Code No.B1418:
Front impact sensor (LH) communication error
Code No.B1419: Front impact sensor (LH)
communication impossible
caution |
If diagnosis code 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 (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 (LH) 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 (LH) 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 reset.
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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 the 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 (LH).
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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 front impact sensor (LH) and the front impact sensor (RH), and then
install the alternated sensor.
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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 the diagnosis code No. B1418 or B1419 set?
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Replace the front impact sensor (LH) (Refer to ).
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Go to Step 4
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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 (LH) connector.
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note |
After inspecting intermediate connector inspect the wiring harness. If the intermediate
connector is damaged, repair or replace it.
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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 reset.
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Q.
Is the 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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