Inspection Procedure 4

The Immobilizer Indicator Light does not Illuminate.

Part 1:

Part 2:

CIRCUIT OPERATION
If the requirements for starting the engine are not satisfied, the immobilizer-ECU flashes the immobilizer indicator for 30 seconds.

TECHNICAL DESCRIPTION (COMMENT)
The immobilizer indicator light or a malfunction of the combination meter or immobilizer-ECU.

TROUBLESHOOTING HINTS
- Malfunction of combination meter
- Malfunction of immobilizer-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:
- MB991223: Harness




STEP 1. Check immobilizer-ECU connector C-22 for loose, corroded or damaged terminals, or terminals pushed back in the connector

Q: Is immobilizer-ECU connector C-124 in good condition?

YES: Go to Step 2.

NO : Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Confirm that scan tool MB991958 communicates normally.

STEP 2. Check at immobilizer-ECU connector C-22 in order to check the immobilizer indicator light circuit

1. Disconnect immobilizer-ECU C-22, and measure at the wiring harness side.
2. Turn the ignition switch to the "ON" position.

3. Connect terminal 9 to the ground.

Q: Does only the immobilizer indicator light illuminate? (other indicator lights are in good condition)

YES : Replace the immobilizer-ECU. Then register the password (secret code) and encrypted code.

NO : Go to Step 3.




STEP 3. Check combination meter connector C-02 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is combination meter connector C-02 in good condition?

YES : Go to Step 4.

NO : Repair or replace the damaged components). Refer to Harness Connector Inspection. Confirm that scan tool MB991958 communicates normally.




STEP 4. Check the wiring harness between combination meter connector C-02 (terminal 31) and immobilizer-ECU connector C-22 (terminal 9).

Q: Is the wiring harness between combination meter connector C-02 (terminal 31) and immobilizer-ECU connector C-22 (terminal 9) in good condition?

YES : Go to Step 5.

NO : Repair the wiring harness. Check to see that all meters operate.




STEP 5. Check combination meter connector C-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is combination meter connector C-01 in good condition?

YES : Go to Step 6.

NO : Repair or replace the damaged components). Refer to Harness Connector Inspection. Confirm that scan tool MB991958 communicates normally.

STEP 6. Check the ignition switch (IG1) circuit to the combination meter. Measure the voltage at combination meter connector C-01.




1. Disconnect combination meter connector C-01 and measure the voltage available at the wiring harness side of the connector.
2. Turn the ignition switch to the "ON" position.




3. Measure the voltage between terminal 9 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Is battery voltage (approximately 12 volts) present?

YES : Go to Step 8.

NO : Go to Step 7.







STEP 7. Check the wiring harness between combination meter connector C-01 (terminal 9) and the ignition switch (IG1).

NOTE: Also check junction block connector C-211 and C-214 and joint connector C-23 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-211 or C-214 or joint connector C-23 is damaged, Repair or replace the damaged components). Refer to Harness Connector Inspection.

Q: Is the wiring harness between combination meter connector C-01 (terminal 9) and the ignition switch (IG1) in good condition?

YES : Go to Step 8.

NO : Repair the wiring harness. Check to see that all meters operate.

STEP 8. Retest the system.

Q: Is the malfunction eliminated?

YES : The procedure is complete. (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to How to Use Troubleshooting/Inspection Service Point).

NO: Go to Step 1.