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Inspection Procedure 4: Vehicle speed-dependent unfolding 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.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in GROUP 54A, Immobilizer System - How to Register Key ID ).
 
 
CIRCUIT OPERATION
The ETACS-ECU extends the door mirror according to the vehicle speed signal which is sent by the ASC-ECU.
  • Ignition switch (IG1)
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
If this function does not work normally, input signal circuit(s) or the ETACS-ECU may be defective. Also, with a customization function, the door mirrors may be set to a mode in which the vehicle speed-dependent unfolding function is not activated.
 
 
 
TROUBLESHOOTING HINTS
  • Faulty vehicle speed signal
  • The CAN bus line is defective.
  • Malfunction of ETACS-ECU
  • Malfunction of ASC-ECU
  • Damaged wiring harness and connectors
 
 
 
 
DIAGNOSIS
STEP 1. Check the ETACS customization function.
Use the ETACS customization function to confirm that "Auto fold mirror" is set to "Open Vehicle SPD".
Is the check result normal?
Go to Step 2.
Use the ETACS customization function to set "Auto fold mirror" to "Open Vehicle SPD" (Refer to ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line.
Is the CAN bus line found to be normal?
Go to Step 3.
Repair the CAN bus line (Refer to GROUP 54C, CAN Bus Diagnostic Chart ).
 
STEP 3. Using scan tool (M.U.T.-IIISE), read the ETACS-ECU DTC.
Check if DTC is set in the ETACS-ECU.
Is the DTC set?
Troubleshoot the ETACS (Refer to GROUP 54A, ETACS - Diagnosis Trouble Code Chart ).
Go to Step 4.
 
STEP 4. Use the scan tool (M.U.T.-IIISE), read the other system DTC.
Check if DTC is set in the ASC-ECU.
Is the DTC set?
Troubleshoot the ASC system (Refer to GROUP 35C, Diagnostic Trouble Code Chart ).
Go to Step 5.
 
STEP 5. Retest the system.
Check that the vehicle speed-dependent unfolding function of the door mirrors 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 ETACS-ECU.