Warning labels are affixed to the components of the airbag system and relevant locations in the vehicle. When operating, please pay attention to the instructions above.

● If the vehicle may be subjected to vibration during repair of other vehicle systems or components, the airbag should be removed before repair.

ECU.
● When the painting operation may be affected by overheating (93℃ or above), the airbag should beECU,DAB,PAB, Clock bomb

Remove the spring and other parts and put them away.

● During the maintenance of the airbag system, the airbag module must be loaded onto the vehicle immediately after being taken out of the transport device. If the work needs to be stopped,

The airbag module should be placed back into the transport device. Do not leave the airbag module unattended.

When inserting the capsule module, the cushioning side should face upward.

Before carrying out specific maintenance work, turn the power level up toOFFgear, and remove the negative grounding wire of the battery, and then

wait90sThe above can be repaired, otherwise, the airbag may be accidentally deployed. In addition, the removed negative electrode is insulated.

Wrap the tape for insulation, as shown in the picture

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● Before removing the battery negative grounding wire, please record the status of other systems, because

At the same time, it will cause other systemsDTCLost.

● No matter where you use electric welding on the vehicle, be sure to disconnect the airbag system before starting work to avoid accidental explosion.

● Do not use test lights, ordinary voltmeters and ohmmeters during testing. Voltmeters and ohmmeters with high impedance (small

10kΩ/V). Do notDAB,PABOr use an ohmmeter on the pretensioner, as shown in the figure

● Before and after replacing any parts, perform system self-diagnosis to comprehensively check whether the system functions normally.

● If the instrument panel is damaged after the air bag is inflated, it should be replaced.

● Airbag electronic control unit connector, clock spring connector,DABConnectors,PABThe connectors are equipped with a safety

Protection mechanism for accidental deployment of airbags.

● After the airbag system is repaired, do not rush to connect the airbag module to the circuit. Perform an electrical inspection first to confirm that there is no

Connect the airbag module after the error.

● The normal service life of airbag is10If the airbag service life is exceeded, the airbag and label must be replaced.

● Airbag inflation devices contain sodium azide and potassium nitrate, which are toxic and highly flammable.

Water or heavy metals may produce harmful irritating gases (sodium hydroxide is easily formed in humid places) or produce flammable compounds.

The air bag device contains pressurized argon gas, so do not attempt to disassemble the air bag device or damage the air bag inflation mechanism.

Do not damage or burn the airbag device, do not allow the airbag device to come into contact with electrical equipment, and do not store it in a place that exceeds93℃ environment.

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8. Comprehensive Diagnosis Process

1. The entire system does not work

1).Circuit Diagram:

2).Check steps:

1 Check Insurance

Use a multimeter to test the fuseF2/32On/Off

NG

Replacement insurance

OK

2 Check the wiring harness

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Disconnect the connectorG64,Measure the wiring harness resistance and ground voltage

Connection Terminals Line Color Measurement conditions Normal value

G64-1-G2S-1 R Always Less than1Ω

G64-11-Body B Always Less than1Ω

G64-12-Body B Always Less than1Ω

NG

Replacement of wiring harness

OK

3 Replace airbagECU

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2.PABSwitch failure
1). Circuit Diagram:

2).Check steps:

1 examinePABswitch

disconnectPABSwitch, testPABSwitch working condition

Terminals Test conditions Normal value

G64-4-G64-15 OpenPABswitch Less than1Ω

G64-4-G64-15 closurePABswitch Greater than10KΩ

NG

replacePABswitch

OK

2 Check the wiring harness

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Disconnect the connectorG64,G76,Measuring the resistance of wiring harness

Terminals Line Color condition Normal value

G64-15-G76-2 G/B Always Less than1Ω

G64-4-G76-1 O Always Less than1Ω

NG

Replacement of wiring harness

OK

3 Replace airbagECU

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3. DTC,B1694-00,B1695-00, the power supply voltage is too low or too high

1). Circuit Diagram:

2).Check steps:

1 examineDC-DCOutput voltage

Disconnect the connectorB12,TestDC-DCOutput voltage

Connection Terminals Line Color Measurement conditions Normal value

B12-Body —— ONElectricity about13.8V

NG Jump toDC-DCsystem

OK

2 examineIG1Relay

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i. RemoveIG1Relay.

ii.Give1,2Check the battery by foot3,5The feet are connected and disconnected.

