PI0695A

Bulletin No.: PI0695A
Date: Nov-2012
Subject:
Diagnosis and Repair HVAC Blower Function
Models:
2008-2013 Cadillac Escalade Models
2007-2013 Chevrolet Silverado
2008-2013 Chevrolet Suburban, Tahoe
2007-2013 GMC Sierra
2008-2013 GMC Yukon Models
All Built Prior to November 1, 2012
This PI is being revised to add the 2013 model year and build date information. Please discard PI0695.
Condition/Concern
Some customers may comment that the HVAC blower motor is not functioning. They may also comment that there is no air flow from the HVAC vents. This may
be an intermittent condition.
One possible cause of this condition may be the contacts in the HVAC junction block(s) located at the right side of the instrument panel.
Recommendation/Instructions
Important: Do Not Replace the HVAC blower motor assembly to correct this condition.
Use the following steps to diagnose the condition and, if necessary, replace the affected connector terminal in the instrument panel junction block.
1
1.
Remove the cover on the right side of the instrument panel, exposing the junction blocks.
2
2.
Identify Junction Block X4 and X6.
3.
With the ignition key in the on position, turn on the HVAC blower and apply light hand pressure to the connectors. Determine if this movement affects the
blower operation (intermittent operation).
4.
Determine which junction block is affecting the blower operation.
Junction Block X4 Correction
Use the following diagnostic and repair steps if the fault is determined to be caused by the X4 junction block.
1.
Make sure there are no backed out or loose terminals using the appropriate Terminal Test Probe.
A1
A7
B1
B7
2.
Locate Pin A6, Circuit 754.
3.
Perform a pin drag test using test probe J-35616-2A (GY).
4.
If the terminal fails the pin drag test, replace the terminal for Pin A6. Refer to Junction Block - Right I/P X4 in SI.
5.
Cut off the terminal between the core and the insulation crimp to minimize any wire loss.
6.
To minimize wire loss, remove only the insulation required.
7.
Position the stripped wire in the terminal.
3
8.
Hand crimp the core wings first.
9.
Hand crimp the insulation wings around the cable.
10. Solder the hand crimp terminal.
Junction Block X6 Correction
Use the following diagnostic and repair steps if the fault is determined to be caused by the X6 junction block.
1.
Make sure there are no backed out or loose terminals using the appropriate Terminal Test Probe.
A
B
2.
Locate Pin A, Circuit 542.
3.
Perform a pin drag test using test probe J-35616-42 (RD).
4.
If the terminal fails the pin drag test, replace the terminal for Pin A. Refer to Junction Block - Right I/P X6 in SI.
5.
Cut off the terminal between the core and the insulation crimp to minimize any wire loss.
6.
To minimize wire loss, remove only the insulation required.
7.
Position the stripped wire in the terminal.
8.
Hand crimp the core wings first.
9.
Hand crimp the insulation wings around the cable.
10. Solder the hand crimp terminal.
Reconnect the junction block.
Verify the condition has been corrected.
Reinstall the instrument panel right cover.
Parts Information
Note: Following a warranty repair, all parts are to be turned into the parts department by the technician for tagging, retention and/or return.
Part Number
Description
12191812/19
Junction Block X4–Terminal/Tray
12084590/3
Junction Block X6–Terminal/Tray
Warranty Information
For vehicles repaired under warranty, and found to have had the above condition, use:
Labor Operation
Description
Labor Time
N9682*
Diagnose/Repair – HVAC Blower Inoperative
0.3 hr
Add
Replace First Junction Block Terminal
0.2 hr
Add
Each Additional Terminal Replacement
0.1 hr
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*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.
Customer Complaint Code
Code
Description (Category: 06 Heating/Ventilation/Air Conditioning)
0723
Heating/Ventilation/Air Conditioning - Heater Performance
Code
Description (Category: 06 Heating/Ventilation/Air Conditioning)
7083
Wiring/Electrical/Sensors - Poor Contact
Cause Code
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may
occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools,
safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that
your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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