Inspection Procedure 1: The front fog lamps do not illuminate normally.



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












COMMENTS ON TROUBLE SYMPTOM


If none of the front fog lamps illuminate, the input signal circuit(s) below or the ETACS-ECU may be defective.

  • Tail lamp switch
  • Headlamp switch
  • Front fog lamp switch

PROBABLE CAUSES



  • Malfunction of the column switch
  • Malfunction of the front fog lamp relay
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Check that the tail/stop lamps and headlamps operate.


Check that the tail/stop lamps and headlamps illuminate normally.

Q. Is the check result normal?

Go to Step 2
Repair the tail/stop lamp(s) and headlamp(s). Refer to trouble symptom chart .

STEP 2. 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 3

STEP 3. M.U.T.-III data list


Check the input signals below, which are related to the front fog lamp.

  • Turn the electric motor switch to the "LOCK" (OFF) position.
  • Turn the tail lamp switch to the ON position.
  • Turn the front fog lamp switch to the ON position.
Item No.
Item name
Normal condition
30
IG SW (IG1) /Power SW(ON)
OFF
70
Front fog lamp
ON
OK: Normal conditions are displayed for all the items

Q. Are the check result normal?

YES <All the signals are received normally.> : Go to Step 4
NO <The electric motor switch (IG1) signal is not received.> : Refer to inspection procedure 2 "The electric motor switch (IG1) signal is not received ."
NO <The front fog lamp switch signal is not received.> : Refer to inspection procedure 9 "The column switch signal is not received ."

STEP 4. Connector check: A-07X front fog lamp relay connector


Q. Is the check result normal?

Go to Step 5
Repair the defective connector.

STEP 5. Check the front fog lamp relay.


Refer to .

Q. Is the check result normal?

Go to Step 6
Replace the front fog lamp relay.

STEP 6. Voltage measurement at the A-07X front fog lamp relay connector.


(1)Remove the front fog lamp relay, and measure at the relay box side.
(2)Check the voltage between the front fog lamp relay connector and body earth.

  • Voltage between A-07X front fog lamp relay connector terminal No.4 and body earth
  • Voltage between A-07X front fog lamp relay connector terminal No.3 and body earth
OK: System voltage

Q. Is the check result normal?

Go to Step 8
Go to Step 7

STEP 7. Check the wiring harness between A-07X front fog lamp relay connector terminals No.3, 4 and the fusible link (21).



  • Check the power supply line for open circuit and short circuit.

Q. Is the check result normal?

Go to Step 10
Repair the wiring harness.

STEP 8. Connector check: B-317 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 9
Repair the defective connector.

STEP 9. Check the wiring harness between A-07X front fog lamp relay connector terminal No.2 and B-317 ETACS-ECU connector terminal No.67.


note Prior to the wiring harness inspection, check intermediate connector B-27, and repair if necessary.

  • Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 10
Repair the wiring harness.

STEP 10. Retest the system


Check that the front fog lamps 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 ).