February 2006

Volume 8, No.2

A Monthly Publication for GM Dealership Service Professionals

The GE-47716 Coolant Refill System

(also referred to as the Vac-n-Fill) is an
essential tool, shipped to dealers in
November 2004. This tool is used when
refilling a cooling system that has been
drained.
In many cases, simply pouring fresh
coolant into the cooling system allows a
certain amount of trapped air to remain in
the cooling system. Typically, thermal-
cycling the engine (warm-up and cool-
down) helps purge this air. But on some
engines, there are remote pockets where
air may be trapped. Using the Vac-n-Fill
removes all air from the cooling system.
A venturi assembly in the tool uses
high-pressure shop air to create a vacu-
um in the vacuum tank on the top of the
tool. The vacuum is then applied to the
cooling system. Once the vacuum is
maximized (indicated by the built-in
gauge), a release valve allows the vacu-
um to draw fresh coolant from the tool’s
reservoir into the system. One or two
repetitions of this process will usually fill
the cooling system and will purge all air.
continued on page 2

Techline News

CANdi & becomes increasingly important to

equip each Tech 2 with a CANdi Contents
Tech 2 – Module to take full advantage of the
service data on the vehicle. Vac-N-Fill (GE-47716) . . . . . . . . . . . . . .1

A Necessary According to a recent analysis, the

typical GM dealership has only one
CANdi & Tech 2 —
A Necessary Combination . . . . . . . . .
GM Vehicle Care
. . .1

Combination CANdi module for every three Tech 2s

they own. This is not an effective ratio
Odor Eliminator Instructions . . . . . . .
Electrical Terminal Tool Kits . . . . . . . .
.
.
.
.
.2
.3
Integral Connector Position Assurance . . .3
for GM LAN of CANdi Modules to Tech 2s for effi-
cient fix-it-right-the-first-time customer
Remote Vehicle Start Kit Followup . . .
2005-06 Secondary
. . .3

Diagnostics service. Each Tech 2 should be

equipped with its own CANdi Module.
Air Injection Systems . . . . . . . . . . . .
SIR System Disabling
. . .4

and Enabling — New . . . . . . . . . . . . . . .5

Did you know that at least one con- With some programming events tak- SES Light On (AFM Engine) . . . . . . . . . . .5
troller on every 2006 General Motors ing as long as an hour to complete, Trailer Wiring Harness ID . . . . . . . . . . . .6
vehicle uses Controller Area Network the time waiting for a CANdi Module Blue Coolant . . . . . . . . . . . . . . . . . . . . .6
is lost money. Headlamp Washers Inoperative . . . . . . . .6
(CAN) communication protocols? This Poor Heater Performance . . . . . . . . . . . .6
is the method used by controllers on Check out the first-quarter specials Trailer Light Bulbs . . . . . . . . . . . . . . . . .6
GM vehicles to talk to one another. It’s from GM Tools. There are specials on Headlamp Ballast . . . . . . . . . . . . . . . . . .7
also called GM LAN. Tech 2 packages and a 15% discount Headlamp Fog . . . . . . . . . . . . . . . . . . . .7
Axle Vent Hose Fluid Leak . . . . . . . . . . . .7
Your Tech 2 requires an interface on all accessories, including the CANdi
Whine Noise from Speakers . . . . . . . . . .7
called the CANdi Module to communi- Module. Contact SPX/Kent-Moore at Brake Cooling Ducts . . . . . . . . . . . . . . . .7
cate properly with GM LAN con- 1.800.GMTOOLS for details. Fix It Right the First Time . . . . . . . . . . . .8
trollers. CANdi stands for Controller TIP: Dealers outside of the US Know How Broadcasts for March . . . . . .8
Area Network Diagnostic Interface. As should call for pricing and details.
more vehicles use GM LAN, it
– Thanks to Dan Doss Service and Parts Operations

