Inspection Procedure M-1

Dome Light: Dome Light Does Not Illuminate

Dome Light Drive Circuit:

Connectors:

CIRCUIT OPERATION
The dome light dimming function and the keyless entry system answerback function illuminate the dome light when the dome light switch is at "door control operation position."

TECHNICAL DESCRIPTION (COMMENT)
If the dome light does not illuminate at all, the dome light bulb may be burned out, or the power supply circuit or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the dome light
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:
- MB991223: Test Harness Set

STEP 1. Check the trouble symptom.

Q: Does the dome light illuminate when the dome light switch is set to "ON" position?

YES: Go to Step 2.

NO: Go to Step 4.







STEP 2. Check the dome light connector D-03 or D-04 and ETACS-ECU connector C-114 for damage.

Q: Are dome light connector D-03 or D-04 and ETACS-ECU connector C-114 in good condition?

YES: Go to Step 3.

NO: Repair or replace them. Refer to Harness Connector Inspection. The dome light should illuminate.










STEP 3. Check the harness wires between dome Eight connector D-03 or D-04 and ETACS-ECU connector C-114.

NOTE: After checking intermediate connector C-103, check the wires. If intermediate connector C-103 is damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Are the harness wires between dome light connector D-03 or D-04 and ETACS-ECU connector D-114 in good condition?

YES: Replace the ETACS-ECU. The dome light should illuminate.

NO: Repair them. The dome light should illuminate.

STEP 4. Check the dome light bulb.

Q: Is the dome light bulb in good condition?

YES: Go to Step 5.

NO: Replace it. The dome light should illuminate.




STEP 5. Check the dome light power supply circuit at the dome light connector D-03 or D-04 .
1. Disconnect the dome light connector D-03 or D-04 and measure at the harness side.
2. Measure the voltage between terminal 2 and ground.

Q: Is the voltage approximately 12 volts (battery positive voltage)

YES: Replace the dome light. The dome light should illuminate.

NO: Go to Step 6.

STEP 6. Check dome light connector D-03 or D-04 for damage.

Q: Is dome light connector D-03 or D-04 in good condition?

YES: Go to Step 7.

NO: Repair or replace it. Refer to Harness Connector Inspection. The dome light should illuminate.

STEP 7. Check the harness wires between dome light connector D-03 or D-04 and battery.

NOTE: After checking intermediate connectors C-103 and C-109, junction block connectors C-78 and intermediate connector C-89, check the wires. If junction block connectors C-103 and C-109 and junction block connectors C-78 and intermediate connector C-89 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Are the harness wires between dome light connector D-03 or D-04 and battery in good condition?

YES: There is no action to be taken.

NO: Repair them. The dome light should illuminate.