Code No.B1428: Side impact sensor (RH) communication error
Code No.B1429: Side impact sensor (RH) communication impossible
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If diagnosis code No. B1428 or B1429 is set in the SRS-ECU, always diagnose the CAN main bus line.
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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 side impact sensor (RH) and SRS-ECU is abnormal (No. B1428), or impossible (No. B1429).
PROBABLE CAUSES
- Malfunction of right side impact sensor
- Damaged wiring harness and connectors
- Malfunction of SRS-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics.
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Use 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 54C - Troubleshooting  ).
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STEP 2. Check whether the diagnosis code is set again.
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(1)Connect the negative battery terminal.
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(2)After erasing the diagnosis code memory, check the diagnosis code again.
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(3)Disconnect the negative battery terminal.
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Q.
Is diagnosis code No. B1428 or B1429 set?
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Go to Step 3.
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
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STEP 3. Right side impact sensor check.
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(1)Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
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(2)Alternate the side impact sensor (RH) and the side impact sensor (LH), and then install the alternated sensor.
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(3)Connect the negative battery terminal.
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(4)After erasing the diagnosis code memory, check the diagnosis code again.
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(5)Disconnect the negative battery terminal.
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Q.
Is diagnosis code No. B1428 or B1429 set?
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Go to Step 4.
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Replace the side impact sensor (RH) (Refer to ).
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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.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the connectors or harness wires.
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STEP 5. Check whether the diagnosis code is set again.
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Q.
Is diagnosis code B1428 or B1429 set?
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Replace the SRS-ECU (Refer to ).
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
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