Immobilizer Indicator Light Does Not Come ON with Ignition Switch ON and Engine Stop

Immobilizer Indicator Light Does Not Come ON with Ignition Switch ON and Engine Stop

Wiring Diagram

Refer to Immobilizer Control System Wiring Circuit Diagram Immobilizer Control System Wiring Circuit Diagram.

Circuit Description

When the ignition switch is turned ON, ECM transmits the indication ON signal to the combination meter to turn ON the immobilizer indicator light in case that there is not any problem with the immobilizer control system. Then, the combination meter turns ON the light. When the engine is started up, ECM transmits the indication OFF signal to the combination meter to turn OFF the light. Then, the combination meter turns OFF the immobilizer indicator light. However, in case that there is some trouble with the immobilizer control system, the immobilizer indicator light flashes ON and OFF when the ignition switch is turned ON.

Troubleshooting

1. Immobilizer indicator light power supply check

Turn ignition switch to ON position.

Do other warning lights come ON?
YES -
Go to Step 2.
NO -
Go to Step 3.

2. Diagnostic Trouble Code (DTC) check

Check if DTC U0073, U0101, U0121, U0140 and/or U0155 are detected by ECM referring to DTC Check DTC Check.

Is any of them detected?
YES -
Perform the troubleshooting referring to the corresponding flowchart in Section 1A.
NO -
Replace combination meter with a known-good one and recheck. If the immobilizer indicator light still remains OFF, replace ECM with a known-good one and recheck.

3. Fuse check

Turn ignition switch to OFF position.
Check if any related fuse is blown.

Is any fuse blown?
YES -
Replace blown fuse, and then check for short.
NO -
Go to Step 4.

4. Combination meter power supply wire circuit check

Remove combination meter referring to Service and Repair Combination Meter Removal and Installation.
Check for proper connection at "G28-1" and "G28-3" wire terminals of combination meter connector.
If OK, turn ignition switch to ON position and measure voltage between "G28-1" wire terminal of combination meter and vehicle body ground.

Is it 10 - 14 V?
YES -
Go to Step 5.
NO -
Repair open in power supply wire circuit.

5. Combination meter ground wire circuit check

Turn ignition switch OFF position.
Measure resistance between "G28-3" terminal of combination meter connector and vehicle body ground.

Is resistance 1 ohms or less?
YES -
Replace combination meter with a know-good one and recheck. If the immobilizer indicator light still remains OFF, replace ECM with a known-good one and recheck.
NO -
Repair open or high resistance in ground wire circuit.