INSPECTION PROCEDURE C-6: Central Door Locking System: Forgotten key prevention function does not operate.: 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. Check method of the input signal
Q: Which is to be used, the scan tool or a voltmeter to check the input signal?

Scan tool MB991502 : Go to Step 2.

Voltmeter : Go to Step 3.
STEP 2. Check the input signal (by using scan tool MB991502).
Check the input signals from the following switches:
- Key reminder switch
- Driver's and passenger's door switch
- Driver's and passenger's door lock actuator 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 forgotten key prevention function should work normally.

NO :
- Scan tool MB991502 does not sound when the ignition key is removed from the ignition key cylinder: Refer to INSPECTION PROCEDURE O-3 "THE KEY REMINDER SWITCH SIGNAL IS NOT SENT TO THE ETACS-ECU ."
  
  Fig 1: Connecting Scan Tool MB991502 To Data Link Connector
  Courtesy of DAIMLERCHRYSLER CORPORATION
- Scan tool MB991502 does not sound when the driver's or passenger's door is opened: Refer to INSPECTION PROCEDURE O-8 "THE DRIVER'S OR PASSENGER'S DOOR SWITCH SIGNAL IS NOT SENT TO THE ETACS-ECU ."
- Scan tool MB991502 does not sound when the driver's inside lock knob is locked or unlocked: Refer to INSPECTION PROCEDURE O-10 "THE DRIVER'S OR PASSENGER'S DOOR LOCK ACTUATOR SWITCH SIGNAL IS NOT SENT TO THE ETACS-ECU ."
STEP 3. Check the input signal (by using a voltmeter).
Check the input signals from the following switches:
- Key reminder switch
- Driver's and passenger's door switch
- Driver's and passenger's door lock actuator 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 deflects once when the input signal enters.
Q: Does the voltmeter indicator deflect?

YES : Replace the ETACS-ECU. The forgotten key prevention function should work normally.

NO :
- The voltmeter needle does not fluctuate when the ignition key is removed from the ignition key cylinder: Refer to INSPECTION PROCEDURE O-3 "THE KEY REMINDER SWITCH SIGNAL IS NOT SENT TO THE ETACS-ECU ."
  
  Fig 2: Connecting Voltmeter Between Ground Terminal 4 And 5
  Courtesy of DAIMLERCHRYSLER CORPORATION
- The voltmeter needle does not fluctuate when the driver's or passenger's door is opened: Refer to INSPECTION PROCEDURE O-8 "THE DRIVER'S OR PASSENGER'S DOOR SWITCH SIGNAL IS NOT SENT TO THE ETACS-ECU ."
- The voltmeter needle does not fluctuate when the driver's inside lock knob is locked or unlocked: Refer to INSPECTION PROCEDURE O-10 "THE DRIVER'S OR PASSENGER'S DOOR LOCK ACTUATOR SWITCH SIGNAL IS NOT SENT TO THE ETACS-ECU ."