The following technical tips provide repair information about specific conditions on a variety of vehicles. If you have a tough or unusual service repair, the TSS Technical Assistance Hot Line can help. Call 1-800-825-5886, prompt #2, to speak with a technical expert with the latest OEM information.
Various Electrical Conditions
2005-2008 Cobalt, 2007-2008 G5
The following electrical issues may be evident on some models: SIR warning lamp illuminated, instrument panel lights flicker/inoperative, parking lamps flicker/inoperative, tail lamps dim/inoperative, trunk open lamp illuminated, radio inoperative, door lock inoperative, no start, or no crank.
One possible cause of these conditions may be the interior wiring at the S361/J361 splice. Inspect splice S361/J361, parking lamp circuit, located in the body harness under the driver's seat. (Fig. 15, A)
(Fig. 15)
Remove the driver's seat from the vehicle and the driver's door opening carpet retainer. Peel back the carpet to about the "B" pillar and inspect the wires. If there is any damage, repair splice S361/J361 and other wires. Be sure to shrink-wrap any repairs to protect against moisture. If there is excessive moisture or water evident, water-test the vehicle for any leaks.
Replacement Rear Leaf Spring
2004-2009 Colorado or Canyon
When installing a replacement rear leaf spring (Fig. 16), technicians may notice a change in the diameter of the center alignment bolt on the replacement spring. Inspect the replacement spring center alignment bolt. If the head of the bolt measures approximately 15mm, it is a new design spring.
(Fig. 16)
Perform the following modification to allow installation of the replacement spring to the axle:
1. Obtain a 19/32" drill bit. Do not make a substitution for this drill bit size. Failure to use the specified size could alter the alignment of the vehicle and the driveline.
2. Carefully center the drill bit on the hole in the mounting plate on the axle and enlarge the hole.
3. Install the replacement spring, verifying proper fit to the axle.
Power Steering Hose Retrofit Procedure
2006 Impala or Monte Carlo or 2005-2006 Grand Prix, with a V8 engine
When replacing the power steering hose, it's important to note that the new power steering hose is physically different than the original. The newly designed hose has a fin-type cooler built onto the hose assembly.
The new design power steering hose should include installation instructions, which describe how to install the new design hose on vehicles that did not have this style hose previously. Per the installation instructions, it is necessary to drill mounting holes in the cradle to attach the new design hose assembly to the vehicle. (Fig. 17)
(Fig. 17)
Refer to GM bulletin #06-02-32-014 for more information.
UBEC Fuses
2006-2010 Impala and 2006-2007 Monte Carlo
When diagnosing a condition with the turn signals, trunk actuator, courtesy lamps, or Brake Transmission Shift Interlock (BTSI), it may be possible to overlook some fuses in the Underhood Bussed Electrical Center (UBEC).
The common architecture Body Control Module (BCM) uses several fuses for power, and the labeling of the fuses may be misread.
· If the fuse in the UBEC labeled RT T/SIG is open, it will cause the right rear turn signal, the trunk actuator, and the BTSI to be inoperative. The right front turn signal will still function.
· If the fuse in the UBEC labeled INT LIGHTS is open, it will cause the right front turn signal to be inoperative. The right rear turn signal will still function and the courtesy lamps will still function.
· If the fuse in the UBEC labeled INT LTS/PNL DIM is open, the courtesy lamps will be inoperative. The instrument panel cluster backlighting will still function.
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