Code No. B1437:
Side impact sensor (LH) voltage error
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If diagnosis code No. B1437 is stored in the
SRS-ECU, always diagnose the CAN main bus line.
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OPERATION
The side impact sensor transmits acceleration data to the SRS-ECU. The SRS-ECU then determines.
if the side and/or curtain air bags should be inflated, and then sends an ignition signal. The
side impact sensor also diagnoses itself, and sends a diagnosis code to the SRS-ECU if a problem
occurs.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code will be stored when the power supply voltage to the side impact sensor
(LH) remains less than a predetermined value for one second.
PROBABLE CAUSES
- Damaged wiring harness or connectors
- Malfunction of the side 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 54C - Diagnosis).
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STEP 2. Check whether the diagnosis code is stored again.
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Check again if the diagnosis code is stored.
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(1)Erase the diagnosis code.
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(2)Ignition switch: "LOCK" (OFF) position to "ON"
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(3)On completion, check that the diagnosis code is not stored again.
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Q.
Is the diagnosis code stored?
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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 of short to power supply, short to earth, and open circuit
in SSL+, SSL- line in between SRS-ECU connector and side impact sensor (LH) 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 connectors or harness wires.
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STEP 4. Check the side impact sensor (LH).
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(1)Disconnect the negative battery terminal.
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(2)Alternate the side impact sensor (LH) and the side 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 the diagnosis code from memory, and check the diagnosis code.
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Q.
Is diagnosis code No. B1427 stored?
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Replace the side impact sensor (LH) 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 stored again.
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Q.
Is diagnosis code No. B1437 stored?
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Replace the SRS-ECU.
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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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