Sierra Denali RWD V8-6.2L (2009)
‹› 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.
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Seat back blower motor control circuit terminal 2
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Seat back 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.
Component Testing
Heated and Cooled Seat Switch
1. Ignition OFF, disconnect the X4 harness connector at the appropriate door lock/window switch.
2. Test for infinite resistance between the low reference circuit terminal 4 and the signal terminals listed below the with the switch in the open
position.
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Seat back only mode switch terminal 7
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Seat back cushion heat switch terminal 6
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Seat cool switch terminal 3
‹› If not the specified value, replace the heated and cooled seat switch.
3. Test for less than 2 Ω between the low reference circuit terminal 4 and the signal terminals listed below with the appropriate switch in the
closed position.
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Seat back only mode switch terminal 7
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Seat back cushion heat switch terminal 6
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Seat cool switch terminal 3
‹› If greater than the specified range, replace the heated and cooled seat switch.
4. Connect a 3 A fused jumper wire between the low reference circuit terminal 4 and ground.
5. Connect a test lamp between B+ and each control terminal listed below. The appropriate indicator should illuminate.
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Seat back only mode indicator terminal 11
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Seat cool mode indicator terminal 12
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Seat back and cushion indicator terminal 10
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Low temperature indicator terminal 9
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Medium temperature indicator terminal 1
