Inspection Procedure H-1

Rear Wiper Motor Drive Circuit:

Connectors:

CIRCUIT OPERATION
A signal from the rear wiper switch is sent through the column-ECU inside the column switch to the ETACS-ECU. The signal turns on the relay inside the ETACS-ECU to operate
the rear wiper motor.

TECHNICAL DESCRIPTION (COMMENT)
The ETACS-ECU operates the rear wiper according to the input signals from the following switches:
- Ignition switch (ACC)
- Rear wiper switch
If the rear wiper does not work normally, the relevant input signal circuit, the rear wiper motor, the column switch (windshield wiper and washer switch) or the ETACS-ECU
may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the rear wiper motor
- Malfunction of the column switch (windshield wiper and windshield washer switch)
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS
Required Special Tools:
MB991223: Test Harness Set
MB991502: Scan Tool (MUT-II)
MB991529: Diagnostic Trouble Code Check Harness

STEP 1. Check the input signal.
Check the input signals from the following switches:
- Ignition switch (ACC)
- Rear wiper switch






CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

1. Connect scan tool MB991502 to the data link connector.
2. Check that the tone alarm of scan tool MB991502 sounds when the input signal enters.





1. Use special tool MB991529 to connect a voltmeter between ground terminal 4 or 5 and ETACS-ECU terminal 9 of the data link connector.
2. Check that the voltmeter indicator deflects once when the input signal enters.
If one of the input signal checks shows a defect, check the relevant input signal circuit.
If all of the input signal checks shows no defect, go to Step 2.




STEP 2. Check the rear wiper motor.
1. Disconnect the rear wiper motor connector F-07.
2. Connect a battery to the wiper motor as shown in the illustration and inspect the motor operation.
If the rear wiper motor is damaged, repair it. The rear wiper should work normally.
If the rear wiper motor is in good condition, go to Step 3.

STEP 3. Check the rear wiper motor installation state.

NOTE: The rear wiper motor is grounded to the liftgate through the installation bolts.

If the rear wiper motor installation state is not in good condition, repair it.
The rear wiper should work normally.
If it is in good condition, go to Step 4.







STEP 4. Check the rear wiper motor connector F-07 and ETACS-ECU connector C-114 for damage.
If the rear wiper motor connector F-07 and ETACS-ECU connector C-114 are damaged, repair or replace them. Refer to Harness Connector Inspection.
The rear wiper should work normally.
If the connectors are in good condition, go to Step 5.










STEP 5. Check the harness wires between rear wiper motor connector F-07 and ETACS-ECU connector C-114.

NOTE: After checking intermediate connector F-24 and junction block connector C-113, check the wires. If intermediate connector F-24 and junction block connector C-113 are damaged, repair or replace them. Refer to Harness Connector Inspection.

If the harness wires between rear wiper motor connector F-07 and ETACS-ECU connector are damaged, repair them.
The rear wiper should work normally.

If the harness wires are in good condition, replace the ETACS-ECU.
The rear wiper should work normally.