Inspection Procedures

Panic Alarm Does Not Work Normally.

TECHNICAL DESCRIPTION (COMMENT)
If keyless operation system [KOS] or keyless entry system [WCM] is normal, the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- Keyless operation system [KOS] or keyless entry system [WCM] may be defective
- The ETACS-ECU may be defective
- Function is not set with the customization.

DIAGNOSIS

Required Special Tools:
- MB991958 Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827 M.U.T.-III USB Cable
- MB991910 M.U.T.-III Main Harness A (Vehicles with CAN communication system)

STEP 1. Check if the theft-alarm is normally set and the exterior protection can be executed.

Check that the theft-alarm works normally.

Q: Does the theft-alarm work normally?

YES : Go to Step 2.

NO : Troubleshoot the theft-alarm. Symptom Chart

STEP 2. Using scan tool MB991958, read the diagnostic trouble code.

Check if DTC is set to the KOS-ECU [Vehicles with KOS] or WCM [Vehicles with WCM].

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. Refer to "How to connect the scan tool (M.U.T.-III)." How to Connect the Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Check whether the KOS or WCM related DTC is set
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES [vehicles with KOS] : Troubleshoot the KOS (Refer to KOS). Diagnostic Trouble Code Descriptions

YES [vehicles with WCM] : Troubleshoot the WCM (Refer to WCM). Diagnostic Trouble Code Descriptions

NO : Go to Step 3.

STEP 3. Check keyless operation system [KOS] or keyless entry system [WCM].

Check that the doors can be open by keyless operation key [KOS] or keyless entry transmitter [WCM].

Q: Do keyless operation system [KOS] or keyless entry system [WCM] work normally?

YES : Go to Step 4.

NO [vehicles with KOS] : Troubleshoot the KOS (Refer to KOS). Diagnostic Trouble Code Descriptions

NO [vehicles with WCM] : Troubleshoot the WCM (Refer to WCM). Diagnostic Trouble Code Descriptions

STEP 4. Using scan tool MB991958, check the customization function.

1. Turn the ignition switch to the "ON" position.
2. Use the ETACS-ECU customization function to check that the "Panic alarm switch" is set to "Enable".
3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the "Panic alarm switch" set to "Enable"?

YES : Replace the ETACS-ECU.

NO : Use the ETACS-ECU customization function to set the "Panic alarm switch" to "Enable". Programming and Relearning