The ETACS-ECU will set diagnosis code No. U1540 when abnormal signals are received from
the security alarm sensor.
PROBABLE CAUSES
Faulty security alarm sensor
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 sensor.
A poor connection, open circuit, or other intermittent malfunctions in the LIN
bus lines between the security alarm sensor and the ETACS-ECU (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).