Code No.B1417:
Front impact sensor (LH) voltage error
caution |
If diagnosis code B1417 is set in the SRS-ECU, always
diagnose the CAN main bus line.
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note |
This front impact sensor (LH) indicates that the front impact sensor integrated in the
centre of the vehicle is defective.
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OPERATION
The front impact sensor 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 diagnosis code to the SRS-ECU if a malfunction occurs.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code will set when the power supply voltage to the front impact sensor
remains less than a predetermined value for one second.
PROBABLE CAUSES
- Damaged wiring harness or connectors
- Malfunction of the front impact sensor
- Malfunction of the SRS-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Go to Step 2.
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Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
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STEP 2. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition: "LOCK" (OFF) position to "ON"
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(3)On completion, check that the diagnosis code is not reset.
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Q.
Is the diagnosis code set?
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Go to Step 3.
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There is an intermittent malfunction such as poor engaged connector(s) or open
circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
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STEP 3. Check of short to power supply, short to earth, and open circuit
in FLH-, FLH+ line between SRS-ECU connector and front impact sensor connector.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the wiring harness.
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STEP 4. Check the front impact sensor.
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(1)Disconnect the negative battery terminal.
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(2)Alternate the front impact sensor, and then install the alternated sensor.
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(3)Connect the negative battery terminal.
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(4)Erase the diagnosis code from memory, and check the diagnosis code.
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Q.
Is diagnosis code B1417 set?
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Replace the front impact sensor with a new one (Refer to ).
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Go to Step 5.
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STEP 5. Check whether the diagnosis code is reset.
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Q.
Is diagnosis code B1417 set?
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Replace the SRS-ECU (Refer to ).
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An intermittent malfunction is suspected (Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
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