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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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TEMPERATURE FOR SEAT WARMER SYSTEM CANNOT BE ADJUSTED [SEAT WARMER SYSTEM]

Description

  • The temperature of the seat warmer cannot be adjusted (temperature level cannot be switched).

  • The seat warmer temperature continues to rise.

Possible Causes

  • Seat warmer switch malfunction

  • Thermistor (built into seat warmer unit) malfunction

  • Seat warmer control unit malfunction

  • Short to power supply in wiring harness between the following terminals:

    • Seat warmer control unit terminal J and indicator unit terminal D

Diagnostic Procedure

Step

Inspection

Action

1

 DETERMINE IF MALFUNCTION CAUSE IS SEAT WARMER SWITCH

Yes

Go to the next step.

No

Replace the indicator unit.

(See INDICATOR UNIT REMOVAL/INSTALLATION.)

2

 VERIFY IF MALFUNCTION CAUSE IS SEAT WARMER UNIT

  • Switch the ignition OFF (LOCK).

  • Inspect the thermistor built into the seat warmer unit.

    (See SEAT WARMER UNIT INSPECTION.)

  • Is the seat warmer unit normal?

Yes

Go to the next step.

No

Replace the seat warmer unit which has a malfunction, then go to Step 4.

(See SEAT BACK TRIM REMOVAL/INSTALLATION.)

(See SEAT CUSHION TRIM REMOVAL/INSTALLATION.)

3

 DETERMINE IF MALFUNCTION CAUSE IS SEAT WARMER CONTROL UNIT

Yes

  • Refer to the wiring diagram and verify if there is a common connector between the following terminals.

    • Seat warmer control unit terminal J and indicator unit terminal D

        • If there is a common connector:

      • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to power supply to determine the malfunctioning location.

      • Repair or replace the wiring harness which is shorted to the power supply.

        If there is no common connector:

      • Repair or replace the wiring harness which is shorted to the power supply.

  • Go to the next step.

No

Replace the seat warmer control unit, then go to the next step.

(See SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION.)

4

 VERIFY IF MALFUNCTION CAUSE IS CORRECTED

  • Switch the ignition ON (engine off or on).

  • Operate the seat warmer switch to turn on the seat warmer system.

  • Does the seat warmer system operate normally?

Yes

Troubleshooting completed. (Explain the contents of the servicing to the customer.)

No

Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.

(See SYMPTOM TROUBLESHOOTING [SEAT WARMER SYSTEM].)
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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