Inspection Procedure E-1

Reciever And Transmitter Communication System:

CIRCUIT OPERATION
Receiver within the ETACS-ECU receives the lock/unlock signal from the transmitter.

TECHNICAL DESCRIPTION (COMMENT)
The cause may be a malfunction of the receiver and transmitter communication system.

TROUBLESHOOTING HINTS
- Malfunction of the ETACS-ECU
- Malfunction of the transmitter

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

STEP 1. Check the central door locking system operation.
If the central door locking system does not work normally, solve the problem first.
If the central door locking system works normally, go to Step 2.

STEP 2. Check the input signal.
Check the input signals from the transmitter switches.






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 a defect appears, check the transmitter input circuit. Refer to Inspection Procedure O-21.
If no defect appears, replace the ETACS-ECU.
All the doors should be locked or unlocked by using the transmitter.