Schematic Reference: Driver Seat Schematics , Passenger Seat Schematics , and Rear Seat Schematics

DEFINITION: One or more heat/cool seat switch indicators are inoperative and the related heat/cool seat function may or may not operate.

Did you review the Heated/Cooled Seats Description and Operation and perform the necessary inspections?

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Go to Step 2

Go to Symptoms - Seats

Verify the fault is present.

Does the system operate normally?

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Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Are all of the indicators on the affected switch inoperative?

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Go to Step 4

Go to Step 5

Do the heat/cool seat functions operate?

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Go to Step 6

Go to Step 7

Does the heat/cool seat function of the affected indicator operate?

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Go to Step 9

Go to Step 10

1. Disconnect the heat/cool seat switch connector.
2. Test the heat/cool seat switch ground circuit for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 13

1. Disconnect the heat/cool seat switch connector.
2. Turn the ignition ON.
3. Test the ignition voltage supply circuit to the heat/cool seat switch for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 13

1. Turn the ignition OFF.
2. Connect the heat/cool seat switch.
3. Turn the ignition ON.
4. Using a DMM, test the voltage of the heat select switch signal circuit by back probing the terminal in the switch connector.
5. Press and hold the heat select switch.

Is the voltage at or near the specified value?

12 V

Go to Step 14

Go to Step 13

1. Using a DMM, test the voltage of the indicator control circuit by back probing the terminal in the switch connector.
2. Turn the ignition ON.
3. Operate the system in a mode which the indicator would normally be illuminated.

Is the voltage at or near the specified value?

12 V

Go to Step 13

Go to Step 11

1. Using a DMM, test the voltage of the affected switch signal circuit by back probing the terminal in the switch connector.
2. Turn the ignition ON.
3. Press and hold the affected switch.

Is the voltage at or near the specified value?

12 V

Go to Step 12

Go to Step 13

Test the indicator control circuit for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 14

Test the switch signal circuit for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 14

Inspect for poor connections at the heat/cool seat switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 15

Inspect for poor connections at the signal converter. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 16

Replace the heat/cool seat switch. Refer to Heated and Cooled Seat Switch Replacement .

Is the repair complete?

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Go to Step 17

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Replace the signal converter. Refer to Passenger Seat Cushion Ventilation Heating and Cooling Module Replacement .

Is the repair complete?

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Go to Step 17

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3