Inspection Procedure G-6
Windshield Wiper And Washer: The Windshield Intermittent Wiper Interval Is Not Changed According To The Vehicle Speed.NOTE: This troubleshooting requires use of scan tool MB991502 and SWS monitor kit MB991862. For details of how to use the SWS monitor, refer to "How to use SWS monitor."
Windshield Intermittent Wiper Interval Adjusting Knob 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
- Malfunction of the ETACS-ECU
- Malfunction of the front-ECU
- Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991862: SWS Monitor Kit
STEP 1. Check the input signal (by using the Pulse check).
Check the input of the vehicle speed signal:
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector.
2. Operate the MUT-II 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 MB991502 sounds when the vehicle speed exceeds 10 km/h (6.2 mph).
Q: Does scan tool MB991502 sound when the vehicle speed exceeds 10 km/h (6.2 mph)?
YES: Go to Step 2.
NO: Refer to Inspection Procedure P-11 "vehicle speed signal is not input to ETACS-ECU
STEP 2. Check the input signal by using "FUNCTION DIAGNOSIS" 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 control: slow side (mph)
CAUTION: Also connect SWS monitor kit MB991862 after turning on scan tool MB991502.
1. Connect SWS monitor kit MB991862 to the column switch connector.
2. Operate the MUT-II according to the procedure below to display "F.WIPER INT."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAGNOSIS"
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.