Code No.C1705
LDW SW circuit low (short)
| caution |
- Before replacing
the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit
are normal.
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DIAGNOSTIC FUNCTION
When the FCM/LDW/AHB-ECU receives "ON" signal from the LDW switch for at least one minute consecutively,
diagnosis code No. C1705 will be set.
JUDGEMENT CRITERIA
The FCM/LDW/AHB-ECU receives a signal from the LDW switch via CAN communication with the ETACS-ECU.
When the ECU receives "ON" signal from the LDW switch for at least one minute consecutively,
it determines that the system is defective.
PROBABLE CAUSES
- Malfunction of the LDW switch (Stuck on)
- Malfunction of the FCM/LDW/AHB-ECU
- The ETACS-ECU may be defective
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III other system data list.
Check the ETACS-ECU data list.
- When the LDW switch is pressed.
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Item No.
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Item name
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Normal condition
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Item 405
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LDW switch
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ON
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- When the LDW switch is not pressed.
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Item No.
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Item name
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Normal condition
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Item 405
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LDW switch
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OFF
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OK: Normal condition is displayed.
Q.
Is the check result normal?
Go to Step 2.
NO 
: Go to Step 4.
STEP 2. M.U.T.-III data list.
Check the input signal.
- When the LDW switch is pressed.
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Item No.
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Item name
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Normal condition
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26
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LDW switch
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ON
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- When the LDW switch is not pressed.
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Item No.
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Item name
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Normal condition
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26
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LDW switch
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OFF
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|
OK: Normal condition is displayed.
Q.
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.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
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 LDW SW(S+) line
between ETACS-ECU connector and LDW switch connector.
Q.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
STEP 5. Check the LDW switch.
Check the LDW switch (Refer to ).
Q.
Is the check result normal?
Go to Step 6.
Replace the LDW switch (Refer to ).
STEP 6. M.U.T.-III other system data list.
Check the ETACS-ECU data list.
- When the LDW switch is pressed.
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Item No.
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Item name
|
Normal condition
|
Item 405
|
LDW switch
|
ON
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|
- When the LDW switch is not pressed.
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Item No.
|
Item name
|
Normal condition
|
Item 405
|
LDW switch
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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).
NO : Replace the FCM/LDW/AHB-ECU (Refer to ).