1
Vac-N-Fill (GE-47716) – from page 1

TIP: For more information on operating 5. Open the valve and drain the solu-
the GE-47716 Coolant Refill System, see tion.
the GM Tool Organization DVD/Software 6. Repeat procedure with clean water
(J-43921-G v8.0). GM TechLink is a monthly magazine
to remove any remaining soap for all GM retail technicians and
Vacuum Tank Cleaning residue. service consultants providing timely
Procedure – Thanks to Russ Dobson and information to help increase knowl-
IMPORTANT: Do not disassemble Kevin Willcock edge about GM products and
the vacuum tank. Doing so will improve the performance of the
void the warranty. Resealing the service department.
vacuum tank in the field is very Manager, Product Readiness:
difficult and should not be
attempted. R. M. (Bob) Savo
GM Service and Parts Operations
/ Bob.Savo@GM.com
If the vacuum tank on the GE-
47716 becomes excessively dirty
and cleaning needs to be con- Publisher & Editor:
ducted, follow this procedure:
1. Remove all hoses from the Mark Stesney
GM Service and Parts Operations
/ Mark.Stesney@GM.com
tank.
2. Open the drain valve and
drain any fluid from inside Technical Editor:
the tank.
Jim Horner
/ Jim_Horner@ADP.com
3. With drain valve still open,
pour in a solution of water
and mild soap. 1-248-816-3641
4. Close the drain valve and Production Manager:
agitate the tank.
Vacuum Tank Marie Meredith
Desktop Publishing:
Supreme Graphics, Inc.
/ supremeinc@supremeg.com
3
GM Vehicle Care Odor
FAX number:
Eliminator Application 1-248-649-5465
Instructions Write to: *
GM offers an odorless, water based, non-toxic odor TechLink
eliminator (TechLink, March 2002). It safely and perma- PO Box 500

:
nently eliminates odors from all surfaces and HVAC Troy, MI 48007-0500
systems. The 16 oz. container is available under GM GM TechLink on the Web:
part number 12378554 (88901678 in Canada).
Instructions are included with the product. For carpet GM DealerWorld
and upholstery, after checking for color fastness, you
can spray the product directly onto the odor source, General Motors service tips are
brush into the fabric to ensure penetration, and blot intended for use by professional tech-
nicians, not a "do-it-yourselfer." They
excess moisture. For ventilation systems, spray directly are written to inform those techni-
into the cowl intake. At a cool setting, run the fan on cians of conditions that may occur on
high for several minutes. Then set the AC on max and some vehicles, or to provide informa-
run the fan for several more minutes. You can also add the product to the soap tion that could assist in the proper
reservoir on shampoo equipment. service of a vehicle. Properly trained
technicians have the equipment, tools,
TIP: If you misplace the instruction safety instructions and know-how to
sheets that come with the product, do a job properly and safely. If a con-
please do not call the manufacturer. All dition is described, do not assume
five pages of instructions for use are that the bulletin applies to your vehi-
now available in the Reference Guide cle or that your vehicle will have that
on the TechLink website: condition. See a General Motors deal-
er servicing your brand of General
– Interior treatment Motors vehicle for information on
– Dilution ratios whether your vehicle may benefit from
the information.
– Water damage, musty, mildew odor
Inclusion in this publication is not nec-
– Trouble shooting for water essarily an endorsement of the indi-
damaged vehicles vidual or the company.
– Used vehicle odor neutralization Copyright© 2006 General Motors Corporation
– Thanks to Alan Srodawa All rights reserved.

2
Electrical Terminal J-35616-250
The second package is a Male Test Probe Refill Kit. It consists
Tool Kits of one pair each of these Male Test Probes:
– J-35616-2A – J-35616-35
SPX/Kent-Moore is is now offering two tool packages to pro- – J-35616-4A – J-35616-64B
vide technicians with the latest terminal testing and repair tools, – J-35616-6
at a reduced price. These test probes are used to properly test the five most
The .64 terminals have become commonplace within GM popular female terminals used in GM vehicles, without damage
wiring harnesses, and their small size makes them susceptible to the terminals being tested.
to damage if the incorrect release tool or test probes are used.
Special Prices
These tool packages were developed to address concerns
that the tools may not be readily available in dealerships due to Tool Sale Price* Regular Price*
the tools’ small size and high demand. J-35616-1
.64 Service Kit $30.81 $44.01
J-35616-1
J-35616-250
The first package is a .64 Service Kit and it consists of: Male Test Probe
– one J-38125-21 (15381651-1) Delphi .64 Terminal Release Refill Kit $57.30 $81.86
Tool
* Prices quoted are US dollars; dealers outside of the US should call for pricing.
– a pair of J-35616-64B Male .64 Test Probes.
The special prices will be available February 1 through
The release tool is required to remove the Delphi .64 terminal
August 1, 2006. Promotional materials will be sent electronically
from the connector body.
to all dealers and posted in the VSSM library. For additional
The male .64 test probes are used to properly test female .64 information, please contact SPX/Kent-Moore at 1.800.GM
terminals without damaging the terminal. TOOLS (800.468.6657) or visit WWW.GMDE.net.
– Thanks to Greg McDonald

