INSPECTION PROCEDURE N-4: Theft-alarm system: Panic alarm function does not work.: Diagnosis

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools:

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

STEP 1. Verify the keyless entry system.
Q: Does the keyless entry system work normally?

YES : Go to Step 2 < when using scan tool MB991502 > or 3 < when using a voltmeter >.

NO: Solve the problem first. Refer to SYMPTOM CHART .
STEP 2. Check the input signal (by using scan tool MB991502).
Check the input signal 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. Check that the tone alarm of scan tool MB991502 sounds when the input signal enters.
Q: Does the tone alarm of scan tool MB991502 sound when the input signal enters?

YES : Replace the ETACS-ECU. The panic alarm should work normally.

NO: Scan tool MB991502 does not sound when the transmitter panic switch is depressed: Refer to INSPECTION PROCEDURE O-17 "THE LOCK, UNLOCK, TRUNK OR PANIC SWITCH SIGNAL IS NOT SENT TO THE ETACS-ECU ."

Fig 1: Connecting Scan Tool To Data Link Connector
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 3. Check the input signal (by using scan tool MB991502).
Check the input signals from the transmitter "PANIC" switch.
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 defects once when the input signal enters.
Q: Does the voltmeter indicator deflect?

YES : Replace the ETACS-ECU. The panic alarm should work normally.

NO: The voltmeter needle does not fluctuate when the transmitter panic switch is depressed: Refer to INSPECTION PROCEDURE O-17 "THE LOCK, UNLOCK, TRUNK OR PANIC SWITCH SIGNAL IS NOT SENT TO THE ETACS-ECU ."

Fig 2: Checking Input Signals From Transmitter "PANIC" Switch
Courtesy of DAIMLERCHRYSLER CORPORATION