Inspection Procedure 4: The vehicle speed-dependent unfolding function does not work normally.

caution Whenever the ECU is replaced, ensure that the input and output circuits are normal.


  • Electric motor switch (IG1)
  • Vehicle speed signal (combination meter)



  • Faulty vehicle speed signal
  • The CAN bus line is defective.
  • The ETACS-ECU may be defective
  • Damaged harness wires and connectors


STEP 1. Check the ETACS customisation function.

Use the ETACS customisation function to confirm that "Auto fold mirror" is set to "Vehicle speed dependent open".

Q. Is the check result normal?

Go to step 2.
Using the ETACS customisation function, set "Auto fold mirror" to "Vehicle speed dependent open". (Refer to .)

STEP 2. M.U.T.-III CAN bus diagnostics.

Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the CAN bus normal?

Go to step 3.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting -CAN Bus Diagnostics Table .)

STEP 3. M.U.T.-III diagnosis code.

Check if an ETACS-related diagnosis code is set.

Q. Is the diagnosis code set?

Diagnose the ETACS.(Refer to GROUP 54A - ETACS, Trouble Symptom Chart .)
Go to step 4.

STEP 4. M.U.T.-III diagnosis code for other systems

Check if a diagnosis code is set to the ASC-ECU.

Q. Is the diagnosis code set?

Carry out troubleshooting for the ASC-ECU.(Refer to GROUP 35C - Troubleshooting, Diagnosis Code Chart .)
Go to step 5.

STEP 5. Check the trouble symptom.

Check that the vehicle speed-dependent unfolding function of the door mirrors works normally.

Q. Is the check result normal?

Intermittent malfunction. Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions .)
Replace the ETACS-ECU.