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DTC B1417: Front impact sensor (LH) voltage error
 
 
cautionIf diagnostic trouble code B1417 is stored in the SRS-ECU, always diagnose the CAN main bus line.
 
 
CIRCUIT OPERATION
The front impact sensor (LH) transmits acceleration data to the SRS-ECU. The SRS-ECU then determines whether to operate the front air bags, and then outputs an ignition signal when necessary. The front impact sensor also diagnoses itself, and sends a diagnostic trouble code to the SRS-ECU if a malfunction occurs.
 
 
DTC SET CONDITIONS
This DTC will be stored when the power supply voltage to the front impact sensor (LH) remains less than a predetermined value for one second.
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness or connectors
  • Malfunction of the front impact sensor (LH)
  • Malfunction of the SRS-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), 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 ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is stored.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is stored.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC stored?
Go to Step 3.
There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
 
STEP 3. Check of short to power supply, short to ground, and open circuit in FLH-, FLH+ line between SRS-ECU connector and front impact sensor (LH) connector.
Is the check result normal?
Go to Step 4.
Repair the wiring harness.
 
STEP 4. Check the front impact sensor (LH).
(1) Disconnect the negative battery terminal.
(2) Alternate the front impact sensor (LH) and the front impact sensor (RH), and then install the alternated sensor.
(3) Connect the negative battery terminal.
(4) Erase the diagnostic trouble code from memory, and check the diagnostic trouble code.
Is DTC B1417 stored?
Replace the front impact sensor (LH) with a new one (Refer to ).
Go to Step 5.
 
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is stored.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is stored.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC B1417 stored?
Replace the SRS-ECU (Refer to ).
An intermittent malfunction is suspected (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).