[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
54 -CHASSIS ELECTRICAL > 54A-CHASSIS ELECTRICAL > FCM/LDW/AHB-ECU > DIAGNOSIS CODE PROCEDURES > CODE NO. C1784 FCM SWITCH FIXED ON
Code No. C1784 FCM switch fixed ON
 
 
caution
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
 
 
OPERATION
The FCM/LDW/AHB-ECU receives the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch signal from the ASC-ECU via CAN communication.
 
 
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality below is detected:
  • The forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch remains on for at least one minute.
 
 
PROBABLE CAUSES
  • Malfunction of the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch (Stuck on)
  • Malfunction of the ASC-ECU
  • Malfunction of the FCM/LDW/AHB-ECU
  • Damaged harness wires and connectors
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE other system data list.
Check the ASC-ECU data list (Refer to GROUP 35C - Troubleshooting ).
  • When the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch is pressed.
 
Item No.Item nameNormal condition
66FCM ON/OFF switchON
  • When the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch is not pressed.
 
Item No.Item nameNormal condition
66FCM ON/OFF switchOFF
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 2.
Go to Step 4.
 
STEP 2. M.U.T.-IIISE data list.
Check the input signal (Refer to ).
  • When the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch is pressed.
 
Item No.Item nameNormal condition
25FCM ON/OFF switchON
  • When the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch is not pressed.
 
Item No.Item nameNormal condition
25FCM ON/OFF switchOFF
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 3.
Replace the FCM/LDW/AHB-ECU (Refer to ).
 
STEP 3. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the FCM/LDW/AHB-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if diagnosis code is set.
Is the diagnosis code set?
Replace the FCM/LDW/AHB-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 4. Check of short to earth circuit in FCSW line between ASC-ECU connector and forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. Check the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch.
Refer to .
Is the check result normal?
Go to Step 6.
Replace the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch (Refer to ).
 
STEP 6. M.U.T.-IIISE other system data list.
Check the ASC-ECU data list (Refer to GROUP 35C - Troubleshooting ).
  • When the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch is pressed.
 
Item No.Item nameNormal condition
66FCM ON/OFF switchON
  • When the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch is not pressed.
 
Item No.Item nameNormal condition
66FCM ON/OFF switchOFF
OK: Normal condition is displayed.
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 ASC-ECU (Refer to GROUP 35C - ASC-ECU ).