Inspection Procedure 4: When The ACC Distance Switch is Operated, The Distance from Vehicle Travelling in Front cannot be Changed.


COMMENTS ON TROUBLE SYMPTOM


The ACC/FCM-ECU detects an abnormality or there is an open circuit in the ACC distance switch system.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?
Go to Step 2
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).

STEP 2. Check the diagnosis code is reset.

Q. Is diagnosis code set?
Repair the adaptive cruise control system (ACC) (Refer to ).
Go to Step 3

STEP 3. Check the ETACS system data list.
Using M.U.T.-III, check the ETACS system data list (Refer to GROUP 54A - ETACS, Troubleshooting, data list reference table ).

  • Item No.406: ACC distance switch

Q. Is the check result normal?
Go to Step 8
Go to Step 4

STEP 4. Check the ACC distance switch.
Refer to .

Q. Is the check result normal?
Go to Step 5
Replace the cruise control switch (Refer to ).

STEP 5. Check the wiring harness between ETACS-ECU connector terminal and clock spring connector terminal ACC distance switch line.
Check the connector and power supply line for open circuit.

Q. Is the check result normal?
Go to Step 6
Repair the defective connector or the wiring harness.

STEP 6. Check the wiring harness between clock spring connector terminal and cruise control switch connector ACC distance switch terminal line.
Check the connector and power supply or earth line for open circuit.

Q. Is the check result normal?
Go to Step 7
Repair the defective connector or the wiring harness.

STEP 7. Check the clock spring.
Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring Inspection .

Q. Is the check result normal?
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ).
Replace the clock spring, and install the driver’s air bag module [Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring ].

STEP 8. M.U.T.-III data list.
Check the following data list (Refer to ).

  • Item No.51: ACC distance switch state

Q. Is the check result normal?
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the ACC/FCM-ECU (Refer to ).