Suburban 2WD V8-6.0L (2007)
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The test leads are incorrectly connected.
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Air blowing across the TED.
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Measuring the resistance at other than room temperature of 70°F (21°C).
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Holding the TED portion of the heat/cool seat ventilation blower in your hand.
In hotter or colder climates where room temperature conditions of 70°F (21°C) may be unattainable, resistance values may read above the
specified range. Use a heat gun or a blower to warm or cool the TED while measuring the resistance. The resistance values should slowly lower
toward the specified range.
Test for 0.9-10.0 ohms of resistance between the following heat control and cool control circuits.
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Connector C1: Seat cushion heat control circuit terminal G and cool control circuit terminal H.
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Connector C1: Seat back heat control circuit terminal J and cool control circuit terminal K.
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If greater than 10 ohms, test the control circuits for an open/high resistance. If the circuits test normal, test or replace the appropriate heat/cool
seat ventilation blower.
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If less than 0.9 ohm, test or replace the appropriate heat/cool seat ventilation blower.
6. Test for infinite resistance between the following circuits and ground.
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Connector C1:
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Seat cushion heat control circuit terminal G
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Seat cushion cool control circuit terminal H
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Seat back heat control circuit terminal J
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Seat back cool control circuit terminal K
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Connector C2:
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Seat cushion temperature sensor signal circuit terminal 7
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Seat back temperature sensor signal circuit terminal 9
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Connector C3:
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Seat cushion blower motor speed control circuit terminal 11
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Seat back blower motor speed control circuit terminal 12
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Blower motor supply voltage circuit terminal 16
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If less than infinite, test the appropriate circuit for a short to ground.
7. Connect the C1, C2, C3 harness connectors to the CCSM.
8. Disconnect the harness connector at the seat cushion heat/cool seat ventilation blower.
9. 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.
10. 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.
11. IMPORTANT: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
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.
12. IMPORTANT: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
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.
13. Connect the harness connector to the seat cushion heat/cool seat ventilation blower.
14. Disconnect the harness connector at the seat back heat/cool seat ventilation blower.
15. 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.
16. 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.
