Inspection Procedure N-4

TECHNICAL DESCRIPTION (COMMENT)
If the keyless entry system is normal, the ETACS-ECU is defective.

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 keyless entry system.
If the keyless entry system does not work normally, solve the problem first.
If the keyless entry system is normal, go to Step 2.

STEP 2. Check the input signal.
Check the input signals from the transmitter "PANIC" 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 a defect appears, check the transmitter input signal circuit. Refer to Inspection Procedure O-21.
If no defect appears, replace the ETACS-ECU. The panic alarm should work normally.