Yukon Denali 2WD V8-6.0L Hybrid (2010)
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Heated/Cooled Seats Description and Operation (See: Description and Operation/Heated/Cooled Seats Description and Operation)
Electrical Information Reference
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Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
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Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Connector
Repairs/Connector Repairs)
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Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
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Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, observe the HVAC control panel while pressing and releasing the appropriate heated or cooled seat switch. The appropriate switch
symbol should be displayed on the control panel.
‹› If the symbol is not displayed, replace the HVAC control module.
2. Engine running, operate the driver and passenger heated and cooled seats through the modes of operation listed below. The seat should operate in
all three modes.
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Seat back and cushion heat mode
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Back only heat mode
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Cool mode
‹› If both, the driver and passenger heated/cool seats are inoperative, refer to Driver and Passenger Heated/Cool Seats Inoperative.
‹› If the driver heated/cool seat is inoperative, refer to Driver Heated/Cool Seat Circuit System Testing.
‹› If the passenger heated/cool seat is inoperative, refer to Passenger Heated/Cool Seat Circuit System Testing.
Circuit/System Testing
Driver and Passenger Heated/Cool Seats Inoperative
1. Ignition OFF, disconnect the X1 harness connector at the CCSM.
2. Verify that a test lamp illuminates between the ground circuit terminal M and B+.
‹› If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
3. Verify that a test lamp illuminates between the B+ circuit terminal E and ground.
‹› If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Disconnect the X2 harness connector at the CCSM.
5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
‹› If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
6. If all circuits test normal, replace the CCSM.
Driver Heated/Cool Seat Circuit System Testing
1. Ignition OFF, disconnect the X3 harness connector at the CCSM.
2. Connect a test lamp between the signal circuit terminal 14 and B+.
3. Ignition ON, press the HEAT or COOL seat switch through the high, medium, and low positions to OFF. The test lamp should illuminate until the
OFF position is reached.
‹› If the test lamp does not illuminate, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace
the MSM.
‹› If the test lamp is ON with the switch in the OFF position, test the signal circuit for a short to ground. If the circuit tests normal, replace the
