Inspection Procedure 8: The rear door switch (LH) signal is not received.

  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)


If there is an error to the rear door switch (LH) input signal, the rear door switch (LH) signal is no longer output to the communication line.



STEP 1. Check the installation condition.

Check that the rear door switch (LH) is installed to the body correctly.

Q. Is the check result normal?

Go to Step 2.

Correct the installation condition.

STEP 2. Rear door switch (LH) check

Refer to GROUP 42A - Door .

Q. Is the check result normal?

Go to Step 3.

Replace the rear door switch (LH).

STEP 3. Check of short to power supply, short to earth, and open circuit in DLH line between ETACS-ECU connector and rear door switch (LH) connector

Q. Is the check result normal?

Go to Step 4.

Repair the connector(s) or wiring harness.

STEP 4. M.U.T.-III data list

Item No.
Item name
Normal condition
Item 259
RL door ajar switch
OK: Normal condition is displayed.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

Replace the ETACS-ECU.