Inspection Procedure F-1

INSPECTION PROCEDURE F-1: Sunroof: Sunroof does not operate.






















CIRCUIT OPERATION

- The sunroof motor assembly is energized through fusible link (5) by the battery.
- When the ignition switch (IG2) signal is on, the sunroof motor assembly is ready to operate.

TROUBLESHOOTING HINTS

- The sunroof switch may be defective
- The sunroof motor assembly may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:

- MB991223: Test Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check sunroof motor assembly connector D-35 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is sunroof motor assembly connector D-35 in good condition?

YES Go to Step 2.

NO Repair or replace the damaged component(s). Harness Connector Inspection. Check that the sunroof works normally.

STEP 2. Check the fusible link (5) line of power supply circuit to the sunroof motor assembly. Measure the voltage at sunroof motor assembly connector D-35.





(1)Disconnect sunroof motor assembly connector D-35 and measure the voltage available at the wiring harness side of the connector.





(2)Measure the voltage between terminal 1 and ground.

- The voltage should measure approximately 12 volts (battery positive voltage).

Q. Is the measured voltage approximately 12 volts (battery positive voltage)?

YES Go to Step 4.

NO Go to Step 3.

STEP 3. Check the wiring harness between sunroof motor assembly connector D-35 (terminal 1) and fusible link (5).

- Check the power supply line for open circuit and short circuit.

















NOTE:
Also check junction block connectors C-202, C-216, intermediate connector C-24, C-27 and D-29 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-202, C-216, intermediate connector C-24, C-27 or D-29 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between sunroof motor assembly connector D-35 (terminal 1) and fusible link (5) in good condition?

YES No action is necessary and testing is complete.

NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Check that the sunroof works normally.

STEP 4. Check the ignition switch (IG2) circuit to the sunroof motor assembly. Measure the voltage at sunroof motor assembly connector D-35.





(1)Disconnect sunroof motor assembly connector D-35 and measure the voltage available at the wiring harness side of the connector.
(2)Turn the ignition switch to the "ON" position.





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

- The voltage should measure approximately 12 volts (battery positive voltage).

Q. Is the measured voltage approximately 12 volts (battery positive voltage)?

YES Go to Step 6.

NO Go to Step 5.

STEP 5. Check the wiring harness between sunroof motor assembly connector D-35 (terminal 3) and ignition switch (IG2).

- Check the power supply line for open circuit and short circuit.









NOTE:
Also check junction block connectors C-202, C-209 and intermediate connector D-29 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-202, C-209 or intermediate connector D-29 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between sunroof motor assembly connector D-35 (terminal 3) and the ignition switch (IG2) in good condition?

YES Inspection Procedure.

NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Check that the sunroof works normally.

STEP 6. Check the ground circuit to the sunroof motor assembly. Measure the resistance at sunroof motor assembly connector D-35.





(1)Disconnect sunroof motor assembly connector D-35 and measure the resistance available at the wiring harness side of the connector.





(2)Measure the resistance value between terminal 4 and ground.

- The resistance should be 2 ohms or less.

Q. Is the measured resistance 2 ohms or less?

YES Go to Step 8.

NO Go to Step 7.

STEP 7. Check the wiring harness between sunroof motor assembly connector D-35 (terminal 4) and ground.

- Check the ground wire for open circuit.





Q. Is the wiring harness between sunroof motor assembly connector D-35 (terminal 4) and ground in good condition?

YES No action is necessary and testing is complete.

NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Check that the sunroof works normally.

STEP 8. Check the sunroof switch connector D-32 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is sunroof switch connector D-32 in good condition?

YES Go to Step 9.

NO Repair or replace the damaged component(s). Harness Connector Inspection. Check that the sunroof works normally.

STEP 9. Check the sunroof switch.





Check continuity when the sunroof switch is operated to "OPEN", "TILT UP" or "CLOSE/TILT DOWN" positions. Testing and Inspection.





Q. Does the check meet the specified conditions?

YES Go to Step 10.

NO Replace the sunroof switch. Check that the sunroof works normally.

STEP 10. Check the ground circuit to the sunroof switch. Measure the resistance at sunroof switch connector D-32.





(1)Disconnect sunroof switch connector D-32 and measure the resistance available at the wiring harness side of the connector.





(2)Measure the resistance between terminal 4 and ground.

- The resistance should be 2 ohms or less.

Q. Is the measured resistance 2 ohms or less?

YES Go to Step 12.

NO Go to Step 11.

STEP 11. Check the wiring harness sunroof switch connector D-32 (terminal 4) and ground.

- Check the ground wire for open circuit.





Q. Is the wiring harness between sunroof switch connector D-32 (terminal 4) and ground in good condition?

YES No action is necessary and testing is complete.

NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Check that the sunroof works normally.

STEP 12. Check the wiring harness between sunroof motor assembly connector D-35 (terminals 8, 9 and 10) and sunroof switch connector D-32 (terminals 5, 3 and 6).

- Check the communication lines for open circuit and short circuit.





Q. Is the wiring harness between sunroof motor assembly connector D-35 (terminals 8, 9 and 10) and sunroof switch connector D-32 (terminals 5, 3 and 6) in good condition?

YES Go to Step 13.

NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Check that the sunroof works normally.

STEP 13. Replace the sunroof switch.

(1)Replace the sunroof switch.

(2)Check that the sunroof works normally.

Q. Does the sunroof works normally?

YES No action is necessary and testing is complete.
NO Replace the sunroof motor assembly. Check that the sunroof works normally.