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Inspection Procedure F-1

Sunroof: Sunroof does not Operate.

Sunroof Motor Assembly Power Supply Circuit Part 1:




Sunroof Motor Assembly Power Supply Circuit Part 2:






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 Tool:
- MB991223: Test Harness Set




STEP 1. Check the sunroof motor assembly connector D-06 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is sunroof motor assembly connector D-06 in good condition?

YES: Go to Step 2.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. The sunroof should now work normally.

STEP 2. Check the sunroof motor assembly power supply circuit fusible link (5) at the sunroof motor assembly connector D-06 by backprobing.




1. Do not disconnect the sunroof motor assembly connector D-06.




2. Measure the voltage between terminal 1 and ground by backprobing.
- The voltage should equal 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 harness wires between sunroof motor assembly connector D-06 (terminal 1) and fusible link (5).

NOTE: Also check intermediate connectors C-31 and C-89 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-31 or C-89 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Are the harness wires between sunroof motor assembly connector D-06 (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. The sunroof should now work normally.

STEP 4. Check the sunroof motor assembly power supply circuit (battery) at the sunroof motor assembly connector D-06 by backprobing.




1. Do not disconnect the sunroof motor assembly connector D-06.




2. Measure the voltage between terminal 3 and ground by backprobing.
- The voltage should equal 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 harness wires between sunroof motor assembly connector D-06 (terminal 3) and battery.

NOTE: Also check intermediate connectors C-31, C-89 and joint connector C-78 for loose, corroded, or damaged terminals, or terminals pushed back in the connector, check the wires. If intermediate connectors C-31, C-89 or joint connector C-78 are damaged, Repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Are the harness wires between sunroof motor assembly connector D-06 (terminal 3) and battery 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. The sunroof should now work normally.

STEP 6. Check the sunroof motor assembly power supply circuit ignition switch (IG2) at the sunroof motor assembly connector D-06 by backprobing.




1. Do not disconnect the sunroof motor assembly connector D-06.
2. Turn the ignition switch to "ON" position.




3. Measure the voltage between terminal 2 and ground by backprobing.
- The voltage should equal approximately 12 volts (battery positive voltage).

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

YES: Go to Step 8.

NO: Go to Step 7.







STEP 7. Check the harness wires between sunroof motor assembly connector D-06 (terminal 2) and ignition switch (IG2).

NOTE: Also check junction block connectors C-102 and C-111 for loose, corroded, or damaged terminals, or terminals pushed back in the connector, check the wires. If junction block connector C-102 or C-111 are damaged, Repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Are the harness wires between sunroof motor assembly connector C-06 (terminal 2) and ignition switch (IG2) 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. The sunroof should now work normally.

STEP 8. Check the ground circuit to the sunroof switch. Measure the resistance at sunroof switch connector D-06.




1. Disconnect sunroof switch connector D-06 and measure the resistance available at the wiring component side of the connector.




2. Measure the resistance between terminal 5 and ground.
- The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 10.

NO: Go to Step 9.




STEP 9. Check the harness wire between sunroof motor assembly connector D-06 (terminal 5) and ground.

Q: Is the harness wire between sunroof motor assembly connector D-06 (terminal 5) 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. The sunroof should now work normally.




STEP 10. Check the sunroof switch connector D-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is sunroof switch connector D-05 in good condition?

YES: Go to Step 11.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. The sunroof should now work normally.







STEP 11. Check the sunroof switch.

Q: Does the check above meet the table?

YES: Go to Step 12.

NO: Replace the sunroof switch. The sunroof should now work normally.

STEP 12. Check the ground circuit to the sunroof switch. Measure the resistance at sunroof switch connector D-05




1. Disconnect sunroof switch connector D-05 and measure the resistance available at the wiring component side of the connector.




2. Measure the resistance between terminal 4 and ground.
- The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES: Replace the sunroof motor assembly. The sunroof should now work normally.

NO: Go to Step 13.




STEP 13. Check the harness wire between sunroof switch connector D-05 (terminal 4) and ground.

Q: Is the harness wire between sunroof switch connector D-05 (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. The sunroof should now work normally.
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