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Inspection Procedure 5: The headlight automatic shutdown 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.
 
 
 
 
OPERATION
The ETACS-ECU operates this function in accordance with the input signals from column switch (lighting switch), ignition switch (IG1), and driver's door switch.
 
 
TECHNICAL DESCRIPTION (COMMENT)
If the headlight automatic shutdown function does not work normally, the above described input circuits or ETACS-ECU may have a problem. Also, it may be possible that the headlight automatic shutdown function is set to "Disable" through customization.
 
 
TROUBLESHOOTING HINTS
  • The driver's door switch may be defective
  • The ETACS-ECU may be defective
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check the customization function.
Use the ETACS-ECU customize function to check that the "Headlight auto cut customize" is set to "Enable (C-spec.)"
(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 "Headlight auto cut customize" is set to "Enable (C-spec.)"
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the check result normal?
Go to Step 2.
Use the ETACS-ECU customize function to set the "Headlight auto cut customize" to "Enable (C-spec.)".
 
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. Using scan tool (M.U.T.-IIISE), check data list.
Use the ETACS-ECU data list to check the signals related to the operation of headlight automatic shutdown function.
  • Turn the ignition switch to the "LOCK" (OFF) position.
  • Turn the lighting switch to the "TAIL" position.
 
Item No.Item nameNormal condition
79IG voltage1 V or less
14Headlight switch (Tail)ON
Item No.Item nameNormal condition
79IG voltage1 V or less
14Headlight switch (Tail)ON
  • Turn the lighting switch to the "HEAD" position.
 
Item No.Item nameNormal condition
15Headlight switchON
Item No.Item nameNormal condition
15Headlight switchON
  • Open the driver's door.
 
Item No.Item nameNormal condition
81Driver’s door ajar switchOpen
Item No.Item nameNormal condition
81Driver’s door ajar switchOpen
OK: Normal conditions are displayed for all the items.
Is the check result normal?
: Go to Step 4.
: Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 2 "The ignition switch (IG1) signal is not received" .
: Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 11 "The column switch signal is not received" .
: Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 5 "The front door switch (driver’s side) signal is not received" .
 
STEP 4. Retest the system.
Check that the headlight automatic shutdown function works 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.