Step 1. ECU check by using the SWS monitor

Check that the power supply and earth lines to the sunroof motor assembly (sunroof-ECU) and the ETACS-ECU and the SWS communication lines are normal.

• Ignition switch: ON

• Operate the sunroof switch.

ECUS TO BE CHECKED

• ETACS ECU

• SUNROOF ECU

OK: "OK" are displayed for all the items.

Q: Is the check result normal?

"OK" are displayed for all the items:  Go to Step 2.
"NG" is displayed on the "ETACS ECU" menu.:  Refer to Inspection Procedure A-3 "Communication with ETACS-ECU is not possible ."
"NG" is displayed on the "SUNROOF ECU" menu.:  Refer to Inspection Procedure A-6 "Communication with sunroof motor assembly (sunroof-ECU) is not possible ."

Step 2. Function diagnosis by using the SWS monitor

Check the SWS communication signal, which are related to the sunroof.

<Selected item> SUNROOF OPE

• Ignition switch: ON

Item No.	Item name	Normal condition
Item 30	IG SW(IG1)	ON
Item 72	S/R ECU ACK	INPUT CHECK (only momentarily when switch is operated)

OK: Normal conditions displayed for all the items.

Q: Is the check result normal?

Normal conditions are displayed for all the items.:  Go to Step 3.
Normal condition is not displayed for item No.30:  Refer to Inspection Procedure P-2 "The ignition switch (IG1) signal is not received ."
Normal condition is not displayed for item No.72:  Replace the sunroof motor assembly.

Step 3. Connector check: D-06 sunroof switch connector

Q: Is the check result normal?

YES:  Go to Step 4.
NO:  Repair the connector.

Step 4. Check the sunroof switch.

Refer to GROUP 42 - Sunroof .
YES:  Go to Step 5.
NO:  Replace the sunroof switch.

Step 5. Measure the resistance at the D-06 sunroof switch connector.

1. Disconnect the connector, and measure at the wiring harness side.

2. Continuity between D-06 sunroof switch connector terminal No.4 and body earth
OK: 2Ω or less

Q: Is the check result normal?

YES:  Go to Step 7.
NO:  Go to Step 6.

Step 6. Check the wiring harness between D-06 sunroof switch connector terminal No.4 and body earth.

NOTE: Prior to the wiring harness inspection, check intermediate connector C-218 <R.H. drive vehicles> , and repair if necessary.

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.

Step 7. Connector check: D-09 sunroof motor assembly connector

Q: Is the check result normal?

YES:  Go to Step 8.
NO:  Repair the connector.

Step 8. Measure the voltage at the D-09 sunroof motor assembly connector.

1. Disconnect the sunroof motor assembly connector, and measure at the harness side.

2. Check the voltage between the D-09 sunroof motor assembly connector terminal No.1 and body earth.
OK: Battery positive voltage

Q: Is the check result normal?

YES:  Go to Step 10.
NO:  Go to Step 9.

Step 9. Check the wiring harness between D-09 sunroof motor assembly connector terminal No.1 and the fusible link (5).

NOTE: Prior to the wiring harness inspection, check intermediate connectors A-14 <R.H. drive vehicles>, C-116 <L.H. drive vehicles>, C-126 <R.H. drive vehicles> and C-218, and repair if necessary.

• Check the power supply line to the battery for open circuit.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.

Step 10. Measure the voltage at the D-09 sunroof motor assembly connector.

1. Disconnect the sunroof motor assembly connector, and measure at the harness side.

2. Ignition switch: ON

3. Check the voltage between the D-09 sunroof motor assembly connector terminal No.2 and body earth.
OK: Battery positive voltage

Q: Is the check result normal?

YES:  Go to Step 12.
NO:  Go to Step 11.

Step 11. Check the wiring harness between D-09 sunroof motor assembly connector terminal No.2 and the ignition switch (IG2).

NOTE: Prior to the wiring harness inspection, check junction block connectors C-203 and C-210, and repair if necessary.

• Check the power supply line to the ignition switch (IG2) for open circuit.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.

Step 12. Measure the resistance at the D-09 sunroof motor assembly connector.

1. Disconnect the sunroof motor assembly connector, and measure at the harness side.

2. Check the resistance between D-09 sunroof motor assembly connector terminal No.5 and body earth.
OK: 2Ω or less

Q: Is the check result normal?

YES:  Go to Step 14.
NO:  Go to Step 13.

Step 13. Check the wiring harness between D-09 sunroof motor assembly connector terminal No.5 and body earth.

NOTE: Prior to the wiring harness inspection, check intermediate connector C-218 <R.H. drive vehicles>, and repair if necessary.

• Check body earth line for open circuit.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.

Step 14. Retest the system.

The sunroof assembly should now work normally.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Replace the sunroof motor assembly.