Inspection Procedure L-4

Theft-alarm System: Panic alarm function does not work.

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

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

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB991502: Scan Tool (MUT-II)

STEP 1. Check the keyless entry system.

Q: Does the keyless entry system work normally?

YES: Go to Step 2.

NO: Refer to Inspection Procedure E-1 "None of the doors are locked/unlocked and the trunk lid opener is not operated by the keyless entry transmitter" or Inspection Procedure E-2 "None of the doors are locked and unlocked by the keyless entry transmitter."




STEP 2. Check the input signal by using the pulse check mode of the monitor.

Check the input signals from the transmitter "PANIC" switch:

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

1. Connect scan tool MB991502 to the data link connector.

2. Operate scan tool MB991502 according to the procedure below to display "PULSE CHECK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."

3. Check that scan tool MB991502 sounds.

Q: Does scan tool MB991502 sound when the transmitter "PANIC" switch is operated?

YES: Replace the ETACS-ECU. Verify that the panic alarm works normally.

NO: Refer to Inspection Procedure N-11 "ETACS-ECU does not receive any signal from lock, unlock, trunk or panic switch.