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2008 - MX-5 - Body and Accessories

No.2 THE DRIVER'S SIDE POWER WINDOW IS INOPERATIVE [POWER WINDOW SYSTEM]



2

The driver's side power window is inoperative.

POSSIBLE CAUSE

  • Power supply circuit or ground circuit malfunction

    • Burnt fuse (B+)

    • Open or short circuit in wiring harness between fuse (B+) and power window main switch

    • Open or short circuit in wiring harness between power window main switch and power window motor

    • Open or short circuit in wiring harness between power window main switch and ground

  • Power window main switch malfunction

  • Power window motor malfunction

  • Power window regulator malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

  • Turn the ignition switch to the ON position.

  • Does the LED on the power window main switch illuminate?

Yes

Go to step 6.

No

Go to the next step.

2

  • Operate the passenger's side power window using the power window main switch.

  • Does the power window operate properly?

Yes

Go to the next step.

No

Inspect for an open or short circuit in the following wiring harnesses. Inspect the connector connections (damage/pulled-out pins, corrosion):

  • P.WIND 20 A fuse—Power window main switch terminal 1B (power retractable hardtop model)/I (soft-top model)

  • Power window main switch terminal 1G (power retractable hardtop model)/terminal J (soft-top model)—ground.

Repair or replace if necessary.

3

  • Is the P.WIND 20 A fuse normal?

Yes

Go to step 5. (power retractable hardtop model with exterior open function)

Replace the power window main switch.

(See POWER WINDOW MAIN SWITCH REMOVAL/INSTALLATION.)

(power retractable hardtop model without exterior open function/soft-top model)

No

Inspect the following:

  • Short circuit in B+ power supply wiring harness

  • Short circuit in power window motor

Repair or replace if necessary.

Replace with the appropriate standard fuse.

Then, go to the next step.

4

  • Operate the power window system.

  • Do the power windows operate properly?

Yes

Troubleshooting is completed.

No

Re-confirm the symptom and go to step 1.

5

  • Measure the voltage at the power window main switch terminal 1A.

  • Is the voltage B+?

Yes

Replace the power window main switch.

(See POWER WINDOW MAIN SWITCH REMOVAL/INSTALLATION.)

No

Inspect for an open or short circuit in the power window main switch wiring harness (battery power supply).

Inspect the power window main switch connector connection. (damage/pulled-out pins, corrosion)

Repair or replace if necessary.

6

  • Measure the voltage at the power window main switch. (power window motor output terminal) while operating the power window using the power window main switch.

  • Is the voltage B+?

    • Power retractable hardtop model:
    • Open: terminal 1J/close: terminal 1I

      Soft-top model:
    • Open: terminal B/close: terminal G

Yes

Go to the next step.

No

Replace the power window main switch.

(See POWER WINDOW MAIN SWITCH REMOVAL/INSTALLATION.)

7

  • Measure the voltage at the power window motor. (battery power supply terminal) while operating the power window using the power window main switch.

  • Is the voltage B+?

    (Open: terminal A/close: terminal G)

Yes

Go to the next step.

No

Inspect for an open or short circuit in the wiring harness between the power window main switch and the power window motor.

Inspect the power window main switch and power window motor connector connections. (damage/pulled-out pins, corrosion)

Repair or replace if necessary.

8

  • Operate the driver's side power window using the power window main switch.

  • Does the power window motor operate (rotate)?

CAUTION:

  • If the power window motor temperature is high, the motor may not rotate due to the motor internal bimetal function. Leave it untouched for about 3 min to cool it down, then reinspect.

Yes

Go to the next step.

No

Replace the power window motor.

(See POWER WINDOW REGULATOR REMOVAL/INSTALLATION.)

9

  • Remove the door glass from the carrier plate.

  • Make sure that the door glass moves smoothly using your hand.

  • Does the door glass move smoothly?

Yes

Replace the power window regulator.

(See POWER WINDOW REGULATOR REMOVAL/INSTALLATION.)

No

Inspect for a bent regulator guide or other possible malfunction. If normal, replace the door glass run-channel.




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