Terminals condition Normal value

3-5 1,2Foot plus battery voltage Less than1Ω

3-5 1,2Feet hanging Greater than10KΩ

NG replaceIG1Relay

OK

3 Replace the power harness

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4. DTC,B1693-00, Poor ground connection

1). Circuit Diagram:

2).Check steps:

1 Check the wiring harness

i. Before checking the wiring harness, check whether the grounding point is loose and check the airbag.ECUIs the housing ground loose? First, make sure these

Click Finish and proceed to the next steps.

ii.Disconnect the connectorG64,Measure the resistance between the wiring harness end and the vehicle body ground.

Connection Terminals Line Color Measurement conditions Normal value

G64-12-Body B Always Less than1Ω

G64-11-Body B Always Less than1Ω

NG Replacement of wiring harness

OK

2 replaceECUInternal fault)

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5. DTC,B1600-00, Driver front airbag not connected

1). Circuit Diagram:

2).Check steps:

1 Check whether the driver's airbag connector is properly connected

i. Disconnect the driver's airbag connector and reconnect it (make sure the connector is properly connected)

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A The system is normal (the connector is in poor contact or not

2 Check whether the driver's airbag harness is short-circuited to the ground or the power supply (this fault will also be reported if this happens)

Disconnect the driver's airbag connector and measure the voltage and resistance of the wiring harness terminal to ground.

Measure the resistance to ground

Connection Terminals Line Color Measurement conditions Normal value

1-Body Y/B Always Greater than1MΩ

2-Body Y/R Always Greater than1MΩ

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Measure voltage to ground

Connection Terminals Line Color Measurement conditions Normal value

1-Body Y/B Always Less than1V

2-Body Y/R Always Less than1V

NG Replacement of wiring harness

OK

3 Check the driver's air bag module

i. Connecting the New Driver Airbag Module

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A Replace the airbag module with a new one

4 Check the clock spring

i. Disconnect the airbag connector and the clock spring from the airbagECUDocking connector

ii.Use a thin plastic sheet to push open the short-circuit piece of the clock connector and measure the2The resistance between the terminals

iii.Use a thin plastic sheet to push open the short-circuit piece of the docking connector and measure the corresponding connectors on both sides of the clock spring.2The current between the terminals

Resistance

Connection Terminals Normal resistance

Two terminals on either side 1MΩabove

The terminals corresponding to the connectors on both sides of the clock spring Less than1Ω

NG Replace clock spring.

OK

5 Check whether the clock spring and airbag wiring harness are well connected

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i. Connect the clock spring and airbag wiring harness

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A The system is normal (the connection is not good)

6 Check the wiring harness

i. Disconnect the airbagECUConnector, disconnect the airbag connector

ii.Use thin plastic sheet23-G64and24-G64The short-circuit piece is opened and the multimeter is used to measure23-G64With airbag2#Terminal

between,24-G64With airbag1#Terminal resistance

Connection Terminals Line Color Measurement conditions Normal value

1-24-G64 Y/B Always 1ΩWithin

2-23-G64 Y/R Always 1ΩWithin

NG Replace the wiring harness (clock spring -ECU

NG

7 Replace airbagECU

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6. DTC,B160A-00、The resistance of the driver's front airbag is0

1). Circuit Diagram:

2).Check steps:

1 examineDABIs the locking piece on the connector installed in place?

NG Press the locking plate into place

OK

2 Check the air bag circuit

disconnectDABConnector, test the continuity between the two pins at the harness end

result conduct

Conductivity A
No Continuity B

B Jump to8step

3 Check the clock spring

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i. Disconnect the airbag connector and the clock spring from the airbagECUConnect the connectors between them.

ii.Use a thin plastic sheet to push open the short-circuit piece of the clock connector and measure the2The conduction between the terminals

sex.
iii.Use a thin plastic sheet to push open the short-circuit piece of the docking connector and measure the corresponding connectors on both sides of the clock spring.2The current between the terminals

Resistance

Connection Terminals Normal resistance

Two terminals on either side No Continuity

The terminals corresponding to the connectors on both sides of the clock spring Less than1Ω

NG Replace clock spring.

OK

4 Check the airbagsECUIs the short-circuit piece between the airbag wiring harness opened?

i. Disconnect the connector between the clock spring and the airbag wiring harness.

ii.Test the continuity between the two terminals on one side of the airbag harness

result conduct

Conductivity C
No Continuity D

C Jump to10step

5 Check the connector between the airbag harness and the clock spring

i. Connect the connector between the airbag harness and the clock spring.

