Code No.B1457: Rear side impact sensor (LH) voltage error
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If diagnosis code B1457 is set 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 set when
the power supply voltage to the side impact sensor (rear) (LH) remains less
than a predetermined value for one second.
PROBABLE CAUSES
- Damaged wiring harness or connectors
- Malfunction of the side impact sensor (rear) (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 harness wires for open circuit or short circuit
between SRS-ECU connector D-25 (terminal No.15 and 16) and side impact
sensor (rear) (LH) connector E-40 (terminal No.2 and 1).
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Q.
Are the harness wires between SRS-ECU connector D-25 (terminal No.15 and
16) and side impact sensor (rear) (LH) connector E-40 (terminal No.2 and
1) in good condition?
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Go to Step 4.
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Replace the harness wires between
SRS-ECU connector D-25 (terminal No.15 and 16) and side impact sensor
(rear) (LH) connector E-40 (terminal No.2 and 1).
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STEP 4. Check the side impact sensor (rear) (LH).
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(1)Disconnect the negative battery terminal.
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(2)Replace the side impact sensor (rear) (LH) with the side
impact sensor (rear) (RH).
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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 B1457 set?
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Replace the SRS-ECU (Refer to ).
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Replace the side impact sensor (rear)
(LH) with a new one (Refer to ).
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