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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).
- 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: Harness Set




STEP 1. Check sunroof motor assembly connector D-08 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is the sunroof motor assembly connector D-08 in good condition?

YES: Go to Step 2.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that the sunroof function should work now normally.

STEP 2. Check the battery power supply circuit to the sunroof motor assembly. Measure the voltage at sunroof motor assembly connector D-08.




1. Measure the voltage available at the harness side of sunroof motor assembly connector D-08 without disconnecting it.




2. Measure the voltage between terminal 1 and ground.
- 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 wiring harness between sunroof motor assembly connector D-08 (terminal 1) and fusible link (5).









NOTE: Also check intermediate connectors C-116 and C-218 for loose, corroded or damaged terminals, or terminals pushed back in the connectors. If intermediate connector C-116 or C-218 is damaged, repair or replace the damaged components) as described in Harness Connector Inspection.

Q: Is the wiring harness between sunroof motor assembly connector D-08 (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. Verify that the sunroof function should work now normally.

STEP 4. Check the battery power supply circuit to the sunroof motor assembly. Measure the voltage at sunroof motor assembly connector D-08.




1. Measure the voltage available at the harness side of sunroof motor assembly connector D-08 without disconnecting it.
2. Turn the ignition switch to "ON" position.




3. Measure the voltage between terminal 2 and ground.
- 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 wiring harness between sunroof motor assembly connector D-08 (terminal 2) and ignition switch (IG2).






NOTE: Also check junction block connectors C-203 and C-210 for loose, corroded or damaged terminals, or terminals pushed back in the connectors. If junction block connector C-203 or C-210 are damaged, repair or replace the damaged components) as described in Harness Connector Inspection.

Q: Is the wiring harness between sunroof motor assembly connector C-08 (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. Verify that the sunroof function should work now normally.

STEP 6. Check the ground circuit to the sunroof motor assembly. Measure the resistance at sunroof motor assembly connector D-08.




1. Measure the resistance available at the harness side of sunroof motor assembly connector D-08 without disconnecting it.




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 8.

NO: Go to Step 7.




STEP 7. Check the wiring harness between sunroof motor assembly connector D-08 (terminal 5) and ground.

Q: Is the wiring harness between sunroof motor assembly connector D-08 (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. Verify that the sunroof function should work now normally.




STEP 8. Check 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 9.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that the sunroof function should work now normally.







STEP 9. Check the sunroof switch.

Q: Does the check above meet the values in the table?

YES: Go to Step 10.

NO: Replace the sunroof switch. Verify that the sunroof function should work now normally.

STEP 10. Check the ground circuit to the sunroof switch. Measure the resistance at sunroof switch connector D-05.




1. Disconnect the sunroof switch connector D-05 and measure at the harness side.




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 function should work now normally.

NO: Go to Step 11.




STEP 11. Check the harness wire between sunroof switch connector D-05 (terminal 4) and ground.

Q: Is the wiring harness 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. Verify that the sunroof function should work now normally.
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