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination OK

The fault code still exists NG

OK Finish

NG

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6 Replace the clock spring with a new one

i. Replace the new clock spring and connect the connectors

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination OK

The fault code still exists NG

OK Finish

NG

7 Replace airbag wiring harness

8 Replace the airbag module with a new one

i. Replace the new airbag module and connect the connectors

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination OK

The fault code still exists NG

OK Finish

NG

9 Replace airbagECU

10 Check the wiring harness (check if there is an internal short circuit in the wiring harness)

Disconnect the airbag connector and the airbag harness and the clock spring connector, and measure the conductivity between the two terminals at either end.

Generality

NG: On

NG Replacement of wiring harness

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OK

11 Replace airbagECU

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7. DTC,B1610-00, Front passenger front airbag is not connected

3).Circuit Diagram:

Check steps:

1 Check whether the connector between the front passenger airbag module small wire and the airbag wiring harness is properly connected.

i. Disconnect the connector between the passenger airbag module small wire and the airbag wiring harness, reconnect it, and make sure it is connected properly.

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A The system is normal (the connector is in poor contact or not

2 Check the front passenger air bag module (with small wire)

i. Connecting the new front passenger air bag module

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

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A Replace the airbag module (with small wire)

3 Check whether the front passenger airbag wiring harness is short-circuited to the ground or the power supply (this fault will also be reported if this happens)

Disconnect the front passenger airbag connector and measure the voltage and resistance of the wiring harness end to ground.

Measure the resistance to ground

Connection Terminals Line Color Measurement conditions Normal value

Hd02-1-Body O/R Always Greater than1MΩ

Hd02-2-Body O/B Always Greater than1MΩ

Measure voltage to ground

Connection Terminals Line Color Measurement conditions Normal value

Hd02-1-Body O/R Always Less than1V

Hd02-2-Body O/B Always Less than1V

NG Replace airbag wiring harness

OK

4 Check the wiring harness

i. Use thin plastic sheet21-G64and22-G64Open the short-circuit piece and measure the connector side between the front passenger airbag module

of1-Hd02and2-Hd02The resistance between

ii.Use thin plastic sheet21-G64and22-G64Open the short-circuit piece and measure the airbagECUFront passenger airbag module

Connector between modules, front passenger air bag module side1-HD02and airbagsECUConnector harness side

22-G64The resistance between

iii.Use thin plastic sheet21-G64and22-G64Open the short-circuit piece and measure the airbagECUFront passenger airbag module

Connector between modules, front passenger air bag module side2-Hd02and airbagsECUConnector harness side21-G64

The resistance between

Connection Terminals Line Color Measurement conditions Normal value

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Hd02-1-Hd02-2 —— Always Greater than1MΩ

Hd02-1-22-G64 G/B Always Less than1Ω

Hd02-2-21-G64 G/R Always Less than1Ω

NG

Replace the corresponding wiring harness or connector

OK

5 Check the airbagsECU

i. Connecting the new airbagECU

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A Replace airbagECU

6 Replace the airbag harness (the airbag harness causes poor docking)

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8. DTC,B161A-00、The resistance of the front passenger airbag is0

1). Circuit Diagram:

2).Check steps:

1 examinePABIs the locking piece on the connector installed in place?

NG Press the locking plate into place

OK

2 Check whether the connector between the front passenger airbag module small wire and the airbag wiring harness is properly connected.

i. Disconnect the connector between the passenger airbag module small wire and the airbag wiring harness, reconnect it, and make sure it is connected properly.

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A The system is normal (the connector is in poor contact or not

3 Check the front passenger air bag module

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i. Replace the new airbag module and connect the connectors

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination OK

The fault code still exists NG

OK Finish

NG

4 Check the front passenger air bag circuit

Disconnect the connector between the front passenger airbag module small wire and the airbag wiring harness, and test the airbag.ECUSide harness end two

Continuity between pins

result conduct

Conductivity A
No Continuity B

B Replace airbagECU

5 Check the airbagsECU

i. Connecting the new airbagECU

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A Replace the airbag with a new oneECU

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6 Replacement of wiring harness

9. DTC,B1654-00, Left front collision sensor not connected

1). Circuit Diagram:

