Inspection Procedure 6

INSPECTION PROCEDURE 6: The windshield intermittent wiper interval is not changed according to the vehicle speed.

Windshield Intermittent Wiper Control Circuit:

TECHNICAL DESCRIPTION (COMMENT)
If the intermittent wiper interval does not depend on the vehicle speed, the input circuit of the vehicle speed signal and the ETACS-ECU may be defective. Alternatively, the vehicle speed-dependent wiper may be set to "disabled" by using the configuration function.

TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The CAN bus line may be defective
- The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tools:
- MB991223: 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

STEP 1.Retest the system.

Check that the windshield intermittent wiper interval can be adjusted by operating the windshield intermittent wiper interval control switch.

Q: Is the check result normal?

YES : Go to Step 2.

NO : Refer to Inspection Procedure 5 "The windshield intermittent wiper interval cannot be adjusted by operating the windshield intermittent wiper interval control switch".

STEP 2.Check the ETACS configuration function.

Use the ETACS configuration function to check that "Front wiper operation" is set to "Variable INT" or "Speed sensitive".

Q: Is the check result normal?

YES : Go to Step 3.

NO : Use the ETACS configuration function to set "Front wiper operation" to "variable INT" or "Speed sensitive".

STEP 3.Use the scan tool MB991958 to diagnose the CAN bus lines.






Connect the scan tool. Refer to Chassis Electrical ETACS, "How to connect the scan tool (M.U.T-III)."

Q: Is the check result normal?

YES (CVT) : Go to Step 4

YES (M/T) : Go to Step 5.

NO : Repair the CAN bus line (Refer to Controller Area Network-CAN bus diagnosis chart).

STEP 4.Use the scan tool MB991958 to diagnose other system diagnostic trouble code

Connect the scan tool. Refer to Chassis Electrical ETACS, "Diagnostic function." Check that the TCM sets a diagnostic trouble code.

Q: Is the diagnostic trouble code set?

YES : Diagnose the TCM (Refer to Transmission Control Systems).

NO : Go to Step 6.

STEP 5.Use the scan tool MB991958 to diagnose other system diagnostic trouble code

Connect the scan tool. Refer to Chassis Electrical ETACS, "Diagnostic function." Check that the ECM sets a diagnostic trouble code.

Q: Is the diagnostic trouble code set?

YES : Diagnose the ECM (Refer to MFI - Diagnostic trouble code chart).

NO : Go to Step 6.

STEP 6.Retest the system.

Check that the intermittent wiper interval depends on the vehicle speed.

Q: Is the check result normal?

YES : Intermittent malfunction. Refer to General (Body and Chassis), How to cope with intermittent malfunction.

NO : Replace the ETACS-ECU.