Integral Connector Remote Vehicle Start

Position Assurance Kit Followup
(CPA) As explained in the June 2005 TechLink, a remote vehicle start (RVS)
kit is available for dealer installation in the following 2006 vehicles:
An article in the August 2005 issue of TechLink – Chevrolet Malibu – Pontiac Grand Prix
discussed the introduction of connection systems – Pontiac G6 – Buick LaCrosse/Allure
with an integral connector position assurance (CPA).
If not operated properly, the CPA can be damaged – Buick Terraza – Chevrolet Impala
during removal of the connector, which can cause – Chevrolet Uplander – Chevrolet Monte Carlo
DTCs to be set after the CPA is pressed into place. – Pontiac Montana – Buick Lucerne
If the CPA is fully removed from the connector – Saturn Relay
housing or damaged in any way, it must be TIP: A kit will also be available for the upcoming 2007 full-size
replaced. This CPA Chevrolet and GMC utilities.
(p/n 54590003) is
available in the SIR IMPORTANT: To qualify for installation of the RVS accessory kit, the
tray of the terminal vehicle must be equipped with an automatic transmission and RPO
repair kit. AP8. While AP8 may be standard equipment on some vehicles, it must
be ordered for others.
The photos in the
article portrayed the
FCI connection sys-
tem called ABX4,
which was introduced
on the 2005 midsize
pickup trucks.
The system is also being used on these additional
vehicles:
– 2006 Impala and Monte Carlo
– 2006 Chevrolet Corvette For answers
– 2006 Buick Lucerne to questions
you may have
– 2006 Cadillac DTS about model
– 2006 mid-size utilities application,
– 2007 Buick LaCrosse/Allure VIN code, and
– 2007 full-size utilities the part numbers for the applicable installation kit and instruction sheet,
go to the TechLink website. Click on the Reference Guide tab, then
Refer to the August 2005 issue for detailed scroll down to Remote Start Kit Applications. Click to open the applica-
instructions. You may find back issues on the tion table.
TechLink website, accessible through DealerWorld.
– Thanks to Sharon Folts
– Thanks to Kirk Reinbold
3
2005-06 Secondary Air Injection (SAI) Systems
SAI System Operation The pump inlet hose is routed to the The highly robust shut-off valve opens
The Secondary Air Injection (SAI) is an air cleaner housing. This location allows reliably when commanded ON by the
emission control sub-system that normal- the engine air filter to supply clean air ECM. Conditions such as low manifold
ly operates upon initial cold or warm and eliminates water intrusion into the vacuum, high altitude, or heavy accelera-
engine start-ups. The AIR pump supplies AIR pump. tion have no adverse effects on the oper-
pressurized fresh air into the exhaust The in-rush current of the AIR pump is ation of the valve. The ECM supplies the
system to accelerate catalyst operation. approximately 120 amps. During continu- AIR pressure sensor with the following
This reduces HC and CO emission levels. ous operation, the current draw is 20 to circuits:
Early SAI systems used a large contin- 25 amps. In a high current circuit like – 5-volt reference
ually running mechanical pump driven by this, resistance as low as 2 to 3 ohms – Low reference ground
an accessory belt (a power robbing anywhere in the pump circuitry may
– A signal circuit that provides the
device) with noisy, vacuum-powered con- adversely affect pump operation.
control module with a voltage rela-