2).Check steps:

1 Check whether the left front collision sensor connector is properly connected

i. Disconnect the left front impact sensor connector and reconnect it (make sure it is connected properly)

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A The system is normal (the connector is in poor contact or not

2 Check left front collision sensor

i. Connect the new left front impact sensor

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

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Fault code elimination A

The fault code still exists B

A Replace the left front collision sensor

3 Check the wiring harness

i. Before the following inspection, visually check whether the wiring harness is seriously worn (the outer bellows is worn out). If so,

For safety reasons, it is recommended to replace the wiring harness with a new one

ii.Disconnect the connectors at both ends of the wiring harness and measure the resistance of the wiring harness.

Connection Terminals Measurement conditions Normal value

G64-13-B09-2 Always Less than1Ω

G64-2-B09-1 Always Less than1Ω

NG

Replace the corresponding wiring harness

OK

4 Finish

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10. DTC,B1655-00, Left front collision sensor short circuit to ground

1). Circuit Diagram:

2).Check steps:

1 Check left front collision sensor

i. Connect the new left front impact sensor

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A Replace the left front collision sensor

2 Check the wiring harness

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Disconnect the connectorG64,Measure the resistance of the wiring harness to ground.

Connection Terminals Line Color Measurement conditions Normal value

G64-2-Body —— Always 1MΩabove

G64-13-Body —— Always 1MΩabove

NG Replacement of wiring harness

3 Finish

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11. DTC,B165D-00,Right front collision sensor not connected

1). Circuit Diagram:

2).Check steps:

1 Check whether the right front collision sensor connector is properly connected

i. Disconnect the right front impact sensor connector and reconnect it (make sure it is connected properly)

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A The system is normal (the connector is in poor contact or not

2 Check the right front collision sensor

i. Connect the new right front impact sensor

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

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The fault code still exists B

A Replace the right front collision sensor

3 Check the wiring harness

i. Before the following inspection, visually check whether the wiring harness is seriously worn (the outer bellows is worn out). If so,

For safety reasons, it is recommended to replace the wiring harness with a new one

ii.Disconnect the connectors at both ends of the wiring harness and measure the resistance of the wiring harness.

Connection Terminals Measurement conditions Normal value

G64-14-B27-1 Always Less than1Ω

G64-3-B27-2 Always Less than1Ω

NG Replace the corresponding wiring harness

OK

4 Finish

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12. DTC,B1655-00, The right front collision sensor is short-circuited to the ground

1). Circuit Diagram:

2).Check steps:

1 Check the right front collision sensor

i. Connect the new right front impact sensor

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A Replace the right front collision sensor

2 Check the wiring harness

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Disconnect the connectorG64,Measure the resistance of the wiring harness to ground.

Connection Terminals Line Color Measurement conditions Normal value

G64-3-Body —— Always 1MΩabove

G64-14-Body —— Always 1MΩabove

NG Replacement of wiring harness

3 Finish

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13. DTC,B1666-00, Left collision sensor not connected

1). Circuit Diagram:

2).Check steps:

1 Check whether the left side impact sensor connector is properly connected.

i. Disconnect the left side impact sensor connector and reconnect it (make sure it is connected properly)

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Set the power level back toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A The system is normal (the connector is in poor contact or not

2 Check the left side collision sensor

i. Connect the new left side impact sensor

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B
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A Replace the left side collision sensor

3 Check the wiring harness

i. Before the following inspection, visually check whether the wiring harness is seriously worn (the outer bellows is worn out). If so,

For safety reasons, it is recommended to replace the wiring harness with a new one

ii.Disconnect the connectors at both ends of the wiring harness and measure the resistance of the wiring harness.

Connection Terminals Line Color Measurement conditions Normal value

K36-19-K13-2 B/R Always Less than1Ω

K36-20-K13-1 Br/W Always Less than1Ω

NG Replace the corresponding wiring harness

OK

4 Finish

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14. DTC,B1667-00, The left collision sensor is short-circuited to ground

1). Circuit Diagram:

2).Check steps:

1 Check the left side collision sensor

i. Connect the new left side impact sensor

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A Replace the left side collision sensor

2 Check the wiring harness

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Disconnect the connectorK36,Measure the resistance of the wiring harness to ground.

