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2008 - MX-5 - Body and Accessories

No.4 ALL POWER WINDOWS ARE INOPERATIVE [POWER WINDOW SYSTEM]



4

All power windows are inoperative.

POSSIBLE CAUSE

  • Power supply circuit or ground circuit malfunction

    • Burnt fuse (B+)

    • Open or short circuit in wiring harness between ignition switch (IG1) 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 (switch malfunction)

  • Power window motor malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

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

  • Does any power window operate?

Yes

Go to step 5.

No

Go to the next step.

2

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

  • Does the power window operate?

Yes

Go to the next step.

No

Inspect for an open circuit in the wiring harness between the power window main switch and the body ground.

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

Repair or replace if necessary

3

  • Is the P.WIND 20 A fuse normal?

Yes

Replace with the appropriate standard fuse.

If the fuse is melted, inspect the wiring harness for a short to ground. Repair or replace the wiring harness, then replace the fuse.

No

Go to the next step. (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.)

4

  • 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.

5

  • Operate the 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.)

6

  • 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 guide.

No

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

7

NOTE:

  • Do not operate the power window main switch during the following inspection.

  • Inspect the continuity between power window main switch terminal (up-side 1I, 1D (power retractable hardtop model)/G, A (soft-top model) and ground.

  • Is there continuity?

Yes

Go to the next step.

No

Replace the power window main switch.

(See POWER WINDOW MAIN SWITCH REMOVAL/INSTALLATION.)

8

NOTE:

  • Do not operate the power window main switch during the following inspection.

  • Inspect the continuity between power window main switch terminal (down-side 1J, 1F (power retractable hardtop model)/B, D (soft-top model) and ground.

  • Is there continuity?

Yes

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

Repair or replace if necessary.

No

Replace the power window main switch.

(See POWER WINDOW MAIN SWITCH REMOVAL/INSTALLATION.)




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