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Inspection Procedure 1: The system is not activated when the automatic high beam switch is operated.
 
 
caution
  • Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
COMMENTS ON TROUBLE SYMPTOM
When the operation indicator light in the combination meter does not illuminate, the column switch (automatic high beam switch), the ETACS-ECU or the FCM/LDW/AHB-ECU may be defective.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the column switch
  • Malfunction of the ETACS-ECU
  • Defective FCM/LDW/AHB-ECU circuit system
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), read the other system DTC.
Check if the DTC is set in the ETACS-ECU.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Erase the DTC.
(3) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(4) Check if the DTC is set.
Is the DTC set?
Troubleshoot the ETACS-ECU (Refer to ).
Go to Step 2.
 
STEP 2. Check that the headlights operate.
Carry out the following check.
  • Check that the low-beam headlights work normally.
  • Check that the auto light function work normally.
  • When the passing switch is operated, is the headlight beams (high and low-beams) switched?
Is the check result normal?
Go to Step 3.
Troubleshoot the headlight (Refer to ).
 
STEP 3. Check the automatic high beam switch.
Follow the steps below to check whether the automatic high beam indicator (in the combination meter) illuminates.
(1) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(2) Turn on the low-beam headlights. (Set the lighting switch to "AUTO" or "HEAD" position.)
(3) Turn on the automatic high beam switch.
The automatic high beam indicator (in the combination meter) illuminates.
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 column switch (Refer to ). Then Go to Step 4.
 
STEP 4. Retest the system.
Check that the automatic high beam operates normally.
Is the check result normal?
This diagnosis is complete.
Replace the ETACS-ECU (Refer to ).