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DTC C1705: LDW SW circuit low (short)
 
 
caution
  • Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
TROUBLE JUDGMENT
When the FCM/LDW/AHB-ECU receives "ON" signal from the FCM and LDW ON/OFF switch for at least one minute consecutively, DTC No. C1705 will be set.
 
 
JUDGMENT CRITERIA
The FCM/LDW/AHB-ECU receives a signal from the FCM and LDW ON/OFF switch. When the ECU receives "ON" signal from the FCM and LDW ON/OFF switch for at least one minute consecutively, it determines that the system is defective.
 
 
TROUBLESHOOTING HINTS
  • The FCM and LDW ON/OFF switch (Stuck on) may be defective
  • The FCM/LDW/AHB-ECU may be defective
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
 
 
DIAGNOSIS
STEP 1. Check the FCM and LDW ON/OFF switch.
Check the FCM and LDW ON/OFF switch (Refer to ).
Is the check result normal?
Go to Step 2.
Replace the FCM and LDW ON/OFF switch (Refer to ).
 
STEP 2. Check FCM and LDW ON/OFF switch connector C-48, FCM/LDW/AHB-ECU connector E-18 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Is FCM and LDW ON/OFF switch connector C-48, FCM/LDW/AHB-ECU connector E-18 in good condition?
Go to Step 3
Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection .
 
STEP 3. Check the wiring harness between FCM and LDW ON/OFF switch connector C-48 (terminal 6) and FCM/LDW/AHB-ECU connector E-18 (terminal 4).
Check the input line for short and open circuit.
noteAlso check intermediate connector C-226 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-226 is damaged, repair or replace the connector as described in GROUP 00E, Harness Connector Inspection .
Is the check result normal?
Go to Step 4.
The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
 
STEP 4. Using scan tool (M.U.T.-III), check data list.
(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 Scan Tool (M.U.T.-III) ."
(2) Check the FCM/LDW/AHB-ECU data list (Refer to ).
  • When the FCM and LDW ON/OFF switch is pressed.
 
Item No.Item nameNormal condition
26LDW switchON
  • When the FCM and LDW ON/OFF switch is not pressed.
 
Item No.Item nameNormal condition
26LDW switchOFF
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 5.
Replace the FCM/LDW/AHB-ECU (Refer to ).
 
STEP 5. Check whether the DTC is set again.
Check again if the DTC is set in the FCM/LDW/AHB-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if DTC is set.
Is the DTC 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 ).