trol switching. The New Electronic tive to internal AIR pressure
The latest SAI system uses a small Shut-Off Valve changes.
maintenance-free electric motor that The AIR solenoid has the following
runs for approximately 20–30 seconds circuits:
with a whispering hum. – A voltage circuit supplied by the AIR
The AIR pump is calibrated to operate solenoid relay
when the engine start-up coolant – A ground circuit
temperature is between 41° F (5° C)
and 122° F (50° C) and the ambient air The ECM also supplies the AIR pump
temperature is between 41° F (5° C) and and AIR valve relays with separate con-
140° F (60° C). trol (ground) circuits.
TIP: To avoid damage from frozen The ECM compares measured AIR
moisture in the system, the AIR pump pressure values with predicted values to
will not run when the ambient air tem- detect faults with:
perature is below 41° F (5° C). New AIR Shut-Off Valve with – The AIR pump
Integral Solenoid and Pressure Sensor
When the engine is at operating – The AIR control solenoid valve/pres-
temperature and the catalyst is warm sure sensor assembly
enough to operate efficiently, the AIR The electronic
control shut-off – The system hoses and pipes
pump is not required. – The AIR pressure sensor and relay
valve (also
Features of the New Pressure known as the control circuits.
Based SAI system AIR control Diagnosis
solenoid
Components of the SAI system are There are 3 phases of the SAI
valve/pressure
familiar, with the exception of the new diagnostic:
sensor assembly
pressure sensor. The operation of the – Phase 1 — The ECM commands
or check valve
pressure sensor is similar to that of a both the AIR pump and AIR check
assembly)
Fuel Tank Pressure (FTP) sensor. valve relays ON.
contains:
Earlier SAI systems used the HO2S – Phase 2 — The ECM continues to
– A pressure
sensor for diagnosis and verification of AIR Shut-Off Valve command the AIR pump relay ON
sensor, for
SAI system operation. and also commands the AIR valve
monitoring
The new generation of SAI has a pres- airflow pressure relay OFF.
sure sensor built into the electronic shut- – Phase 3 — The ECM commands
– A control valve that allows pressur-
off valve, which creates a more precise both the AIR pump and AIR check
ized air from the pump to flow to
way to determine what is happening in valve relays OFF.
the exhaust manifold
the system. The Engine Control Module
(ECM) detects abnormal conditions like a – An electrical solenoid that operates The increased number of DTCs now
pump that is running continuously, or a the control valve associated with SAI will help easily diag-
shut-off valve that is stuck open. – A check valve that keeps exhaust nose and repair the fault in the system.
gases from damaging The following DTCs set
the assembly and the when an AIR system fault is
rest of the system detected:
The valve has no TIP: The P2444 diagnostic
removable parts. The code is a type A. All of the
solenoid, check valve, and others are type B, which illu-
pressure sensor are ser- minate the MIL on the sec-
viced as an assembly. ond drive trip.
A New 5-pin connector – DTC P0411 — During
Phase 1, an AIR system
AIR pump B Electronic solenoid insufficient airflow con-
C Pressure sensor dition has been detect-
Here are some additional changes D Inlet ed due to a malfunction-
to the AIR pressure based diagnostic E Outlet to exhaust ing:
system. manifold AIR Shut-Off Valve – AIR Check Valve
Components
continued on page 5

