Inspection Procedure G-6

Windshield Wiper and Washer: The windshield intermittent wiper interval is not changed according to the vehicle speed.

Windshield Intermittent Wiper Circuit:

TECHNICAL DESCRIPTION (COMMENT)
If the windshield intermittent wiper interval is not changed according to the vehicle speed, the ETACS-ECU or the front-ECU may be defective.

TROUBLESHOOTING HINTS
- The ETACS-ECU may be defective
- The front-ECU 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: Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness B
- MB991862: SWS monitor kit

STEP 1. Check the input signal (by using the pulse check mode of the monitor).
Check the input signals from the vehicle speed sensor or the vehicle speed signal .

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.

1. Connect scan tool MB991958 to the data link connector.
2. Operate scan tool MB991958 according to the procedure below to display "PULSE CHECK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."

3. Check that scan tool MB991958 sounds when the vehicle speed exceeds 10 km/h (6.2 mph).

Q: Does scan tool MB991958 sound when the vehicle speed exceeds 10 km/h (6.2 mph)?

YES: Go to Step 2.

NO: Refer to Inspection Procedure O-8 "ETACS-ECU does not receive a signal from the vehicle speed sensor " or "ETACS-ECU does not receive a signal from the vehicle speed signal ."

STEP 2. Check the input signal by using "FUNCTION DIAG." menu of the SWS monitor.
Set each switch to the following condition to check input signals from the windshield intermittent wiper interval adjusting knob:
- Ignition switch: ACC
- Windshield wiper switch: INT
- Intermittent wiper adjusting knob: SLOW side

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 the DLC harness before connecting the column-ECU harness. Be sure to connect SWS monitor kit MB991862 after turning on scan tool MB991958.

1. Connect SWS monitor kit MB991862 to the column switch connector.
2. Operate scan tool MB991958 according to the procedure below to display "F.WIPER INT."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAG."
5. Select "WIPER."
6. Select "F.WIPER INT."

3. Check that normal conditions are displayed on the items described in the table.

NOTE: Also check that the wiper interval changes smoothly when the vehicle is accelerated from 0 km/h (0 mph) to 25 km/h (15.5 mph).

Q: Does the value change within the normal range when the windshield intermittent wiper interval adjusting knob is rotated?

YES: Replace the front-ECU. The windshield intermittent wiper interval should change according to the vehicle speed.

NO: Replace the ETACS-ECU. The windshield intermittent wiper interval should change according to the vehicle speed.