Code No.U1540
Security alarm SNSR.LIN checksum <Vehicles with security alarm sensor>
JUDGMENT CRITERIA
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.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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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 ).