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."
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 network 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
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991911: M.U.T.-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 Check" 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 MB991911 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."
2. Turn the ignition switch to the "LOCK" (OFF) position.
3. Operate 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" menu for the "ETACS ECU" and the "SUNROOF ECU" menus.
Q: Is "OK" displayed on both the "ETACS ECU" and "SUNROOF ECU" menu?
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 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 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 MB991958 display the items "IG SW (IG1)" and "S/R ECU ACK" as normal condition?
YES
NO
NO