Inspection Procedure F-3

INSPECTION PROCEDURE F-3: Sunroof: Sunroof timer function does not work normally.

NOTE:
This troubleshooting requires use of scan tool MB991958 and SWS monitor kit MB991813. For details of 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
- Door switch (LH): OFF

- Vehicle condition
- Ignition switch: LOCK position
- Door (LH): Closed

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

TECHNICAL DESCRIPTION (COMMENT)

If 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 front 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: Test Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
- MB991813: SWS Monitor Kit
- MB991806: SWS Monitor Cartridge
- MB991812: SWS Monitor Harness (For Column-ECU)
- MB991822: 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-ECU









(1)
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.

Connect the special tool. Refer to "How to connect SWS monitor How to Connect SWS Monitor."
(2)Turn the ignition switch to the "ON" position.
(3)Operate the scan tool MB991958 according to the procedure below to display "ECU COMM Check."

.....Select "Interactive Diagnosis."

.....Select "System select."

.....Select "SWS."

.....Select "SWS MONITOR."

.....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. Are "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 for the "ETACS ECU" menu : Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible Inspection Procedure A-3."

"NG" is displayed for the "SUNROOF ECU" menu : Refer to Inspection Procedure A-5 "Communication with the sunroof-ECU is not possible Inspection Procedure A-5."

STEP 2. Check the input signal by using "DATA LIST" 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 scan tool MB991958 according to the procedure below to display "ETACS."

.....Select "Interactive Diagnosis."

.....Select "System select."

.....Select "SWS."

.....Select "SWS MONITOR."

.....Select "Data List."

.....Select "ETACS."
(2)Check that normal condition are displayed for the item described in the table below.





(3)Operate scan tool MB991958 according to the procedure below to display "Front-ECU, P/W, S/R."

.....Select "Interactive Diagnosis."

.....Select "System select."

.....Select "SWS."

.....Select "SWS MONITOR."

.....Select "Data List."

.....Select "Front-ECU, P/W, S/R."
(4)Check that normal condition are displayed for the item described in the table below.





Q. Does the M.U.T.-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. Check that the sunroof timer function works normally.

Normal condition is not displayed for the "IG SW (IG1)" : Refer to Inspection Procedure M-2 "ETACS-ECU does not receive a signal from the ignition switch (IG1) Inspection Procedure M-2."

Normal condition is not displayed for the "S/R ECU ACK" : Replace the sunroof motor assembly. Check that the sunroof timer function works normally.