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.
  • 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 )


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 customise 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

DIAGNOSTIC PROCEDURE


STEP 1. Check the ETACS customise function.


Use the ETACS customise 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 customise 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 diagnosis code.


Check that the ETACS-ECU sets a diagnosis code.

Q. Is the diagnosis code set?

Diagnose the ETACS.(Refer to GROUP 54A - ETACS, Diagnosis Code Chart .)
Go to Step 4.

STEP 4. 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 5.

STEP 5. 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.