Inspection procedure: 4 Check the power supply and earth circuit to the immobilizer ECU.


CIRCUIT OPERATION
Refer to .

COMMENTS ON TROUBLE SYMPTOM
The power supply and earth circuit to the immobilizer ECU may be defective.

POSSIBLE CAUSES

  • Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Connector check: Key reminder switch connector C-308


Q. Is the check result normal?

Go to Step 2.

Repair the defective connector.

Step 2. Voltage measurement at key reminder switch connector C-308 in order to check the battery circuit of power supply system to the key reminder switch.


(1)Disconnect the key reminder switch connector C-308 and measure the voltage at key reminder switch connector C-308 harness side.
(2)Turn the ignition switch to “ON” position.

(3)Measure the voltage between terminal 5 and earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 5.

Go to Step 3.

Step 3. Connector check: Engine control relay connector B-15X

Q. Is the check result normal?

Go to Step 4.

Repair the defective connector.

Step 4. Check the wiring harness between engine control relay connector B-15X (terminal 1) and key reminder switch connector C-308 (terminal 5).





note Prior to the wiring harness inspection, check joint connector C-116, intermediate connector C-18, and repair if necessary.

  • Check the power supply line for open circuit.

Q. Are the wiring harness between engine control relay connector B-15X (terminal 1) and key reminder switch connector C-308 (terminal 5) in good condition?

Go to Step 5.

Repair the wiring harness.

Step 5. Resistance measurement at key reminder switch connector C-308 to check the earth circuit to the key reminder switch connector.


(1)Disconnect the key reminder switch connector C-308 and measure the resistance at key reminder switch connector C-308 harness side.

(2)Measure the resistance between terminal 3 and earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

The procedure is complete.

Go to Step 6.

Step 6. Check the wiring harness between key reminder switch connector C-308 (terminal 3) and earth.



note Prior to the wiring harness inspection, check joint connector C-01 <RH drive vehicles>, and repair if necessary.

  • Check the earth wires for open circuit.

Q. Are the wiring harness between key reminder switch connector C-308 (terminal 3) and earth in good condition?

The procedure is complete.

Repair the wiring harness.