Code No.B1428: Side impact sensor (RH) communication error
Code No.B1429: Side impact sensor (RH) communication impossible


caution If diagnosis code B1428 or B1429 is set in the SRS-ECU, always diagnose the CAN main bus line.

OPERATION


If an impact of set value or more is detected, the side impact sensor sends the coded acceleration data to SRS-ECU. Based on the acceleration data, SRS-ECU determines the necessity of side-airbag and curtain air bag deployment, and then turns ON the power supply circuit to the inflator.

TROUBLE JUDGEMENT


The diagnosis code is set if the communication between the right side impact sensor and SRS-ECU is abnormal (No. B1428), or impossible (No. B1429).

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use 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 - Troubleshooting ).

STEP 2. Check whether the diagnosis code is reset.
(1)Connect the negative battery terminal.
(2)After erasing the diagnosis code memory, check the diagnosis code again.
(3)Disconnect the negative battery terminal.

Q. Is the diagnosis code B1428 or B1429 set?
Go to Step 3
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

STEP 3. Right side impact sensor check.
(1)Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
(2)Alternate the right side impact sensor and left side impact sensor, and then install the alternated sensors.
(3)Connect the negative battery terminal.
(4)After erasing the diagnosis code memory, check the diagnosis code again.
(5)Disconnect the negative battery terminal.

Q. Is the diagnosis code No. B1428 or B1429 set?
Replace the right side impact sensor (Refer to ).
Go to Step 4

STEP 4. 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 5
Repair the connectors or harness wires.

STEP 5. Check whether the diagnosis code is reset.

Q. Is the diagnosis code B1428 or B1429 set?
Replace SRS-ECU (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).