Inspection Procedure O-10

Sunroof Switch: 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
- Malfunction of the sunroof switch
- Malfunction of the sunroof motor assembly
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicles communication interface
- MB991827: MUT-III USB cable
- MB991911: MUT-III Main harness B
- MB991813: SWS monitor kit
- MB991806: SWS monitor cartridge
- MB991812: SWS monitor harness (for column-ECU)
- MB991922: Probe harness

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."







STEP 2. Check sunroof motor assembly connector D-06 and ETACS-ECU connector C-118 for damage.

Q: Are sunroof motor assembly connector D-06 and ETACS-ECU connector C-118 in good condition?

YES: Go to Step 3.

NO: Repair or replace the connector. 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-06 (terminal 10) and ETACS-ECU connector C-118 (terminal 59).

NOTE: Also check intermediate connectors C-31 and joint connector C-78. If intermediate connector C-31 or joint connector C-78 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between sunroof motor assembly connector D-06 (terminal 10) and ETACS-ECU connector C-118 (terminal 59) in good condition?

YES: Go to Step 4.

NO: Repair the wiring harness. If the sunroof operates normally, it indicates that a correct signal is sent from the sunroof switch.

STEP 4. Replace the ECU.

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 to be taken.

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