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 customization function.

TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The combination meter 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". Inspection Procedure 5

STEP 2. Check the ETACS customization function.
Use the ETACS customization 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 customization function to set "Front wiper operation" to "variable INT" or "Speed sensitive".

STEP 3. Using scan tool MB991958, check data list.







Check the input signal related to the combination meter.
- Drive the vehicle and change vehicle speed.







Q: Is the check result normal?

YES: Go to Step 4.

NO: [Normal condition is not displayed for item No. 80.]: Troubleshoot the speedometer (Refer to chassis electrical) The combination meter, Diagnosis - Inspection Procedure 2: "The speedometer does not work (the other meters work)".

STEP 4. 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.