Panic Alarm

TECHNICAL DESCRIPTION
If the keyless entry system is normal, the ETACS-ECU is faulty.

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 is not operating normally, resolve the keyless entry system problems first. Refer to keyless Entry System - Diagnosis.

If the keyless entry system is normal, go to Step 2.

STEP 2. Check the input signal.
Inspect the input of the transmitter's "PANIC" switch.






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

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





1. Use special tool MB991529 to connect a voltmeter between grounded 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.
If a malfunction is found in the input inspection, inspect the transmitter input circuit. Refer to Keyless Entry System - Diagnosis.

If all operates are normal, replace the ETACS-ECU. Confirm that the panic alarm operates correctly.