Inspection Procedure C-5: The driver’s door switch signal is not received. <LH drive vehicles>


caution Whenever the ECU is replaced, ensure that the input signal circuit is normal.












COMMENTS ON TROUBLE SYMPTOM
Input signal from the driver’s door switch is used to operate the functions below. If the signal is abnormal, these functions will not work normally.

  • Lamp reminder function
  • Key reminder function
  • Ignition key cylinder illumination lamp
  • Headlamp automatic-shutdown function
  • Room lamps

PROBABLE CAUSES

  • Malfunction of the door switch (front: LH)
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the installation condition.
Check that the door switch (front: LH) is installed on the body correctly.

Q. Is the check result normal?
Go to Step 2.
Correct the installation condition.

STEP 2. Connector check: E-17 door switch (front: LH) connector

Q. Is the check result normal?
Go to Step 3.
Repair the defective connector.

STEP 3. Check the door switch (front: LH).
Refer to GROUP 42 - Door Assembly .

Q. Is the check result normal?
Go to Step 4.
Replace the door switch (front: LH).

STEP 4. Connector check: D-419 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 5.
Repair the defective connector.

STEP 5. Check the wiring harness between E-17 door switch (front: LH) connector terminal No.1 and D-419 ETACS-ECU connector terminal No.10.
note Prior to the wiring harness inspection, check junction block connector D-409 and intermediate connector D-237, and repair if necessary.

  • Check the input line for open and short circuit.

Q. Is the check result normal?
Go to Step 6.
Repair the wiring harness.

STEP 6. Retest the system.
Check that the driver’s door switch signal is received normally.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
Replace the ETACS-ECU.