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
Faulty security alarm siren
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 ).