Escalade AWD V8-6.2L (2009)
Lead for the COOL control circuit and the Negative Lead for the HEAT control circuit. If the resistance is measured with the seat still warm or
cool, the resistance values will vary even if the system was powered up for just a few seconds. The TED must be allowed to stabilize to room
temperature prior to a measurement. The conditions listed below will change the resistance to out of range values:
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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 warmer or cooler 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.
5. Test for 0.9-10.0 ohms between the control circuits listed below:
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Seat cushion heat control circuit terminal A X1 and cool control circuit terminal B X1
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Seat back heat control circuit terminal C X1 and cool control circuit terminal D X1
‹› If greater than the specified range, test the appropriate control circuits for an open/high resistance. If the circuits test normal, test or replace the
appropriate seat cushion or seat back heat/cool seat ventilation blower.
‹› If less than the specified range, test for a short between the appropriate control circuits. If the circuits test normal, test or replace the
appropriate seat cushion or seat back heat/cool seat ventilation blower.
6. Connect the X1, X2, X3 harness connectors to the CCSM.
7. Disconnect the harness connector at the seat cushion heat/cool seat ventilation blower.
8. 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.
9. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 5 and ground.
‹› If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
‹› If less than the specified range, replace the CCSM.
Important: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
10. 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
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.
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Seat cushion heat control circuit terminal 1
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Seat cushion cool control circuit terminal 3
‹› If the test lamp does not illuminate, test the appropriate control circuit for a short to ground. 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.
Important: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
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
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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.
