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SEAT WARMER UNIT INSPECTION

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2016 – MX-5 – Body and Accessories

SEAT WARMER UNIT INSPECTION

WARNING:

Driver’s Side

Seat back

1. Disconnect the negative battery cable and wait 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

2. Disconnect the seat warmer unit connector.

3. Verify that the continuity between the seat warmer unit terminals is as indicated in the table.

4. Connect the seat warmer unit connector.

5. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

6. Switch the ignition to ACC or ON (engine off or on).

7. Turn the seat warmer switch off and leave it for 30 min or more to let the temperature around the thermistor reach normal temperature.

8. Measure the resistance between seat warmer control unit connector terminals F and H, and record it together with the temperature around the thermistor.

NOTE:

  • Measure the temperature around the thermistor using a dry-bulb thermometer.

9. Operate the seat warmer switch to warm the seat heater unit with an indicator light turned on.

10. Measure the resistance between seat warmer control unit connector terminals F and H, and record it together with the temperature around the thermistor.

11. Operate the seat warmer switch to warm the seat heater unit with three indicator lights turned on.

12. Measure the resistance between seat warmer control unit connector terminals F and H, and record it together with the temperature around the thermistor.

13. Verify that the resistance varies as the temperature increases.

Seat cushion

1. Disconnect the negative battery cable and wait 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

2. Disconnect the seat warmer unit connector.

3. Verify that the continuity between the seat warmer unit terminals is as indicated in the table.

Passenger’s Side

Seat back

1. Disconnect the negative battery cable and wait 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

2. Disconnect the seat warmer unit connector.

3. Verify that the continuity between the seat warmer unit terminals is as indicated in the table.

4. Connect the seat warmer unit connector.

5. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

6. Switch the ignition to ACC or ON (engine off or on).

7. Turn the seat warmer switch off and leave it for 30 min or more to let the temperature around the thermistor reach normal temperature.

8. Measure the resistance between seat warmer unit connector terminals 6C and 6D, and record it together with the temperature around the thermistor.

NOTE:

  • Measure the temperature around the thermistor using a dry-bulb thermometer.

9. Operate the seat warmer switch to warm the seat heater unit with an indicator light turned on.

10. Measure the resistance between seat warmer unit connector terminals 6C and 6D, and record it together with the temperature around the thermistor.

11. Operate the seat warmer switch to warm the seat heater unit with three indicator lights turned on.

12. Measure the resistance between seat warmer unit connector terminals 6C and 6D, and record it together with the temperature around the thermistor.

13. Verify that the resistance varies as the temperature increases.

Seat cushion

1. Disconnect the negative battery cable and wait 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

2. Disconnect the seat warmer unit connector.

3. Verify that the continuity between the seat warmer unit terminals is as indicated in the table.

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