SEAT WARMER UNIT INSPECTION

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Note

•  When the seat warmer switch is turned on with the main power switched ON (READY on), the seat warmer system operates.

Simple Inspection

1.  Place a cooling agent on the seat cushion (thermistor).

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2.  Operate the seat warmer switch to turn on the seat warmer.

3.  Touch the seat cushion and the seat back to verify a temperature increase.

4.  If a temperature increase cannot be verified, go to the resistance inspection. (See Resistance Inspection.)

Resistance Inspection

Driver-side

Front seat cushion

1.  Switch the main power OFF.

2.  Disconnect the negative lead-acid battery terminal and wait for 1 min or more. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.)

3.  Disconnect the driver-side seat warmer unit connector.

4.  Inspect for continuity between the driver-side seat warmer unit connector terminal 6A—6B (without driver-side power seat) / 6A—1K (with driver-side power seat).

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―  If not as indicated in the table, replace the front seat cushion pad.(See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION [(E)].)

5.  Measure the resistance between the driver-side seat warmer unit connector terminals 6C and 6D (without driver-side power seat) / 2O and 2X (with driver-side power seat), and verify that the condition is as indicated in the table.

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•  If the thermistor characteristic is not as shown in the graph, replace the front seat cushion pad.(See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION [(E)].)

Front seat back

1.  Switch the main power OFF.

2.  Disconnect the negative lead-acid battery terminal and wait for 1 min or more. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.)

3.  Disconnect the driver-side seat warmer unit connector.

4.  Inspect for continuity between the passenger-side seat warmer unit connector (short cord) terminal A—B.

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―  If not as indicated in the table, replace the front seat back pad.(See FRONT SEAT BACK TRIM REMOVAL/INSTALLATION [(E)].)

Passenger-side

Front seat cushion

1.  Switch the main power OFF.

2.  Disconnect the negative lead-acid battery terminal and wait for 1 min or more. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.)

3.  Disconnect the passenger-side seat warmer unit connector.

4.  Inspect for continuity between the passenger-side seat warmer unit connector terminal 6A—1K (without driver-side power seat) / 6A—6B (with driver-side power seat).

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―  If not as indicated in the table, replace the front seat cushion pad.(See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION [(E)].)

5.  Measure the resistance between the passenger-side seat warmer unit connector terminals 2O and 2X (without driver-side power seat) /,6C and 6D (with driver-side power seat), and verify that the condition is as indicated in the table.

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•  If the thermistor characteristic is not as shown in the graph, replace the front seat cushion pad.(See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION [(E)].)

Front seat back

1.  Switch the main power OFF.

2.  Disconnect the negative lead-acid battery terminal and wait for 1 min or more. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.)

3.  Disconnect the passenger-side seat warmer unit connector.

4.  Inspect for continuity between the passenger-side seat warmer unit connector (short cord) terminal A—B.

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―  If not as indicated in the table, replace the front seat back pad.(See FRONT SEAT BACK TRIM REMOVAL/INSTALLATION [(E)].)