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Inspection Procedure 9: The welcome light function does not work normally.
 
 
caution
  • Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
TECHNICAL DESCRIPTION (COMMENT)
When the welcome light function does not operate normally, the keyless entry system or the ETACS-ECU may have a problem. Or, the welcome light function may have been set to disabled using the customization function.
 
 
TROUBLESHOOTING HINTS
  • The keyless entry system may be defective
  • The ETACS-ECU may be defective
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check the customization function.
Use the ETACS-ECU customization function to check that any one of the followings other than "Disabled" is set for "Welcome light" with a customization function.
  • Small light
  • Head light
(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) Turn the ignition switch to the "ON" position.
(3) Use the ETACS-ECU configuration function to check that the "Welcome light" is set to "Disabled"
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the check result normal?
Go to Step 2.
Set "Welcome light" to any one other than "Disabled" with a customize function (Refer to ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), read the DTC.
Check if DTC is set in the ETACS-ECU.
Is the DTC set?
Troubleshoot the ETACS-ECU (Refer to ).
Go to Step 3.
 
STEP 3. Check the keyless entry system operation.
Check that the keyless entry system operation normally.
Is the check result normal?
Go to Step 4.
Troubleshoot the keyless entry system (Refer to GROUP 42A - Troubleshooting <Vehicles without KOS> or GROUP 42B - Troubleshooting <Vehicles with KOS>).
 
STEP 4. Check the taillights and headlights.
When the lighting switch is operated, check that the taillights and headlights illuminate/go off normally.
Is the check result normal?
Go to Step 5.
Troubleshoot the taillights and headlights (Refer to trouble symptom chart ).
 
STEP 5. Retest the system.
The welcome light should work normally.
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.