Code No. B1418: Front impact sensor (LH) communication error
Code No. B1419: Front impact sensor (LH) communication impossible
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If diagnosis code No. B1418 or B1419 is set in the SRS-ECU, always diagnose the CAN main bus line.
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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
The diagnosis code is set if the communication between the left front impact sensor and SRS-ECU is abnormal (No. B1418), or impossible (No. B1419).
PROBABLE CAUSES
- Damaged wiring harnesses or connectors
- Malfunction of the front impact sensor (LH)
- Malfunction of the SRS-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics.
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Use 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 - Troubleshooting ).
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STEP 2. Check whether the diagnosis code is set again.
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(1)Connect the negative battery terminal.
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(2)After erasing the diagnosis code memory, check the diagnosis code again.
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(3)Disconnect the negative battery terminal.
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Q.
Is diagnosis code No. B1418 or B1419 set?
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Go to Step 3.
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
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STEP 3. Check the front impact sensor.
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(1)Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
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(2)Alternate the right front impact sensor and left front impact sensor, and then install the alternated sensors.
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(3)Connect the negative battery terminal.
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(4)After erasing the diagnosis code memory, check the diagnosis code again.
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(5)Disconnect the negative battery terminal.
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Q.
Is diagnosis code No. B1418 or B1419 set?
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Go to Step 4.
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Replace the front impact sensor (LH) (Refer to ).
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STEP 4. 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(LH).
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the wiring harness.
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STEP 5. Check whether the diagnosis code is set again.
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Q.
Is diagnosis code No. B1418 or B1419 set?
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Replace SRS-ECU (Refer to ).
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
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