Inspection Procedure 1: None of the low-beam headlamps illuminate.











COMMENTS ON TROUBLE SYMPTOM


If none of the low-beam headlamps illuminate, the headlamp switch input circuit, the headlamp relay (LO) or the ETACS-ECU may be defective.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code.
When the electric motor switch is turned to the "LOCK" (OFF) position, check that the ETACS-ECU does not set the diagnosis code.

Q. Is the diagnosis code set?
Refer to diagnosis code chart .
Go to Step 2.

STEP 2. M.U.T.-III data list
Check the input signal from the headlamp (low-beam) switch.

  • Turn the headlamp (low-beam) switch to the ON position.
Item No.
 Item name
 Normal condition
60
 Headlamp output
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 3.
Refer to inspection procedure 9 "The column switch signal is not received ."

STEP 3. Connector check: A-05X headlamp relay (LO) connector

Q. Is the check result normal?
Go to Step 4.
Repair the defective connector.

STEP 4. Check the headlamp relay (LO).
Refer to .

Q. Is the check result normal?
Go to Step 5.
Replace the headlamp relay (LO).

STEP 5. Voltage measurement at A-05X headlamp relay (LO) connector.
(1)Remove the headlamp relay (LO), and measure at the relay box side.
(2)Voltage between A-05X headlamp relay (LO) connector terminal Nos.1, 3 and body earth
OK: System voltage

Q. Is the check result normal?
Go to Step 7.
Go to Step 6.

STEP 6. Check the wiring harness between A-05X headlamp relay (LO) connector terminal Nos.1, 3 and the fusible link (21).

  • Check the power supply line from the fusible link (21) for open circuit and short circuit.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the wiring harness.

STEP 7. Connector check: B-304 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 8.
Repair the defective connector.

STEP 8. Check the wiring harness from A-05X headlamp relay (LO) connector terminal No.2 to B-304 ETACS-ECU connector terminal No.17.
note Prior to the wiring harness inspection, check the junction block connector B-308 and repair if necessary.

  • Check the earth wires for open circuit.

Q. Is the check result normal?
Go to Step 9.
Repair the wiring harness.

STEP 9. Retest the system.
Check that the low-beam headlamps illuminate normally.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU and register the ID codes (Refer to ).




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