Connection Terminals Line Color Measurement conditions Normal value

K36-19-Body B/R Always 1MΩabove

K36-20-Body Br/W Always 1MΩabove

NG Replacement of wiring harness

3 Finish

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15. DTC,B166F-00, Right collision sensor not connected

1). Circuit Diagram:

2).Check steps:

1 Check whether the right side impact sensor connector is properly connected.

i. Disconnect the right side impact sensor connector and reconnect it (make sure it is connected properly)

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A The system is normal (the connector is in poor contact or not

2 Check the right side collision sensor

i. Connect the new right side impact sensor

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

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result conduct

Fault code elimination A

The fault code still exists B

A Replace the right side collision sensor

3 Check the wiring harness

i. Before the following inspection, visually check whether the wiring harness is seriously worn (the outer bellows is worn out). If so,

For safety reasons, it is recommended to replace the wiring harness with a new one

ii.Disconnect the connectors at both ends of the wiring harness and measure the resistance of the wiring harness.

Connection Terminals Line Color Measurement conditions Normal value

K36-17-M13-2 LG Always Less than1Ω

K36-18-M13-1 O Always Less than1Ω

NG Replace the corresponding wiring harness

OK

4 Finish

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16. DTC,B1670-00, The right side collision sensor is short-circuited to ground

1). Circuit Diagram:

2).Check steps:

1 Check the right side collision sensor

i. Connect the new right side impact sensor

ii.Turn the power up toONUse the diagnostic tool to clear the fault code and wait for at least20S

iii.Turn the power up toOFFfiles

iv.Turn the power up toONUse the diagnostic tool to read the fault code

result conduct

Fault code elimination A

The fault code still exists B

A Replace the right side collision sensor

2 Check the wiring harness

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Disconnect the connectorK36,Measure the resistance of the wiring harness to ground.

Connection Terminals Line Color Measurement conditions Normal value

K36-17-Body LG Always 1MΩabove

K36-18-Body O Always 1MΩabove

NG Replacement of wiring harness

3 Finish

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17.Input circuit check

1). Circuit Diagram:

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2).Check the bonding point, wiring harness or connector

Refer to System Component Inspection to prepare for the inspection.

1 Check grounding

Check if the grounding point is loose

NG

Build the grounding wire

OK

2 Check the wiring harness

i. disconnect

ii.Measuring the resistance of the ground wire harness

Connection Terminals Measurement conditions Normal value

G64-11-Body Always Less than1Ω

G64-12-Body Always Less than1Ω

ECUShell-body ground Always Less than1Ω

NG

Replace the corresponding wiring harness

OK

3 Finish

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3).Check the battery

1 Battery voltage check

i. Remove the negative ground wire from the battery and wait at least90s

ii.Refer to the system component inspection method in the Chinese section to disconnect the airbag electronic control unit connector and the sub-control unit connector.

iii.Check the battery voltage according to the method in the system component inspection

Connection Terminals Measurement conditions Normal value

G64-1-Body power supplyONElectricity 11-14V

NG

Charge or replace the battery

OK

2 Finish

4). examinePABswitch

1 examinePABswitch

i. Remove the negative ground wire from the battery and wait at least90s

ii.Refer to the Chinese method for system component inspection to disconnect the airbag electronic control unit connector

MeasurementPABResistance across the switch

Connection Terminals Measurement conditions Normal value

G64-15-G64-4 switchONfiles Less than1Ω

G64-15-G64-4 switchOFFfiles Greater than1MΩ

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NG

Replace PAB switch

OK

2 Finish

5).Check the collision sensor circuit

The inspection methods for the four sensors are the same. Here we take the left front as an example.

1 Check the collision sensor

i. Remove the negative ground wire from the battery and wait at least90s

ii.Disconnect the airbag electronic control unit connector by referring to the method in the system component inspection.

iii.Unplug each sensor connector

iv.Measure the resistance of the sensor

Connection Terminals Measurement conditions Normal value

1-2 Always 1000±10Ω

The inspection methods for the four sensors are the same. Here we take the left front as an example.

