Code No. C2224 FCM switch


OPERATION


When the clearance warning control unit recognises that the forward collision mitigation system (FCM) and Ultrasonic misacceleration Mitigation System ON/OFF switch is turned on for at least one minute, the ECU sets diagnosis code No. C2224.

TROUBLE JUDGEMENT


The condition below is satisfied:

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. 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 2.

Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).

STEP 2. M.U.T.-III data list.


Check the ASTC-ECU system data list (Refer to GROUP 35C - Data List Reference Table ).

Item No.
 Item name
 Normal condition
32
 FCM off switch
 When the switch is operated: ON
When the switch is not operated: OFF
OK: Normal condition is displayed.

Q. Is the check result normal?

Go to Step 6.

Go to Step 3.

STEP 3. Check of short to earth circuit in power supply line between the ASTC-ECU connector and forward collision mitigation system (FCM) and Ultrasonic misacceleration Mitigation System ON/OFF switch connector.


Q. Is the check result normal?

Go to Step 4.

Repair the connector(s) or wiring harness.

STEP 4. Check the forward collision mitigation system (FCM) and Ultrasonic misacceleration Mitigation System ON/OFF switch.


Refer to .

Q. Is the check result normal?

Go to Step 5.

Replace the forward collision mitigation system (FCM) and Ultrasonic misacceleration Mitigation System ON/OFF switch (Refer to ).

STEP 5. M.U.T.-III data list.


Check the ASTC-ECU system data list (Refer to GROUP 35C - Data List Reference Table ).

Item No.
 Item name
 Normal condition
32
 FCM off switch
 When the switch is operated: ON
When the switch is not operated: OFF
OK: Normal condition is displayed.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

Replace the ASTC-ECU (Refer to GROUP 35C - FCM-ECU ).

STEP 6. M.U.T.-III data list.


Check the input signal (Refer to ).

Item No.
 Item name
 Normal condition
18
 FCM OFF SW input signal (CAN)
 When the switch is operated: ON
When the switch is not operated: OFF
OK: Normal condition is displayed.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

Replace the clearance warning control unit (Refer to ).