Inspection Procedure N-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
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicles communication interface
- MB991827: MUT-III USB cable
- MB991911: MUT-III Main harness B

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 "Keyless entry system does not operate."

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 MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.




1. Connect scan tool MB991958 to the data link connector.
2. Operate scan tool MB991958 according to the procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."

3. Check that scan tool MB991958 sounds.

Q: Does scan tool MB991958 sound when the transmitter "PANIC" switch is operated?

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

NO: Refer to Inspection Procedure P-13 "The ETACS-ECU does not receive signal from lock, unlock, trunk or panic switch.