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Inspection Procedure N-1

Ignition Switch (ACC) Input Circuit:






CIRCUIT OPERATION
The ETACS-ECU operates various functions according to the input signal from the ignition switch (ACC).

TECHNICAL DESCRIPTION (COMMENT)
The ignition switch (ACC) input signal is used to operate the windshield wiper and washer. If the signal fails windshield wiper and washer will not work normally.

NOTE: The windshield wiper and washer works normally if a normal ignition switch (ACC) signal is sent from the ignition switch directly to the front-ECU.

TROUBLESHOOTING HINTS
- 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 ignition switch (ACC) circuit at the ETACS-ECU connector C-86.
1. Disconnect the ETACS-ECU connector C-86 and measure at the junction block side.
2. Turn the ignition switch to "ACC" position.
3. Voltage between terminal 7 and ground.
- Voltage should be approximately 12 volts (battery positive voltage).
If not approximately 12 volts, go to Step 2.
If approximately 12 volts, replace the ETACS-ECU. The ignition switch (ACC) input signal should be able to be checked and the windshield wiper and washer should work normally.




STEP 2. Check the ETACS-ECU connector C-86 for damage.
If the ETACS-ECU connector C-86 is damaged, repair or replace it. Refer to Harness Connector Inspection.

The ignition switch (ACC) input signal should be able to be checked and the windshield wiper and washer should work normally.

If the connector is in good condition, go to Step 3.







STEP 3. Check the harness wires between ETACS-ECU connector C-86 and ignition switch (ACC).

NOTE: After checking junction block connector C-73, check the wires. If junction block connector C-73 is damaged, repair or replace it. Refer to Harness Connector Inspection.

If the harness wires between ETACS-ECU connector C-86 and ignition switch (ACC) are damaged, repair them. The ignition switch (ACC) input signal should be able to be checked and the windshield wiper and washer should work normally.
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