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.

COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU operates this function in accordance with the input signals below.

  • Ignition switch (IG1)
  • Vehicle speed signal
If this function does not work normally, these input signal circuit(s) or the ETACS-ECU may be defective.

POSSIBLE CAUSES

  • Malfunction of the combination meter
  • Malfunction of the CAN bus lines
  • Malfunction of ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check the electric folding door mirrors operation.
Check that the door mirror is folded and unfolded with the remote controlled mirror switch when the ignition switch is at ACC position.

Q. Is the check result normal?
Go to Step 2.
Refer to inspection procedure 1 "Electric retractable remote controlled door mirrors does not work ."

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

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

Step 3. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal.

  • Ignition switch: ON
ECU TO BE CHECKED
  • ETACS ECU
OK: "OK" is displayed on the "ETACS ECU" menu.

Q. Is the check result normal?
Go to Step 4.
Refer to GROUP 54C - SWS, Inspection Procedure 2 "Communication with the ETACS ECU is not possible ."

Step 4. Check the combination meter.
Use the M.U.T.-III to diagnose the speedometer.

Q. Is the check result normal?
Go to Step 5.
Repair the combination meter (Refer to GROUP 54A - Combination meter, Troubleshooting ").

STEP 5. Retest the system.
Check that the vehicle speed-dependent unfolding function works normally.

Q. Is the check result normal?
End of diagnosis.
Replace the ETACS-ECU.