4
 2005-06 Secondary Air Injection (SAI) Systems – from page 4

– AIR pump – DTC P2440 — An AIR system 6. The AIR pressure parameter should
– AIR relay and related control circuit airflow leak has been detected increase. The difference in readings
during Phase 2. between step 3 and step 6 should
– AIR pipe or hose restriction
– DTC P2444 — An AIR pump stuck be greater than 10kPa.
or leak.
ON fault condition has been detect- If it’s less than 10kPa, review the
– DTC P0412 — An AIR valve relay ed during Phase 3. scan tool DTC information and refer
coil circuit fault has been detected. to SI for service procedures.
This diagnostic runs continuously. SAI System Verification
TIP: The SAI system diagnostic tests
– DTC P0418 — An AIR pump relay The following procedure determines if
may call for bypassing the AIR pump
coil circuit fault has been detected. the SAI system is operating as designed:
relay with a 60A fused jumper wire. The
This diagnostic runs continuously. 1. Start and idle the engine for about 2 AIR shut-off valve will remain closed,
– DTC P2430 — An AIR pressure minutes to allow the SAI diagnostic causing a deadheaded condition. This
sensor signal change fault has been to run and complete. builds an abnormal amount of heat in the
detected during Phase 1 and /or 2. The start-up coolant and ambient air pump. DO NOT operate the AIR pump
Phase 2. temperatures have to be in the spec- for more than 30 seconds under these
– DTC P2431 — An AIR pressure ified operating range. conditions.
sensor value versus the BARO sen- 3. Monitor the AIR pressure parameter TIP: When using the Tech 2 to com-
sor value fault has been detected. with a Tech 2. mand the AIR pump ON, a timer in the
This diagnostic runs continuously. 4. Command the AIR pump relay ON. ECM and Tech 2 will automatically stop
Only the AIR pump should operate. AIR pump operation. This will avoid over-
– DTC P2432 — The AIR pressure
The Tech 2 parameter will indicate heating and damaging the AIR pump
sensor signal voltage is below the
only that the AIR pump relay is com- motor.
minimum range of the sensor. This
diagnostic runs continuously. manded ON. TIP: AIR pump operation is affected
5. Command the AIR solenoid valve by system voltage. If the electrical
– DTC P2433 — The AIR pressure system is not operating properly, correct
sensor signal voltage is above the relay ON. The AIR pump should
operate and the AIR solenoid/check the condition before diagnosing the SAI
maximum range of the sensor. This system.
diagnostic runs continuously. valve should open. The Tech 2 para-
meter will indicate that both AIR – Thanks to Frank Tornambe and
relays are commanded ON. Michael Schallmo

SIR System Disabling and Enabling Procedure — New

A bulletin is being released explaining the new SIR system Future designs will eliminate certain deployment loop in-line
disabling and enabling procedure for all 2003-06 GM cars and connectors. Removing the in-line connectors makes the SIR
trucks. deployment loop even more robust.
IMPORTANT: Refer to the bulletin for details and follow the The new SIR Enabling and Disabling procedure requires only
procedure exactly. Here are some highlights only. a fuse removal and/or the negative battery cable disconnect.
Past experience, ongoing testing, and improved quality and Deployment power is available for as much as one minute
reliability of the Supplemental Inflatable Restraint (SIR) systems after disconnecting the vehicle power. Waiting one minute
enables simplification of the SIR Disabling and Enabling proce- before working on the system after disabling the SIR system
dure. Testing has shown that it is not always necessary to prevents deployment of the air bags from the reserved energy
disconnect air bag(s) in the area of repairs. supply.
The new SIR Enabling and Disabling procedure is less inva- IMPORTANT: Refer to the bulletin for details and follow the
sive (therefore eliminating potential squeak and rattle conditions procedure exactly.
that may occur from the previous procedure) and is a simpler
– Thanks to Chuck Weiseckel
and quicker approach.

SES Light On The most likely cause is that the fuel

injector connectors are crossed or incor-
Use the appropriate SI fuel injector
schematic to verify that the fuel injector
(AFM Engine) rectly installed. For example, the number
6 fuel injector connector may be plugged
connectors are installed on the correct
fuel injectors. If necessary, install the fuel
into the number 8 fuel injector and vice injector connectors correctly.
Bulletin 06-06-04-001 is being released versa. TIP: If you find that the fuel injector
to cover 2005-06 Chevrolet Impala,
Refer to the bulletin for details. Here connectors are correctly installed, refer to
Monte Carlo, TrailBlazer, GMC Envoy
are some highlights. the appropriate SI document for diagnosis
and Pontiac Grand Prix with 5.3L Active
Begin by using a scan tool to check for of the DTC(s) noted at the beginning.
Fuel Management (AFM) Engine (RPO
LH6 or LS4). DTC(s) and write them down. Finally, road test the vehicle at steady
IMPORTANT: Do not assume that the highway speeds, allowing the vehicle to
The customer may comment that the
fuel injector connectors are properly go into AFM to verify the repair.
SES light is on, but no other driveability or
performance concerns are reported. installed on the correct fuel injectors from – Thanks to Tom Smith
the factory.

