Inspection Procedure F-3
Sunroof: Sunroof timer function does network 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
If the sunroof timer function does not work, the input circuit from the ignition switch (IG1) or the driver's door switch, the communication lines between the ETACS-ECU and the sunroof motor assembly (sun-roof-ECU), the sunroof motor assembly (sun-roof-ECU) or the ETACS-ECU may be defective.
TECHNICAL DESCRIPTION (COMMENT)
If the sunroof timer function does network 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: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991910: MUT-III Main Harness A
- MB991813: SWS Monitor Kit
- MB991806: SWS Monitor Cartridge
- MB991812: SWS Monitor Harness (For Column-ECU)
- MB991822: Probe Harness
- MB991854: SWS Monitor Harness (For 13-pin)
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.
1. Connect scan tool MB991958 to the data link connector (16-pin).
2. Connect SWS monitor harness MB991854 to the data link connector (13-pin).
3. Turn the ignition switch to the "ON" position.
4. Operate the scan tool MB991958 according to the procedure below to display "ECU COMM CHECK."
a. Select "SYSTEM SELECT."
b. Select "SWS."
c. Select "SWS MONITOR."
d. Select "ECU COMM CHK".
5. Scan tool MB991958 should show "OK" on the "ECU COMM CHK" menus for the ETACS ECU and SUNROOF ECU menus.
Q: Is "OK" displayed on the "ETACS ECU" and "SUNROOF ECU" menus?
YES <"OK" are displayed for all the items>: Go to Step 2.
NO <"NG" is displayed on the "ETACS ECU" menu>: Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible."
NO <"NG" is displayed on the "SUNROOF ECU" menu>: Refer to Inspection Procedure A-5 "Communication with the sunroof motor (sunroof-ECU) is not possible."
STEP 2. Check the input signal by using "FUNCTION DIAG." menu of the SWS monitor.
1. Turn the ignition switch to the "OFF" position to check the input signals from the following switches.
2. Operate the scan tool MB991958 according to the procedure below to display "SUNROOF-OPE."
a. Select "SYSTEM SELECT."
b. Select "SWS."
c. Select "SWS MONITOR."
d. Select "FUNCTION DIAG."
e. Select "SUNROOF."
f. Select "SUNROOF-OPE."
3. Check that normal conditions are displayed on the items described in the table.
Q: Are normal conditions displayed on the "IG SW (IG1)" and "S/R ECU ACK"?
YES
NO
NO