Inspection Procedure J-8

The High-beam Indicator Light does not Illuminate.

Hi-beam Indicator Light Circuit Part 1:

Hi-beam Indicator Light Circuit Part 2:

TECHNICAL DESCRIPTION (COMMENT)
If the high-beam indicator light does not illuminate, the high-beam indicator light bulb or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the high-beam indicator light bulb
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:
- MB991223: Test Harness Set

STEP 1. Check the headlight operation.

Q: Do the headlights illuminate?

YES: Go to Step 2.

NO: Repair the headlights first (Refer to INSPECTION PROCEDURE J-3).

STEP 2. Check at ETACS-ECU connector C-118 in order to check the high-beam indicator light circuit.




1. Disconnect ETACS-ECU connector C-118, and measure at the wiring harness side.
2. Turn the ignition switch to the "ON" position.




3. Connect terminal 72 to ground.

Q: Does the high-beam indicator light illuminate?

YES: Replace the ETACS-ECU. Check that the high-beam indicator light illuminates normally.

NO: Go to Step 3.




STEP 3. Check high-beam indicator light bulb.

Q: Is the high-beam indicator light bulb in good condition?

YES: Go to Step 4.

NO: Replace the high-beam indicator light bulb. Check that the high-beam indicator light illuminates normally.

STEP 4. Check the combination meter (printed-circuit board).

1. Remove the combination meter. Refer to Combination Meter Assembly and Vehicle Speed Sensor.
2. Remove the high-beam indicator light bulb. Then measure the resistance value between the bulb terminals.




3. Install the bulb to the combination meter, and then measure the resistance value between connector C-42 terminals 21 and 22. The measured resistance value should be roughly the same as the value measured in Step (2).

Q: Are these two resistance values extremely different?

YES: Repair or replace the combination meter (printed circuit board). Check that the headlight-beam indicator light illuminates normally.

NO (much the same): Go to Step 5.

STEP 5. Check combination meter connector C-42 in order to check the ignition switch (IG1) line of the power supply to the high-beam indicator light.




1. Disconnect combination meter connector C-42, and measure at the wiring harness side.




2. Measure the voltage between terminal 21 and ground.
- The measured value should be 12 volts (battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES: Go to Step 8.

NO: Go to Step 6.




STEP 6. Check combination meter connector C-42 for damage.

Q: Is combination meter connector C-42 in good condition?

YES: Go to Step 7.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the high-beam indicator light illuminates normally.










STEP 7. Check the wiring harness between combination meter connector C-42 (terminal 21) and the ignition switch (IG1).

NOTE: Also check junction block connectors C-108, C-113 and intermediate connector C-89. If junction block connectors C-108, C-113 or intermediate connectors C-89 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between combination meter connector C-42 (terminal 21) and the ignition switch (IG1) in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. Check that the high-beam indicator light illuminates normally.







STEP 8. Check combination meter connector C-42 and ETACS-ECU connector C-118 for damage.

Q: Are combination meter connector C-42 and ETACS-ECU connector C-118 in good condition?

YES: Go to Step 9.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the high-beam indicator light illuminates normally.







STEP 9. Check the wiring harness between combination meter connector C-42 (terminal 22) and ETACS-ECU connector C-118 (terminal 72).

Q: Is the wiring harness between combination meter connector C-42 (terminal 22) and ETACS-ECU connector C-118 (terminal 72) in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. Check that the high-beam indicator light illuminates normally.