5
 TACTips

Trailer Wiring Harness ID Four-Wire Harness

(Trailer Brake Controller)
When installing a trailer brake module or trailer connector on Black Ground
a 2003-06 Chevrolet Express or GMC Savana with RPO Z82
and/or UY7, it is necessary to know the location of the harness Red/White Stripe Fused Battery
and what each wire is used for. Dark Blue Trailer Brake Feed
The four-wire trailer brake controller harness is located on the Light Blue Fused Stop lamp/CHMSL
driver’s side, under the instrument panel, taped to the pass- Seven-Wire Harness
through main harness, between the park brake pedal and the (Trailer Light Brake/Wires)
vehicle brake pedal.
Light Green Back-up lamps
The seven-wire harness assembly is taped together and locat-
Brown Parking lamps
ed in a frame pocket at the driver side rear left corner of the
frame. Yellow Left stoplamp and turn signal
TIP: Both harnesses come without connectors. Dark Green Right stop lamp and turn signal
Dark Blue Electric trailer brakes
The following tables include the color of each blunt-cut wire
and its purpose. Orange Trailer accessory
– Thanks to Ron Erman White (heavy gage) Ground wire

Blue Coolant Poor Heater

This information applies to Chevrolet
Aveo (US and Canada), and Epica,
Performance
Optra and Wave (Canada) between
2004 - 2006.
According to Pre-Delivery Inspection
Bulletins 03-00-89-040 and 04-00-89-034,
the cooling system is filled at the factory
with a blue coolant (conventional ethyl-
ene glycol). The blue coolant should be
treated in the same manner as any other Heater hose not kinked
non-DexCool based coolant.
TIP: DexCool should not be mixed with the heater hose being pinched/kinked
conventional ethylene glycol coolants. at the lower radiator hose.
Heater hose kinked
When the cooling system needs to be To correct this condition, drain the
topped off or flushed, use a 50/50 mix- coolant system and reroute the heater
ture of clean, drinkable water (preferably Some owners of the 2006 Chevrolet hose to eliminate the pinch/kink.
distilled) and conventional ethylene glycol Silverado or GMC Sierra with 6.6L TIP: There is a white line on the
coolant that conforms to GM Engine RPO LBZ may comment on heater hose. It should be centered to
Specification 1825M, such as p/n poor heater performance. During nor- the front of the hard tube.
12378560 (US - 1 gallon) or p/n 993089 mal diagnostics, both heater hoses
(Canada - 4 liters). According to the may be cold. This may be caused by – Thanks to Jim Will
owner’s manual, this coolant must be
drained, flushed, and refilled every
30,000 miles (50,000 kilometers).
– Thanks to James Parkhurst
Trailer Light
Bulbs
On 2003-06 Chevrolet
Headlamp Washers Express and GMC Savana
vans equipped with the trailer
Inoperative towing package RPO Z82, the
The headlamp washers may be additional electrical load from
inoperative on some 2006 GMC Envoy the trailer’s turn signals and
and Envoy XL models built before stop lights is handled by relays and not the turn signal/hazard flasher module.
9/01/05. The headlamp washer supply Refer to SI document 848202 for a wiring diagram.
hose may be too long, causing the Vans without RPO Z82 use a turn signal/hazard flasher module to handle the
hose to kink. electrical load of the van’s turn signals and stop lights. Adding additional lights to
If the washer supply hose is kinked, this system may cause premature failure of the turn signal/hazard flasher module.
shorten the length of the supply hose TIP: If an owner inquires about a trailer wiring harness for a van not equipped
by up to 25 mm (1 in). Then reinstall with Z82, explain that the trailer cannot have more than one stop/turn bulb per
the hose and check it for kinks. If there side. If a trailer with more than one stop/turn bulb per side is connected, it may
are no kinks, check the operation of cause premature failure of the turn signal/hazard flasher module.
the headlamp washer system.
– Thanks to Ron Erman
– Thanks to Ron Erman

6
 TACTips

Headlamp Ballast Headlamp Fog

When servicing the headlamp ballast Owners of some 2005-06 Chevrolet Corvettes may note
on a 2005 Corvette built between that when the headlamps are on, light fog or cloudiness is
August and September, 2005, it is visible on the lenses. Some customers may also state that the
important to inspect the ballast before headlamp lenses have condensation or moisture.
ordering and replacing with a new The light fog or cloudiness
part. Some 2005 vehicles were built is caused by out gassing of
with a 2006 ballast. Ordering the the clear polycarbonate lenses
2005 ballast based on the parts cata- and is a normal characteristic
log may not provide the correct bal- of the vehicle. The headlamps
last to fit the vehicle’s application. are also vented; some con-
Inspect the ballast to determine the densation or moisture may be
number of mounting tabs, and order seen when humidity is high or
accordingly. there is a change in tempera-
ture. The moisture should
2005 ballast has order 2005 burn off after one hour of
3 mounting tabs p/n 12335922 headlamp operation.
2006 ballast has order 2006 Don’t replace the headlamp
4 mounting tabs p/n 89025794 lenses for the above con-
cerns.
– Thanks to Dino Poulos – Thanks to Paul Radzwilowicz

