Inspection Procedure 3

INSPECTION PROCEDURE 3: The Immobilizer Indicator Light does not Illuminate.

Immobilizer Indicator Light Circuit (Part 1):

Immobilizer Indicator Light Circuit (Part 2):

CIRCUIT OPERATION
The immobilizer indicator starts flashing in approximately 10 seconds after the additional key registration mode is entered. It illuminates for 3 seconds after the additional key registration of the unregistered key is completed or after the registration completion judgment of the registered key. In addition, when a read error is detected, the immobilizer indicator stops flashing after read error judgment.

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

TROUBLESHOOTING HINTS
- Malfunction of combination meter
- Malfunction of ETACS-ECU
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set

STEP 1. Check ETACS-ECU connector C-218 for loose, corroded or damaged terminals, or terminals pushed back in the connector







Q: Is ETACS-ECU connector C-218 in good condition?

YES : Go to Step 2.

NO : Repair or replace the component(s). Confirm that scan tool MB991958 communicates normally.

STEP 2. Check the immobilizer indicator light circuit of ETACS-ECU connector C-218.







1. Disconnect the ETACS-ECU connector C-218 and measure at the harness side.
2. Turn the ignition switch to the "ON" position.







3. Connect terminal 60 to the ground.

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

YES : Replace the ETACS-ECU, and then record the VIN. Then, register the encrypted code again. Retest the system.

NO : Go to Step 3.

STEP 3. Check ETACS-ECU connector C-218 and combination meter connector C-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Are ETACS-ECU connector C-218 and combination meter connector C-04 in good condition?

YES : Go to Step 4.

NO : Repair or replace the component(s). Confirm that the immobilizer indicator light illuminates normally.

STEP 4. Check the wiring harness between combination meter connector C-04 (terminal 5) and ETACS-ECU connector C-218 (terminal 60).







Q: Is the wiring harness between combination meter connector C-04 (terminal 5) and ETACS-ECU connector C-218 (terminal 60) in good condition?

YES : Go to Step 5.

NO : Repair the wiring harness. Confirm the immobilizer indicator light illuminates normally.

STEP 5. Measure the voltage at combination meter connector C-04 in order to check the battery circuit of power supply system to the combination meter.

1. Turn the ignition switch to the "LOCK" (OFF) position.







2. Disconnect combination meter connector C-04, and measure at the wiring harness side.







3. Measure the voltage between terminal 10 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Is measured voltage approximately 12 volts?

YES : Go to Step 8.

NO : Go to Step 6.

STEP 6. Check combination meter connector C-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is combination meter connector C-04 in good condition?

YES : Go to Step 7.

NO : Repair or replace the component(s). Confirm the immobilizer indicator light illuminates normally.

STEP 7. Check the wiring harness between combination meter connector C-04 (terminal 10) and the battery.







NOTE: Also check intermediate connector C-24 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-24 is damaged, repair or replace it.

Q: Is the wiring harness between combination meter connector C-04 (terminal 10) and the battery 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.

NO : Replace the combination meter.