INSPECTION PROCEDURE 5: The windshield intermittent wiper interval cannot be adjusted by operating the windshield intermittent wiper interval control switch: 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. Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set.
Connect the scan tool. Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ."
Q: Is the diagnostic trouble code set?
- YES: Diagnose the ETACS-ECU. Refer to DIAGNOSTIC TROUBLE CODE TABLE ."
- NO: Go to STEP 2 below.
- 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 below.
- NO: Use the ETACS customization function to set "Front wiper operation" to "variable INT" or "Speed sensitive". (Refer to INTELLIGENT WASHER FUNCTION .)
- STEP 3. Using scan tool MB991958, check data list.
Check the input signal related to the windshield wiper operation.
- Ignition switch: ACC
- Rotate the windshield wiper interval control from (+) to (-) side.
Item No. Display on scan tool Check conditions Normal condition Item 359 Front wiper (interval volume) Rotate the windshield wiper interval control from (+) to (-) side. Value changes from (+) to 254 (-) OK: Normal condition is displayed.
Q: Is the check result normal?
- NO: Go to STEP 4 below.
- YES: Replace the column switch.
- STEP 4. Retest the system.
Check that the windshield wiper interval changes when the windshield wiper interval control is rotated.
Q: Is the check result normal?
- YES: Intermittent malfunction. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .
- NO: Replace the ETACS-ECU.