Inspection Procedure 12: Front Passenger’s Door Unlock Sensor does not Work. <LH Drive Vehicles>

caution

Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

PROBABLE CAUSES

Malfunction of the exterior transmitter antenna assembly (front passenger’s side)
Malfunction of the unlock switch (front door: RH)
Damaged wiring harness and connectors
Malfunction of the KOS-ECU

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Check whether a KOS-related diagnosis code is set.

Q. Is the diagnosis code set?

Refer to

Go to Step 2.

STEP 2. Connector check: C-104 KOS-ECU connector, E-06 unlock sensor (front door: RH) connector

Q. Is the check result normal?

Go to Step 3.

Repair the defective connector.

STEP 3. Check the wiring harness between the C-104 KOS-ECU connector terminal Nos. 25, 36 and the E-06 unlock sensor (front door: RH) connector terminal Nos. 4, 2, and between the E-06 unlock sensor (front door: RH) connector terminal No. 6 and the earth.

Check the signal and earth wires for open circuit.

note

Before the wiring harness inspection, inspect the intermediate connectors C-113and C-114, and repair them if necessary.

Q. Is the check result normal?

Go to Step 4.

Repair the wiring harness.

STEP 4. KOS communication test

Using M.U.T.-III, perform the antenna communication test to check that the exterior transmitter antenna (front passenger’s door) communicates normally (Refer to

Q. Is the check result normal?

Go to Step 5.

Perform troubleshooting for the diagnosis code No. B240B (Refer to

STEP 5. After the unlock sensor (front door: RH) is replaced, check trouble symptom.

Operate the unlock sensor (front door: RH) to check that the door can be unlocked.

Q. Is the check result normal?

The diagnosis is complete.

Replace KOS-ECU and register the ID codes (Refer to