Code No.U1539 Security alarm siren LIN checksum <Vehicles with security alarm sensor>




JUDGMENT CRITERIA


The ETACS-ECU will set diagnosis code No. U1539 when abnormal signals are received from the security alarm siren.

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


Check whether the diagnosis code is reset.


Check again if the diagnosis code is set to the ETACS-ECU.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?

Replace the security alarm siren.

A poor connection, open circuit, or other intermittent malfunctions in the LIN bus lines between the security alarm siren and the ETACS-ECU (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).