Inspection Procedure F-3

Sunroof: Sunroof timer function does not work normally.

NOTE: This troubleshooting procedure requires the use of scan tool MB991502 or MB991958 and SWS monitor kit MB991813. For details on how to use the SWS monitor, refer to "How to use SWS monitor."

Sunroof Timer Function:

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

- Vehicle condition
- Ignition switch: LOCK position
- Driver'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)
If the function does not work normally, the input circuit system from the switches, the sunroof motor assembly or the ETACS-ECU may be defective (refer to "CIRCUIT OPERATION").

TROUBLESHOOTING HINTS
- The driver's door switch may be defective
- The sunroof-ECU 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
- MB991502: Scan Tool (MUT-II)
- MB991496: Main unit
- MB991497: Test Harness (for communication)

- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991911: 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 MB991502 or MB991958 to select "ECU COMM Check" on the SWS monitor display.
Check the following ECUs.
- ETACS-ECU
- Sunroof motor assembly (sunroof-ECU)

CAUTION To prevent damage to scan tool MB991502 or MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502 or MB991958. Connect special tool MB991497 or MB991911 before connecting special tool MB991812. Be sure to connect special tool MB991806 after turning on special tool MB991496 or MB991824.







1. Connect the special tool. Refer to "How to connect SWS monitor."
2. Turn the ignition switch to the "LOCK" (OFF) position.
3. Operate scan tool MB991502 or 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 MB991502 or MB991958 should show "OK" on the "ECU COMM Check" menu for the "ETACS ECU" and the "SUNROOF ECU" menus.

Q: Is "OK" displayed on both the "ETACS ECU" and "SUNROOF ECU" menu?

"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 the ETACS-ECU is not possible."

"NG" is displayed on the "SUNROOF ECU" menu: Refer to Inspection Procedure A-5 "Communication with the sunroof motor assembly (sunroof-ECU) is not possible."

STEP 2. Check the input signal by using "Function Diag." menu of the SWS monitor.




1. Check the input signals from the following the ignition switch to the "OFF" position.
2. Operate scan tool MB991502 or MB991958 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."




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

Q: Does scan tool MB991502 or MB991958 display the items "IG SW (IG1)" and "S/R ECU ACK" as normal condition?

Normal conditions are displayed for all the items: Replace the ETACS-ECU. Verify that the sunroof timer function should now work normally.

Normal condition is not displayed on the "IG SW (IG1)": Refer to Inspection Procedure N-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 (Refer to Sunroof). Verify that the sunroof timer function should now work normally.