Tahoe 2WD V8-6.0L Hybrid (2008)
4. Test for 300 ohms to 18K ohms of resistance between the following temperature sensor signal and low reference circuits.
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Connector X2 seat cushion temperature sensor signal circuit terminal 2 and low reference circuit terminal 3.
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Connector X2 seat back temperature sensor signal circuit terminal 4 and low reference circuit terminal 5.
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If the resistance is greater than the specified value, test the sensor signal circuit and low reference circuit for a short to voltage or an open/high
resistance. If the circuits test normal, test or replace the appropriate heat/cool seat ventilation blower.
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If the resistance measures less than the specified value, test or replace the appropriate heat/cool seat ventilation blower.
Important: 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 following conditions 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 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 X1: Seat cushion heat control circuit terminal A and cool control circuit terminal B
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Connector X1: Seat back heat control circuit terminal C and cool control circuit terminal D
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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.
5. 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 A
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Seat cushion cool control circuit terminal B
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Seat back heat control circuit terminal C
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Seat back cool control circuit terminal D
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Connector C2:
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Seat cushion temperature sensor signal circuit terminal 2
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Seat back temperature sensor signal circuit terminal 4
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Connector C3:
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Seat cushion blower motor speed control circuit terminal 3
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Seat back blower motor speed control circuit terminal 4
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Blower motor supply voltage circuit terminal 8
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If less than infinite, test the appropriate circuit for a short to ground.
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. 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.