Whine Noise from Speakers Axle Vent Hose Fluid Leak

This information applies to 2003-06 Chevrolet
Some owners of a 2006 Buick second row seat fastens to the Silverado and Express, GMC Sierra and Savana, and
Rainier, Chevrolet Trailblazer, floor, the harness may be pinched Hummer H2
GMC Envoy or Saab 97x may or trapped under the front corner
comment about a generator of the second row seat frame An axle fluid leak that
whine noise heard from the or bolt. appears to be from the
end of the axle vent hose
vehicle’s speakers. This will be Open the passenger rear door most often occurs during
noticed with the radio on or off, and remove the sill plate. Locate hot ambient temperatures
engine running. the harness that travels along this and/or while towing.
This applies to short wheelbase sill plate area and follow to the
Installation of filter (p/n
vehicles equipped with UQA second row seat frame outer
5651632) will act as an accumulator and prevent
Bose Amplifier only. The amplifier mounting bolt. If you suspect that fluid from being forced out the end of the vent tube.
on the short wheel base is locat- the harness is pinched, remove Install the filter vertically in either direction approxi-
ed in the right rear quarter panel the second row seat and remove mately 10-15 cm
behind the trim. The harness is the trapped harness. Repair any (4-6 in) from the end vent cap of the hose or where
routed along the right side and damaged wires and secure the convenient. Retain the filter using the supplied hose
follows the contour of the floor harness to prevent damage in clamps and secure the filter and hose to prevent
close to the sill plates. If the har- the future. damage.
ness is not kept tight where the – Thanks to Dino Poulos – Thanks to Rusty Sampsel

Brake Cooling Ducts One wheel liner is

used with the short
Left Side Right Side
duct, and a different Air Duct 15829067 15829066
The 2006
Corvette Z06 uses liner is used with the Wheel Liner 15834373 15834374
a duct on each side long duct. There are Screw 11514623 11514623
to carry cooling air no service parts avail-
to the front brakes. able for the short duct Longer duct TIP: Some vehicles
setup. built before the VIN
On early vehicles,
break may not have
the duct carried air Early duct Regardless of which type of duct the
the duct fastener
rearward to an vehicle originally had, if a replacement is
mounting holes in
opening in the wheel liner. necessary, the long duct and correspond-
the frame. When
After VIN 1G1YY26EX65100198, a ing wheel liner must be used. necessary, these Drilling location
longer duct is used. It passes through the Here are the combinations of part num- holes will have to
wheel liner and dumps air directly on the bers that must be ordered for the long be drilled and tapped for the M6 fastener.
brake assembly. duct and wheel liner. – Thanks to Kiley Stites
 Car Issues – Fix It Right the First Time (new issues in bold)

Model Year(s) Vehicle Line(s) / Condition Do This Don’t Do This Reference

Information / Bulletin

2005 Chevrolet Corvette w/Navigation Radio – FM Radio Have customer switch from FM to AM and Don’t replace radio and/or antenna 05-08-44-014A
Static or No Reception back to FM. If this clears signal, no repairs module.
required.

2005 Cobalt, Pursuit (Canada Only) – CD Inoperative or Reprogram U1C radio for “locked” message Don’t replace radio assembly. 05-08-44-010B
Radio Displays “Locked” on control head.

2005-2006 G6 w/Panoramic Sunroof – Potential Noise Issues Refer to bulletin. Refer to bulletin. 05-08-67-014

2005 Corvette – Erratic Fuel Gauge Use new software release to add buffer to Don’t replace fuel sender, fuel module 05-08-49-027
fuel sender system. or fuel tank.

2005 Cobalt, Pursuit (Canada Only), ION, HHR – Remove TCM harness from TCM prior to Don’t remove TCM from bracket without 05-07-30-016A
Transmission Control Module (TCM) Shorted to removing from TCM holding bracket. first disconnecting TCM wiring
Battery Voltage During Diagnosis and/or Service harness.Don’t allow TCM to contact
positive battery post.

