Inspection Procedure 3

INSPECTION PROCEDURE 3: When the selector lever is moved to "R" position during the rear wiper operation, the rear wiper does not operate at the continuous mode.






CIRCUIT OPERATION

The ETACS-ECU operates the rear wiper consecutively when the selector lever is moved to "R"
position while the rear wiper is turned on.

TECHNICAL DESCRIPTION (COMMENT)

If the rear wiper does not work consecutively, the transmission range switch ("R" position) or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS

- The back-up light switch may be defective

- The ETACS-ECU may be defective

- The wiring harness may be damaged or the connectors may have loose, corroded or damaged terminals, pushed back in the connector

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set

- MB992006: Extra Fine Probe

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles communication interface (V.C.I.)

- MB991827: M.U.T.-III USB cable

- MB991911: M.U.T.-III Main harness B

STEP 1. Verify the rear wiper.

Check that the rear wiper system works normally by operating the rear wiper switch.

Q. Does the rear wiper operate?

YES Go to Step 2.
NO [Rear wiper does not work.] : Refer to Inspection Procedure 1 "Rear wiper does not work at all Inspection Procedure 1."
STEP 2. Use the scan tool MB991958 to diagnose the CAN bus lines.





Connect the scan tool. Reading and Clearing Diagnostic Trouble Codes."

Q. Is the check result normal?

YES Go to Step 3.

NO Repair the CAN bus line CAN Bus Diagnostics Chart).

STEP 3. Use the scan tool MB991958 to diagnose other system diagnostic trouble code

Connect the scan tool. Reading and Clearing Diagnostic Trouble Codes."

Check that the TCM sets a bus-off diagnostic trouble code.

Q. Is the diagnostic trouble code set?

YES A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the TCM and the ETACS-ECU How to Cope With Intermittent Malfunctions.
NO Go to Step 4.
STEP 4. Retest the system.

Check that the rear wiper operates continuously when the selector lever is moved to the R position during the rear wiper operation.

Q. Is the check result normal?

YES Intermittent malfunction. How to Cope With Intermittent Malfunctions.
NO Replace the ETACS-ECU.