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DTC B1457: Side impact sensor (rear: LH) voltage error
 
 
cautionIf DTC B1457 is stored in the SRS-ECU, always diagnose the CAN main bus line.
 
 
CIRCUIT OPERATION
The side impact sensor transmits acceleration data to the SRS-ECU. The SRS-ECU then determines. if the curtain air bags should be inflated, and then sends an ignition signal. The side impact sensor also diagnoses itself, and sends a diagnostic trouble code to the SRS-ECU if a problem occurs.
 
 
DTC SET CONDITIONS
This diagnostic trouble code will stored when the power supply voltage to the side impact sensor (rear: LH) remains less than a predetermined value for one second.
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness or connectors
  • Malfunction of the side impact sensor (rear: LH)
  • Malfunction of the SRS-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the scan tool ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is stored.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is stored.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC stored?
Go to Step 3.
There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
 
STEP 3. Check of short to power supply, short to ground, and open circuit in CLH+, CLH- line in between SRS-ECU connector and side impact sensor (rear: LH) connector.
Is the check result normal?
Go to Step 4.
Repair the connectors or harness wires.
 
STEP 4. Check the side impact sensor (rear: LH).
(1) Disconnect the negative battery terminal.
(2) Alternate the side impact sensor (rear: LH) and the side impact sensor (rear: RH), and then install the alternated sensor.
(3) Connect the negative battery terminal.
(4) Erase the DTC from memory, and check the DTC.
Is DTC B1447 stored?
Replace the side impact sensor (rear: LH) with a new one (Refer to ).
Go to Step 5.
 
STEP 5. Check whether the DTC is stored again.
Check again if the DTC is stored.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is stored.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC B1457 stored?
Replace the SRS-ECU (Refer to ).
An intermittent malfunction is suspected (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).