Code No.B1422: Side-airbag squib (RH) (earth side)
short-circuited
| caution |
If diagnosis code B1422 is set in the SRS-ECU, always
diagnose the CAN bus lines.
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OPERATION
- The SRS-ECU judges how severe a collision is by detecting signals from
the left and right side impact sensors. If the impact is over a
predetermined level, the SRS-ECU sends an ignition signal. At this time, if
the side-airbag safing G-sensor is on, the SRS side-airbag will
inflate.
- The ignition signal is input to the side-airbag module to inflate the
side-airbag.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if the
side-airbag module (RH) (squib) wire(s) are short-circuited to the
earth.
PROBABLE CAUSES
- Damaged wiring harnesses or connectors
- Short to earth in the side-airbag module (RH) (squib) harness
- 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 lines (Refer to GROUP 54D, Diagnosis-Can Bus Diagnostic Chart
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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-airbag module (RH).
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(1)Disconnect the negative battery terminal.
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(2)Disconnect the side-airbag module (RH) connector
E-127.
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(3)Connect special tool dummy resistor
(MB991865) to special tool resistor harness (MB991866).
(4)
| caution |
Do not insert a test probe into the terminal from
its front side directly, as the connector contact pressure may be
weakened.
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Insert special tool MB991866 into the E-127 harness side connector
by backprobing.
(5)Connect the negative battery terminal.
(6)Erase
the diagnosis code from memory, and check the diagnosis code.
Q.
Is diagnosis code B1422 set?
Go to Step 4.
Replace the seatback frame of the
front seat (RH) (Refer to GROUP 52A, Front Seat ).
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STEP 4. Check the side-airbag module (RH) circuit. Resistance
measurement at the SRS-ECU connector D-23.
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(1)Disconnect the negative battery terminal.
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(2)Disconnect SRS-ECU connector D-23.
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(3)Disconnect side-airbag module (RH) connector
E-127.
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(4)
| caution |
Do not insert a test probe into the terminal from
its front side directly, as the connector contact pressure may be
weakened.
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Check for continuity between D-23 harness side connector terminals
57, 58 and body earth.
OK: Open circuit
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Q.
Is the check result normal?
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Go to Step 5.
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Repair
the harness wires between SRS-ECU connector D-23 (terminal No.57 and 58)
and side-airbag module (RH) connector E-127 (terminal No.2 and 1).
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STEP 5. Check whether the diagnosis code is reset.
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Q.
Is diagnosis code B1422 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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