Inspection Procedure F-3

Sunroof: Sunroof Timer Function does not Work Normally.

Sunroof Timer Function:

NOTE: This troubleshooting procedure requires the use of scan tool MB991958 and SWS monitor kit MB991813. For details on how to use the SWS monitor, refer to "How to use SWS monitor." How To Use SWS Monitor

CIRCUIT OPERATION
- The sunroof timer function works according to the signals from the following switches:
- Ignition switch (IG1): OFF
- Driver's and passenger's door switch: OFF

- Vehicle condition
- Ignition switch: LOCK position
- Driver's and passenger's door: Closed

- When a front door is opened and closed while the sunroof timer function is on, the sunroof operative duration will be changed.

TECHNICAL DESCRIPTION (COMMENT)
Is the sunroof timer function does not work normally, the input circuits from the switches described in "CIRCUIT OPERATION", the sunroof motor assembly, the ETACS-ECU or the SWS communication line may be defective.

TROUBLESHOOTING HINTS
- The driver's or passenger's door 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 Tools:
- MB991223: Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicles communication interface (V.C.I.)
- 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. Use scan tool MB991958 to select "ECU COMM CHK" on the SWS monitor display.
Check the following ECUs:
- ETACS-ECU
- Sunroof motor assembly (sunroof-ECU)

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect special tool MB991910 before connecting special tool MB991812. Be sure to connect special tool MB991806 after turning on special tool MB991824.







1. Connect the special tool. Refer to "How to connect SWS monitor." How to Connect SWS Monitor
2. Turn the ignition switch to the "LOCK" (OFF) position.
3. Operate the scan tool MB991958 according to the procedure below to display "ECU COMM Check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "ECU COMM Check."

4. Scan tool MB991958 should show "OK" on the "ECU COMM Check" menus for both the "ETACS ECU" and the "SUNROOF ECU" menus.

Q: Is "OK" displayed for both the "ETACS ECU" and "SUNROOF ECU" menus?

"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-5 "Communication with sunroof motor (sunroof-ECU) is not possible."

STEP 2. Check the input signal by using "FUNCTION DIAG." menu of the SWS monitor.
Observe how the input signal is changed when the ignition switch is turned from the ON position to the "LOCK" (OFF) position.







1. Operate the MUT-III according to the procedure below to display "SUNROOF-OPE."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "SUNROOF."
g. Select "SUNROOF-OPE."




2. Check that normal conditions are displayed on the items described in the table.

Q: Does the MUT-III display the items "IG SW (IG1)" and "S/R ECU ACK" as normal condition?

Normal conditions displayed for all the items: Replace the sunroof motor assembly. Verify that the sunroof timer function works normally.
Normal condition is not displayed on the "IG SW(IG1)": Refer to Inspection Procedure O-2 "ETACS-ECU does not receive a signal from the ignition switch (IG1)."
Normal condition is not displayed on the "S/R ECU ACK": Replace the sunroof motor assembly. Verify that the sunroof timer function works normally.