Inspection Procedure 2: None of the high-beam headlamps illuminate.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.









COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the headlamp relay (HI)
  • Malfunction of the column switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

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 dimmer switch.

  • Operate the dimmer switch.
Item No.
 Item name
 Normal condition
61
 Headlamp HI 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-04X headlamp relay (HI) connector

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

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

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

STEP 5. Voltage measurement at A-04X headlamp relay (HI) connector.
(1)Remove the headlamp relay (HI), and measure at the relay box side.
(2)Voltage between A-04X headlamp relay (HI) 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-04X headlamp relay (HI) 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-04X headlamp relay (HI) connector terminal No.2 to B-304 ETACS-ECU connector terminal No.19.
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 high-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 ).