Code No.B1458: Side-Impact sensor (Rear) (LH) (Squib) for Power Supply Circuit
Code No.B1459: Side-Impact sensor (Rear) (LH) (Squib) or Communication System




caution If diagnosis code B1448 or B1449 is set in the SRS-ECU, always diagnose the CAN main bus line.

OPERATION


The side impact sensor (Rear) includes an analogue G sensor and CPU, etc. The CPU monitors the analogue G sensor output signal. If the CPU judges that the curtain air bags should be deployed, it sends a fire signal to the SRS-ECU to deploy the curtain air bags. In addition, the CPU diagnoses the internal components of the side impact sensor (Rear). If a malfunction occurs, it requests the SRS-ECU to set a diagnosis code.

DIAGNOSIS CODE SET CONDITIONS


These diagnosis codes are set if communication between the side impact sensor (Rear) (LH) and the SRS-ECU is not possible or communication is faulty.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54F, Diagnosis ).

STEP 2. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Ignition: LOCK (OFF) position to ON
(3)On completion, check that the diagnosis code is not reset.

Q. Is the diagnosis code set?
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 the side impact sensor (Rear) (LH) (M.U.T.-III diagnosis code).
(1)Disconnect the negative battery terminal.
(2)Replace the side impact sensor (Rear) (LH) with the side impact sensor (Rear) (RH).
(3)Connect the negative battery terminal.
(4)Erase diagnosis code memory, and check the diagnosis code.

Q. Is diagnosis code B1448 or B1449 set?
Replace the side impact sensor (Rear) (LH) with a new one (Refer to ). Then go to Step 5.
Go to Step 4.

STEP 4. Check the harness wires for open circuit or short circuit between SRS-ECU connector C-120 (terminal No.15 and 16) and side impact sensor (Rear) (LH) connector D-12 (terminal No.1 and 2).


Q. Is the check result normal?

Go to Step 5.

Repair the harness wires between SRS-ECU connector C-120 (terminal No.15 and 16) and side impact sensor (Rear) (LH) connector D-12 (terminal No.1 and 2).

STEP 5. Check whether the diagnosis code is reset.

Q. Is diagnosis code B1458 or B1459 set?
Replace the SRS-ECU (Refer to ).
An intermittent malfunction is suspected (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points ).