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Inspection Procedure 7: The headlight automatic shutdown function does not work normally.
 
 
cautionBefore 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), electric motor 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 customization 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 off the power supply mode of the electric motor switch 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) Press the electric motor switch to turn on the power supply mode.
(3) Use the ETACS-ECU configuration function to check that the "Headlight auto cut customize" is set to "Enable (C-spec.)"
(4) Press the electric motor switch to turn off the power supply mode.
Is the check result normal?
Go to Step 2.
Use the ETACS-ECU customization function to set the "Headlight auto cut customize" to "Enable (C-spec.)" (Refer to ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), read the ETACS 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 service data to check the signals related to the operation of headlight automatic shutdown function.
  • Press the electric motor switch to turn off the power supply mode position.
  • Turn the lighting switch to the "TAIL" position.
 
Item No.Item nameNormal condition
Item 254IG voltage1 V or less
Item 340Head light switch (Tail)ON
  • Turn the lighting switch to the "HEAD" position.
 
Item No.Item nameNormal condition
Item 341Head light switchON
  • Open the driver's door.
 
Item No.Item nameNormal condition
Item 256Dr 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 OSS-ECU (IG1) signal is not received ."
: Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 10 "The column switch signal is not received ."
: Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 4 "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.