Inspection Procedure M-9

INSPECTION PROCEDURE M-9: Sunroof Switch: ETACS-ECU does not receive any signal from the up, open or close/down switch.


















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

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check 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 Inspection Procedure F-1."
STEP 2. Check sunroof motor assembly connector D-35 and ETACS-ECU connector C-218 for loose, corroded or damaged terminals, or terminals pushed back in the connector.









Q. Are sunroof motor assembly connector D-35 and ETACS-ECU connector C-218 in good condition?

YES Go to Step 3.

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

STEP 3. Check the wiring harness between sunroof motor assembly connector D-35 (terminal 6) and ETACS-ECU connector C-218 (terminal 59).

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













NOTE:
Also check intermediate connectors C-27, D-29 and joint connector C-01. If intermediate connector C-27, D-29 or joint connector C-01 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between sunroof motor assembly connector D-35 (terminal 6) and ETACS-ECU connector C-218 (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, 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, 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. When the ETACS-ECU is replaced, register the encrypted code. Encrypted Code Registration Criteria Table. If the sunroof operates normally, a correct signal is sent from the sunroof switch.