INSPECTION PROCEDURE 4: Vehicle speed-dependent unfolding function does not work normally.


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

OPERATION
The ETACS-ECU calculates the intermittent wiper interval according to the vehicle speed signal which is sent by the ABS-ECU <Vehicles without ASC> or ASC-ECU <Vehicles with ASC>.

  • Ignition switch (IG1)

COMMENTS ON TROUBLE SYMPTOM
If this function does not work normally, these input signal circuit(s) or the ETACS-ECU may be defective. Also, with a customisation function, the door mirrors may be set to a mode in which the vehicle speed-dependent unfolding function is not activated.

PROBABLE CAUSES

  • Faulty vehicle speed signal
  • The CAN bus line is defective.
  • Malfunction of ETACS-ECU
  • Damaged wiring harness and connectors

DIAGNOSTIC PROCEDURE

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.
Use the ETACS customisation function to set "AUTO FOLD MIRROR" to "VEHICLE SPEED DEPENDENT OPEN" (Refer to ).

STEP 2. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the CAN bus normal?
Go to Step 3.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting .)

STEP 3. M.U.T.-III other system diagnosis code
Check that the ABS-ECU<Vehicles without ASC> or ASC-ECU <Vehicles with ASC> sets a diagnosis code.

Q. Is the diagnosis code set?
Diagnose the ABS-ECU <Vehicles without ASC> (Refer to GROUP 35B - Diagnosis Code Chart ) or ASC-ECU <Vehicles with ASC> (Refer to GROUP 35C - Diagnosis Code Chart .
Go to Step 4.

STEP 4. Retest the system.
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 Malfunction .)
Replace ETACS-ECU.