Code No.B1428: Side impact sensor (RH) communication error
Code
No.B1429: Side impact sensor (RH) communication impossible
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caution |
If diagnosis code B1428 or B1429 is set in the
SRS-ECU, always diagnose the CAN main bus line.
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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
These diagnosis codes are set if
communication between the side impact sensor (front) (RH) and the SRS-ECU is
not possible or faulty.
PROBABLE CAUSES
- Damaged wiring harnesses or connectors
- Malfunction of the side impact sensor (front) (RH)
- Malfunction of the SRS-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use the 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 54D, Diagnosis ).
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STEP 2. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is
set.
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(1)Erase the diagnosis code.
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(2)Ignition: "LOCK" (OFF) position to "ON"
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(3)On completion, check that the diagnosis code is not
reset.
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Q.
Is the diagnosis code set?
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Go to Step 3.
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There
is an intermittent malfunction such as poor engaged connector(s) or open
circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
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STEP 3.Check the side impact sensor (RH).
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(1)Disconnect the negative battery terminal.
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(2)Replace the side impact sensor (front) (RH) with the side
impact sensor (front) (LH).
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(3)Connect the negative battery terminal.
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(4)Erase diagnosis code memory, and check the diagnosis
code.
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Q.
Is diagnosis code B1438 or B1439 set?
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Replace the side impact sensor
(front) (RH) with a new one (Refer to ). Then go to Step 4.
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Repair the harness wires between
SRS-ECU connector D-23 (terminal No.63 and 64) and side impact sensor
(front) (RH) connector E-28 (terminal No.1 and 2). Than go to Step 4
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STEP 4. Check whether the diagnosis code is reset.
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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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An
intermittent malfunction is suspected (Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
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