Inspection Procedure N-9

Sunroof: The ETACS-ECU does not receive any signal from the up, open or close/down switch.

Sunroof Switch Input Circuit Part 1:

Sunroof Switch Input Circuit Part 2:

CIRCUIT OPERATION
The ETACS-ECU receives a signal through the sunroof motor assembly via the SWS communication line from the sunroof switch, and sends a signal to the data link connector.

TECHNICAL DESCRIPTION (COMMENT)
If the SWS communication line between the sunroof motor assembly and the ETACS-ECU is defective, the ETACS-ECU cannot identify the input signal from the sunroof switch even if the sunroof is normal.

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.
- The ETACS-ECU may be defective.

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Verify the sunroof operation.

Q: Does the sunroof work normally?

YES: Go to Step 2.

NO: Refer to Inspection Procedure F-1 "Sunroof does not operate."







STEP 2. Check sunroof motor assembly connector D-32 and ETACS-ECU connector C-228 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are sunroof motor assembly connector D-32 and ETACS-ECU connector C-228 in good condition?

YES: Go to Step 3.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. If the sunroof operates normally, it indicates that a correct signal is sent from the sunroof switch.










STEP 3. Check the wiring harness between sunroof motor assembly connector D-32 (terminal 10) and ETACS-ECU connector C-228 (terminal 59).

NOTE: Also check intermediate connector C-18 and joint connector C-101 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-18 or joint connector C-101 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between sunroof motor assembly connector D-32 (terminal 10) and ETACS-ECU connector C-228 (terminal 59) in good condition?

YES: Go to Step 4.

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. If the sunroof operates normally, it indicates that a correct signal is sent from the sunroof switch.

STEP 4. Replace the sunroof motor assembly.

1. Replace the sunroof motor assembly.
2. If the sunroof operates normally, it indicates that a correct signal is sent from the sunroof switch.

Q: Does the ETACS-ECU receive correct signals from the sunroof switch?

YES: No action is necessary and testing is complete.

NO: Replace the ETACS-ECU. If the sunroof operates normally, it indicates that a correct signal is sent from the sunroof switch.