Inspection Procedure 2

INSPECTION PROCEDURE 2: Pump motor does not operate.






CIRCUIT OPERATION

Power for the convertible top pump motor is supplied by the convertible top relay. The convertible top control module turns ON/OFF the convertible top relay by turning ON/OFF the transistor in the ECU to control the convertible top pump motor.

TROUBLESHOOTING HINTS

- Malfunction of the convertible top relay
- Malfunction of the convertible top pump motor
- Damaged harness wires and connectors
- Malfunction of the convertible top control module

DIAGNOSIS

Required Special Tool

- MB991958 Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827 M.U.T.-III USB Cable
- MB991910 M.U.T.-III Main Harness A
- MB991223 (MB991222): Harness set (Probe)
- MB992006: Extra fine probe

STEP 1. Check convertible top relay connector D-44 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is the check result satisfactory?

YES Go to Step 2.

NO Repair or replace the damaged component(s).

STEP 2. Convertible top relay check





Q. Is the check result satisfactory?

YES Go to Step 3.
NO Replace the convertible top relay.
STEP 3. Measure the voltage at convertible top relay connector D-44.





(1)Disconnect convertible top relay connector D-44, and measure at the wiring harness side.
(2)Turn the ignition switch to the "ON" position.





(3)Measure the voltage between terminal 2 and ground.

- The measured value should be approximately 12 volts (battery positive voltage).

Q. Is the check result satisfactory?

YES Go to Step 6.

NO Go to Step 4.

STEP 4. Check convertible top control module connector D-45 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is the check result satisfactory?

YES Go to Step 5.

NO Repair or replace the damaged component(s).

STEP 5. Check the harness between convertible top control module connector D-45 (terminal 42) and convertible top relay connector D-44 (terminal 2).





- Check the relevant harness for open or short circuit.

Q. Is the check result satisfactory?

YES Go to Step 13.

NO Repair the harness wire.

STEP 6. Measure the voltage at convertible top relay connector D-44.





(1)Disconnect convertible top relay connector D-44, and measure at the wiring harness side.
(2)Turn the ignition switch to the "ON" position.





(3)Measure the voltage between terminal 4 and ground.

- The measured value should be approximately 12 volts (battery positive voltage).

Q. Is the check result satisfactory?

YES Go to Step 7.

NO Check the wiring harness between convertible top relay connector D-44 (terminal 4) and fusible link No.28. Repair as necessary.

STEP 7. Check convertible top motor connector D-41 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is the check result satisfactory?

YES Go to Step 8.

NO Repair or replace the damaged component(s).

STEP 8. Convertible top motor check

Connect the battery to the terminal of convertible top motor connector D-41.

- Connect terminal 1 to the positive battery terminal
- Connect terminal 2 to the negative battery terminal

Q. Does the motor rotate?

YES Go to Step 9.
NO Replace the convertible top motor.
STEP 9. Check the harness between convertible top motor connector D-41 (terminal 1) and convertible top relay connector D-44 (terminal 3).





- Check the relevant harness for open or short circuit.

Q. Is the check result satisfactory?

YES Go to Step 10.

NO Repair the harness wire.

STEP 10. Check the harness between convertible top motor connector D-41 (terminal 2) and ground.





- Check the wiring harness for open circuit.

Q. Is the check result satisfactory?

YES Go to Step 11.

NO Repair the harness wire.

STEP 11. Check convertible top control module connector D-45 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is the check result satisfactory?

YES Go to Step 12.

NO Repair or replace the damaged component(s).

STEP 12. Check the harness between convertible top control module connector D-45 (terminal 41) and convertible top relay connector D-44 (terminal 1).





- Check the wiring harness for open circuit.

Q. Is the check result satisfactory?

YES Go to Step 13.

NO Repair the harness wire.

STEP 13. Retest the system.

Check that the motor starts to run.

Q. Is the check result satisfactory?

YES Intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Replace the convertible top control module connector.