NG

Replace the corresponding sensor

OK

2 Check the wiring harness

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Measuring the resistance of the wiring harness

Connection Terminals Measurement conditions Normal value

G64-13-B09-2 Always Less than1Ω

G64-2-B09-1 Always Less than1Ω

G64-3-B27-2 Always Less than1Ω

G64-14-B27-1 Always Less than1Ω

K36-20-K13-1 Always Less than1Ω

K36-19-K13-2 Always Less than1Ω

K36-18-M13-1 Always Less than1Ω

K36-17-M13-2 Always Less than1Ω

NG

Replace the corresponding wiring harness

OK

3 Finish

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6).examineCANWire

1 examineCANWire

i. Remove the negative ground wire from the battery and wait at least90s

ii.Disconnect the airbag electronic control unit connector by referring to the method in the system component inspection.

iii.Connect the negative grounding wire of the battery and turn the power level up toONElectricity

iv.TestG64-8,G64-9Terminal voltage

Connection Terminals Measurement conditions Normal value

G64-8-Body Always 1.5~2.5V

G64-9-Body Always 2.5~3.5V

NG

Replace the corresponding wiring harness

OK

3 Finish

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18.Output circuit inspection

1). Circuit Diagram:

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2).Driver airbag circuit inspection

1 Check the driver's air bag circuit

i. Remove the negative ground wire from the battery and wait at least90s

ii.Refer to the method for disconnecting during system component inspectionDABConnectors and airbag electronic control units

iii.Check the driver airbag circuit by referring to the method in the system component inspection

result conduct

Fault code elimination A

The fault code still exists B

B Enter4

2 Check the airbag electronic control unit

Refer to the method in the system component inspection to check the airbag electronic control unit.

result conduct

Fault code elimination A

The fault code still exists B

A Replace the airbag electronic control unit

3 Check the driver's air bag module (refer to System Component Inspection)

Remove the negative ground wire from the battery and wait at least90s

Refer to the method for disconnecting during system component inspectionDABConnectors and airbag ECU connectors

Refer to the inspection method in the system components to inspect the driver airbag module.

result conduct

Fault code elimination A

The fault code still exists B

A Replace the driver air bag module.

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4 Check the clock spring (refer to System Component Inspection)

Connection Terminals Normal resistance

Two terminals on either side 1MΩabove

The terminals corresponding to the connectors on both sides of the clock spring Less than1Ω

NG Replace clock spring.

OK

6 Check the wiring harness between the airbag ECU and the clock spring

Connection Terminals Normal resistance

G64-23-G30-1 Less than1Ω

G64-24-G30-2 Less than1Ω

NG Repair or replace wiring harness

OK

7 The originally faulty component is now normal. To further identify the fault, a simulation method should be used for inspection.

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3).Front passenger air bag circuit inspection

1 Check the front passenger air bag circuit

i. Remove the negative ground wire from the battery and wait at least90s

ii.Check method disconnection in reference system componentsPABConnectors and airbag ECU connectors

iii.Refer to the inspection method in the system components to check the front passenger airbag circuit.

Repair or replace the airbag electronic control unit

NG Cable between the front passenger air bag module

Bundle or Connector

OK

2 Check the airbag electronic control unit

Check the airbag electronic control unit (refer to system component inspection)

result conduct

Fault code elimination A

The fault code still exists B

A Replacement of airbag electronic control unit

3 Check the front passenger air bag module

i. Remove the negative ground wire from the battery and wait at least90s

ii.Refer to the method in the system component inspection to inspect the airbag module.

NG Replace the front passenger air bag module

OK

4 Finish

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4).Other output signal harness inspection

1 Check the wiring harness

i. Remove the negative ground wire from the battery and wait at least90s

ii.Refer to the Chinese method for system component inspection to disconnect the airbag electronic control unit connector

Measure the resistance of the wiring harness.

Connection Terminals Measurement conditions Normal value

G64-10-G2P-16 Always Less than1Ω

G64-10-K33-3 Always Less than1Ω

NG Replace the corresponding wiring harness

OK

3 Finish

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IX. Special tools

Tool Name Appearance effect

Airbag module bracket Fixed air bag module

Expand ToolSST DAB,PAB,SABScrap treatment

Detonation tools andDAB,PAB,SABof

Detonation wiring Electrical Connections

Read and clear airbag system faults

Fault diagnosis instrument
In addition to the operation

Steering wheel puller Steering wheel removal

Maintenance rubber gloves, eye protection

Maintenance personnel wearing protective tools
mirror

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10. Disassembly and Installation

1.Preparation before disassembly

Before disassembly and installation, be sure to do the following preparations and strictly abide by the safety rules.

i. Power level back toOFFfiles.

ii.Disconnect the battery and wait at least90S.

