SB-10043892-6794
File in Section:

Service Bulletin

Bulletin No.:
Date:

PI0695
March, 2012

PRELIMINARY INFORMATION
Subject:

Diagnosis and Repair HVAC Blower Function

Models:

2008-2012 Cadillac Escalade, Escalade ESV, Escalade EXT
2007-2012 Chevrolet Silverado
2008-2012 Chevrolet Suburban, Tahoe
2007-2012 GMC Sierra
2008-2012 GMC Yukon, Yukon XL, Yukon Denali, Yukon Denali XL

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.

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1. Remove the cover on the right side of the instrument panel, exposing the junction blocks.

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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.

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2.
3.
4.
5.
6.
7.
8.
9.
10.

Locate Pin A6, Circuit 754.
Perform a pin drag test using test probe J-35616-2A (GY).
If the terminal fails the pin drag test, replace the terminal for Pin A6. Refer to Junction Block - Right I/P X4 in SI.
Cut off the terminal between the core and the insulation crimp to minimize any wire loss.
To minimize wire loss, remove only the insulation required.
Position the stripped wire in the terminal.
Hand crimp the core wings first.
Hand crimp the insulation wings around the cable.
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.

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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

*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