2005 VUE, Equinox LT/LS – Sunroof will not Close from Replace sunroof control module. Don’t replace sunroof module, motor or 05-08-67-010A
Vent, Partly Opened, or Fully Opened Position switch.

2005-2006 Uplander, Terraza, Relay, Montana SV6 – High Effort Replace horn pad springs. Don’t replace inflatable restraint steering 05-08-54-001
to Sound Horn, Horn Only Sounds When Certain wheel module.
Spots are Pressed

2005 Grand Prix, LaCrosse/Allure – Front Brake Moan Confirm that noise is coming from front Don’t resurface front rotors. 05-05-23-006
and/or Groan Noise During Brake Apply brakes – replace front brake pads.

2004-2005 Grand Prix (June built 2004, all 2005), LaCrosse/Allure Install 330MFD capacitor between LPM Don’t replace LPM, blower motor or 05-01-39-001A
(all 05) – Blower Motor Inoperative or Intermittent, circuit to ground. HVAC control head.
Blower Speed May Drop or Blower Continues to Run
After Key Off

2001-2003 Aztek, Rendezvous – Window Regulators Separate Use window regulator clips and procedure Don’t replace window regulator 03-08-64-015
from Window Motors outlined in bulletin. assemblies that are serviceable and only
have broken clips.

1999-2004 All Cars and Trucks – Brake Warranty, Service and Issue One: Refinish brake rotor. Issue One: Don’t replace brake rotors. 00-05-22-002D
Procedures Issue Two: Measure for LRO Issue Two: Don’t measure for LRO

2002-2005 Cars and Trucks – Multiple Driveability Clean fuel injectors as described in Bulletin. Don’t replace fuel injectors. 03-06-04-030A
Symptoms/Clogged Fuel Injectors

Truck Issues – Fix It Right the First Time (new issues in bold)

Model Year(s) Vehicle Line(s) / Condition Do This Don’t Do This Reference

Information / Bulletin

2002 TrailBlazers, Envoys, Bravada – Use GE-47676 to replace HVAC mode door Don’t replace cam assembly. 05-01-38-001A
Essential Tool for HVAC Mode Door Actuator actuator.
Replacement

2003-2005 SSR – Door Will Not Open From Inside Door Handle Replace door handle hinge support. Don’t replace door panel. 05-08-64-026

2004-2005 Colorado/Canyon – Side Door Window Glass Clips Replace door window glass. Don’t re-attach door window 04-08-64-022
Fall Off glass clips.

2001-2005 Chevrolet/GMC 36 Series Cab/Chassis – Modify fuel tank balance line. Don’t replace fuel tank unit, PCM 05-06-04-008
DTC P1172 or P2636, Fuel Gauge Reads Empty, SES or fuel transfer pump
Light On

2004-2005 All Cars and Trucks – State-of-Charge Upon Delivery Check battery’s state-of-charge using J- Don’t remove and replace battery. 02-06-03-009A
of a New Vehicle 42000 or J-42000-EU.

2002-2004 Silverado, Suburban, Tahoe, Sierra, Measure intake manifold for warpage across Don’t measure intake manifold across all 05-06-04-029
Yukon/XL, Escalade EXT – Rough Idle, two runner ports only. Replace upper four intake runner ports. Don’t replace
Misfire, MIL DTC P0300 manifold gasket with teal-green gasket. upper intake manifold gasket with
orange gasket.

2001-2003 Fullsize Pickups – Injector Replacement for High Use Bulletin 04-06-04-007A for injectors with Don’t replace 8 injectors for any Special Policy 04039
Flow Rates high fuel return rates. Use Special Policy complaint other than high fuel return
04039 for all 01-02 vehicles. rates. All other injector failures are fix as
failed.

Know-How 10206.03D Emerging Issues March 9, 2006 9:30 AM and 12:30 PM Eastern Time
Broadcasts New Model Features For Web NMF courses, log on to the GM Training Website
for (www.gmtraining.com). Select Service Know-How/TechAssists from
March the menu, then choose New Model Features for a selection of courses.

– Thanks to Tracy Rozman

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