DTC U1539: Theft-Alarm Siren LIN Checksum: Diagnosis

WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

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)

Using scan tool MB991958, read the ETACS-ECU diagnostic trouble code.

Check again if the DTC is set to the ETACS-ECU.

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.

Connect scan tool MB991958. Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) .
Erase the DTC.
Turn the ignition switch to the "ON" position.
Check if the DTC is set.
Turn the ignition switch to the "LOCK" (OFF) position.

Fig 1: Connecting Scan Tool To Data Link Connector

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the DTC set?

YES : Replace the theft-alarm siren.
NO : A poor connection, open circuit, or other intermittent malfunctions in the LIN bus lines between the theft alarm siren and the ETACS-ECU (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).