Code No.B1427: Side impact sensor (RH) voltage error



caution If diagnosis code B1427 is set in the SRS-ECU, always diagnose the CAN main bus line.

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 (RH) remains less than a predetermined value for one second.

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 54C, 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 B1427 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 of short to power supply, short to earth, and open circuit in SSR-, SSR+ line in between SRS-ECU connector and side impact sensor (RH) connector.


Q. Is the check result normal?

Go to Step 4.
Repair the connectors or harness wires.

STEP 4. Check the side impact sensor (RH).


(1)Disconnect the negative battery terminal.
(2)Alternate the side impact sensor (RH) and the side impact sensor (LH), and then install the alternated sensor.
(3)Connect the negative battery terminal.
(4)Erase the diagnosis code from memory, and check the diagnosis code.

Q. Is diagnosis code B1427 set?

Replace the side impact sensor (RH) with a new one (Refer to ).
Go to Step 5.

STEP 5. Check whether the diagnosis code is reset.


Q. Is diagnosis code B1427 set?

Replace the SRS-ECU (Refer to ).
An intermittent malfunction is suspected (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).