Suburban 2WD V8-5.3L (2008)
9. Ignition ON, test for 4.8-5.2 volts between the temperature sensor signal circuit terminal 5 and ground.
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If greater than 5.2 volts, test the signal circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
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If less than 4.8 volts, replace the CCSM.
Important: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
10. Ignition ON, connect a test lamp between the following control circuits and ground. The test lamp should illuminate or slowly illuminate for
approximately 2-4 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.
Press the HEAT switch for heat control and the COOL switch for cool control.
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Terminal 1 seat cushion heat control circuit
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Terminal 3 seat cushion cool control circuit
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If the test lamp does not illuminate, replace the CCSM.
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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.
Important: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
11. Connect a test lamp between the following circuits and ground. The test lamp should illuminate or slowly illuminate for approximately 5 seconds
after pressing the HEAT switch.
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Terminal 2 seat cushion blower motor supply voltage
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Terminal 7 seat cushion blower motor speed control
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If the test lamp does not illuminate, test the appropriate circuit for an open/high resistance. If the circuit tests normal, replace the CCSM.
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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. 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. Ignition OFF, test for less than 5 ohms of resistance between the blower motor low reference circuit terminal 4 and ground.
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If greater than 5 ohms, 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 volts between the temperature sensor signal circuit terminal 5 and ground.
^
If greater than 5.2 volts, test the signal circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
^
If less than 4.8 volts, replace the CCSM.
Important: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
16. Ignition ON, connect a test lamp between the following control circuits and ground. 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.
Press the HEAT switch for heat control and the COOL switch for cool control.
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Terminal 1 seat back heat control circuit
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Terminal 3 seat back cool control circuit
^
If the test lamp does not illuminate, 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.
Important: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
17. Connect a test lamp between the following circuits and ground. The test lamp should illuminate or slowly illuminate for approximately 5 seconds
after pressing the HEAT switch.
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Terminal 2 seat back blower motor supply voltage circuit
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Terminal 7 seat back blower motor speed control