Escalade AWD V8-6.2L (2009)
Note: If the resistance is measured with the seat still warm or cool, the resistance values will vary. At 68°F, (20°C) the nominal resistance value is
1200 Ohms ±5 percent. For warmer or cooler ambient temperatures, refer to the Temperature vs Resistance table below. The delta resistance
values between the seat cushion and seat back temperature sensors should not be greater than 2000 Ohms.
4. Ignition OFF, test for 300 Ohms - 18 kOhms between the signal and low reference circuits listed below:
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Seat cushion temperature sensor signal circuit terminal 7 X2 and low reference circuit terminal 8 X2.
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Seat back temperature sensor signal circuit terminal 9 X2 and low reference circuit terminal 10 X2.
‹› If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, test or replace the
appropriate seat cushion or seat back heat/cool seat ventilation blower.
‹› If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits test
normal, test or replace the appropriate seat cushion or seat back heat/cool seat ventilation blower.
Note: The test leads must be connected in the correct polarity, otherwise lower out of range values will appear. Use the Positive 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 control circuit terminal G X1 and control circuit terminal H X1
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Seat back control circuit terminal J X1 and control circuit terminal K X1
‹› 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.
‹› 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.
6. Connect the X1, X2, X3 harness connectors at 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 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.
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 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.
