INSPECTION PROCEDURE E-4: Keyless Entry System: Encrypted code cannot be registered.: 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 the trouble symptom.
Q: Is the encrypted code register mode set?

YES : Go to Step 4.

NO: Go to Step 2 < when using scan tool MB991502 > or Step 3 < when using a voltmeter >.
STEP 2. Check the input signal (by using scan tool MB991502).
Check the input signals from the following switches:
- Key reminder switch
- Hazard warning light 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. Check that the transmitter can be registered.

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 hazard warning light switch is turned from "OFF" to "ON": Refer to INSPECTION PROCEDURE O-4 "THE HAZARD WARNING LIGHT 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
- Hazard warning light 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. Check that the transmitter can be registered.

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 hazard warning light switch is turned from "OFF" to "ON": Refer to INSPECTION PROCEDURE O-4 "THE HAZARD WARNING LIGHT SWITCH SIGNAL IS NOT SENT TO THE ETACS-ECU ."
STEP 4. Check the transmitter.
Q: Can the encrypted code be registered after the transmitter battery has been renewed?

YES : No action is necessary and testing is complete.

NO: Replace the transmitter. If the transmitter can not be registered even if the transmitter has been replaced, replace the ETACS-ECU. Check that the transmitter can be registered.