Tahoe 4WD V8-6.2L (2009)
11. Ignition OFF then ON, connect a test lamp between the circuits listed below and ground. The test lamp should illuminate or slowly illuminate for
approximately 5 seconds after pressing the HEAT switch.
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Seat cushion blower motor control terminal 2
*
Seat cushion blower motor speed control terminal 7
‹› If the test lamp does not illuminate, test the appropriate circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the CCSM.
‹› If the test lamp is always ON, test the appropriate circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
12. Ignition OFF, connect the harness connector to the seat cushion heat/cool seat ventilation blower.
13. Disconnect the harness connector at the seat back heat/cool seat ventilation blower.
14. Test for less than 5 Ohms between the low reference circuit terminal 4 and ground.
‹› If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the CCSM.
15. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal 5 and ground.
‹› If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the
CCSM.
‹› If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
Note: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
16. Ignition OFF then ON, connect a test lamp between the control circuits listed below and ground. Press the HEAT switch when testing the heat
control circuit and the COOL switch when testing the cool control circuit. The test lamp should illuminate or slowly illuminate for approximately 4
seconds after the switch is pressed. On the heat control circuit, the test lamp may exhibit a 4 second delay before it starts to illuminate.
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Seat back heat control circuit terminal 1
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Seat back cool control circuit terminal 3
‹› If the test lamp does not illuminate, test the appropriate control circuit for a short to ground or an open/high resistance. If the circuit tests
normal, replace the CCSM.
‹› If the test lamp is always ON, test the appropriate control circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
Note: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
17. Ignition OFF then ON, connect a test lamp between the circuits listed below and ground. The test lamp should illuminate or slowly illuminate for
approximately 5 seconds after pressing the HEAT switch.
*
Seat back blower motor control circuit terminal 2
*
Seat cushion blower motor speed control terminal 7
‹› If the test lamp does not illuminate, test the appropriate circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the CCSM.
‹› If the test lamp is always ON, test the appropriate circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
18. If all circuits test normal, test or replace the appropriate seat cushion or seat back heat/cool seat ventilation blower.
Heated/Cooled Seats Inoperative (X88 or Z88) (Part 2)
Heated/Cooled Seats Inoperative (X88 or Z88) -Continued
Passenger Heated/Cool Seat Inoperative
1. Ignition OFF, disconnect the X1, X2, X3 harness connectors at the CCSM.
2. Connect a test lamp between the signal circuit terminal 6 X3 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 remains ON with the switch in the OFF position, test the signal circuit for a short to ground. If the circuit tests normal, replace
the MSM.
