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DTC C1783: ACC Distance Switch Fixed On
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
 
 
OPERATION
The ACC-ECU receives the ACC distance switch signal from the ETACS-ECU via CAN communication.
 
 
DIAGNOSTIC TROUBLE CODE SET CONDITION
This diagnostic trouble code is set when the abnormality below is detected:
  • The ACC distance switch remains on for at least one minute.
 
 
PROBABLE CAUSES
  • Damaged harness wires and connectors
  • Malfunction of ACC distance switch
  • Malfunction of ETACS-ECU
  • Malfunction of the clock spring.
  • Malfunction of ACC-ECU

 
 
DIAGNOSIS
STEP 1. Diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line. (Refer to GROUP 54C - Explanation About The Scan Tool (M.U.T.-III) Can Bus Diagnostics )
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the check result normal?
Go to Step 2
Repair the CAN bus lines (Refer to GROUP 54C - Diagnosis, Can Bus Diagnostics Table ).
 
STEP 2. Check the ETACS system data list.
Using scan tool (M.U.T.-III), check the ETACS system data list (Refer to GROUP 54A - ETACS, Diagnosis, data list reference table ).
  • Item No.406: ACC distance switch
Is the check result normal?
Go to Step 6
Go to Step 3
 
STEP 3. Check the ACC distance switch.
Refer to .
Is the check result normal?
Go to Step 4
Replace the cruise control switch (Refer to ).
 
STEP 4. Check the wiring harness between ETACS-ECU connector terminal and clock spring connector terminal ACC distance switch line, between clock spring connector terminal and ACC distance switch connector terminal.
Check the connector and power supply line for short circuit.
Is the check result normal?
Go to Step 5
Repair the defective connector or the wiring harness.
 
STEP 5. Check the clock spring.
Refer to GROUP 52B - Driver’s Air Bag Module and Clock Spring Inspection .
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 6. Scan tool (M.U.T.-III) data list.
Check the following data list (Refer to ).
  • Item No.51: ACC distance switch state
Is the check result normal?
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the ACC-ECU (Refer to ).