Code No. B1499: Collision Decision
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If diagnosis code B1499 is set in the SRS-ECU, always diagnose the CAN main bus line.
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TROUBLE JUDGMENT
This diagnosis code is set after the air bag has deployed. If this diagnosis code is set before the air bag has deployed, the cause is probably a malfunction inside the SRS-ECU.
PROBABLE CAUSES
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 B1499 set?
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Replace the SRS-ECU (Refer to ).
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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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