Warning signs:

Before removing or installing the airbag system, please pay attention to the warning signs (yellow signs) of the airbag system in the car. ,
Operate according to the conditions recorded on the mark. In addition, if the mark is damaged or dirty, it should be replaced with a new one.

●DABsurface: ●PABModules:

●DABInside the module: ● AirbagECU:

● Driver sun visor:

● Clock spring:

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2.Removal and installation of airbag electronic control unit

Notice:Do not open the housing of the airbag electronic control unit unless absolutely necessary. If you touch the terminals of the integrated circuit,

The integrated circuit may be damaged.

1).Key points for disassembling the airbag electronic control unit

i. Unplug the connector

Notice:The connector should be unplugged with the airbag electronic control unit installed.

ii.Remove the screws with an Allen wrench and remove the airbag electronic control unit.

2).Key points for installing the airbag electronic control unit

i. Use an Allen wrench to install the airbag electronic control unit in the correct direction.

Notice:Ensure that the tightening torque meets the requirements (torque requirements:20N.m).

ii.Connect the wiring harness connector.

iii.Post-installation inspection

Notice:After installation, shake the airbag electronic control unit to check for any looseness.

3.Driver airbag module (DAB) and removal and installation of clock springs

Notice:When operating a deployed airbag, use maintenance goggles and rubber gloves.

1). Key points for disassembly and assembly of driver's airbag module and clock spring

hint:The installation and removal procedures are reversed.

twenty two． Disconnect the negative battery terminal

Notice:After removing the terminals, wait at least90sBefore you can start the operation

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3). 3．RemoveDABAssembly

i. Put the front wheels in the forward position (driving straight ahead)

ii.Remove the two steering wheel decorative covers on the left and right sides of the steering wheel.

iii.Use a hexagon socket wrench to loosen the two screws on the left and right.

iv.Pull the driver's air bag module away from the steering wheel and unplug the air bag connector.

Notice:When removing the driver airbag module, be careful not to pull on the airbag wiring harness. When storing the airbag module,

Keep the decorative cover facing upwards and do not disassemble the driver's airbag module.

4).Remove the steering wheel

i. Unplug the horn connector and remove the mounting nut in the center of the steering wheel.

ii.Pull out the steering wheel with a special tool (steering wheel puller)

Notice:Make alignment marks on the steering wheel and steering shaft spindle.

5).Remove the upper and lower steering column covers (i.e. combination switch covers)

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6).Remove the clock spring

i. Disconnect the harness connector from the clock spring without damaging the harness

ii.separate3Remove the clock spring

Notice:Do not disassemble the clock spring assembly and do not add lubricating oil to it.

7).When installing the clock spring, make sure that:

i. Remove the locking pin first (when replacing a new one)

ii.Confirm the middle position of the clock spring. Check whether the front wheel is in a straight-ahead state. Turn the clock spring counterclockwise by hand until the

until it is tight, then turn clockwise2.5~3Align the marks and lock the clock spring with the clock spring locking plate.

8).Steering wheel installation confirmation

Align the marks on the steering wheel and the steering shaft. If it is a new steering wheel, pay attention to adjust the direction and install the steering wheel mounting bolts.

When the torque is guaranteed:50N.m.

9).Driver airbag module (DAB)confirm

i. Install the driver air bag module (DAB)When installing the screws, ensure the torque:10N.m

ii.Post-installation inspection

After installation, gently turn the steering wheel left or right to check if there is any abnormality or noise.

10).Front passenger airbag module (PAB) disassembly and installation

Notice:When operating a deployed airbag, use maintenance goggles and rubber gloves.

11).Key points for removing the front passenger airbag module

hint:The installation and removal procedures are reversed.

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i. 1.Remove the right glove box assembly from the dashboard, reach in and unplug the airbag connector

Notice:When handling the air bag connector, be extremely careful not to damage the air bag wiring harness.

2.Removing the front passenger airbag module

Use an Allen wrench to remove the two bolts that secure the front passenger airbag module to the bracket, loosen each clip, and remove the airbag from the dashboard.

Take out the passenger airbag module

Notice:Disassembly of the front passenger air bag module is prohibited.

12).Post-installation inspection

After installation, visually check whether the surface of the dashboard is flat and the gap is normal.

Notice:After all components of the airbag system are installed, they should be checked according to the self-diagnosis requirements of the warning light circuit.

If the fault occurs, it should be eliminated according to the previous troubleshooting methods.

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