Inspection Procedure N-1

The ETACS-ECU does not receive any signal from the ignition switch (ACC).

Ignition Switch (ACC) Input Circuit:

CIRCUIT OPERATION
The ETACS-ECU operates the following equipment according to signal from the ignition switch (ACC):
- Windshield wiper and washer
- Rear wiper and washer

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the equipment, which is described in "CIRCUIT OPERATION", does network normally.

TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.
- The ETACS-ECU may be defective.

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe




STEP 1. Check ETACS-ECU connector C-226 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-226 in good condition?

YES: Go to Step 2.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. If the equipment, which are described in "CIRCUIT OPERATION", work normally, the input signal from the ignition switch (ACC) should be normal.

STEP 2. Check the ignition switch (ACC) circuit to the ETACS-ECU. Measure the voltage at ETACS-ECU connector C-226.




1. Disconnect ETACS-ECU connector C-226 and measure the voltage available at the junction block side of the connector.
2. Turn the ignition switch to the "ACC" position.




3. Measure the voltage between terminal 18 and ground.
- The voltage should equal approximately 12 volts (battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery positive voltage)?

YES: Replace the ETACS-ECU. If the equipment, which are described in "CIRCUIT OPERATION", work normally, the input signal from the ignition switch (ACC) should be normal.

NO: Go to Step 3.







STEP 3. Check the wiring harness between ETACS-ECU connector C-226 (terminal 18) and the ignition switch (ACC).

NOTE: Also check junction block connector C-211 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-211 is damaged, Repair or replace the damaged components) as described in Harness Connector Inspection.

Q: Is the wiring harness between ETACS-ECU connector C-226 (terminal 18) and ignition switch (ACC) in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. If the equipment, which are described in "CIRCUIT OPERATION", work normally, the input signal from the ignition switch (ACC) should be normal.