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 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
These diagnosis codes are set if communication between the front impact sensor (LH) and the SRS-ECU is not possible or faulty.
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 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 54D, 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 the front impact sensor (LH).
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(1)Disconnect the negative battery terminal.
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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)Erase diagnosis code from memory, and check the diagnosis code.
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Q.
Is diagnosis code B1408 or B1409 set?
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Replace the front impact sensor (LH) with a new one (Refer to ). Go to Step 5.
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Go to Step 4.
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STEP 4. Check the harness wires for open circuit and short circuit between SRS-ECU connector D-24 (terminal No.38 and 39) and front impact sensor (LH) connector A-24 (terminal No.1 and 2).
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After inspecting intermediate connector D-241 inspect the wiring harness. If the intermediate connector D-241 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 harness wires between SRS-ECU connector D-24 (terminal No.38 and 39) and front impact sensor (LH) connector A-24 (terminal No.1 and 2).
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STEP 5. Check whether the diagnosis code is reset.
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Q.
Is diagnosis code B1418 or B1419 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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