Code No.B1453: Curtain air bag squib (LH) (power supply side)
short-circuited
| caution |
If diagnosis code B1453 is set in the SRS-ECU, always
diagnose the CAN main bus line.
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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 curtain air bag module
will deploy.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if the
curtain air bag module (LH) (squib) wire(s) are short-circuited to the power
supply.
PROBABLE CAUSES
- Damaged wiring harnesses or connectors
- Short to the power supply in the curtain air bag module (LH) (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 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 curtain air bag module (LH).
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(1)Disconnect the negative battery terminal.
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(2)Disconnect curtain air bag module (LH)
connector E-08. Use a flat-tipped screwdriver to unlock the locking button
at the harness side connector by withdrawing it toward you in two stages,
and then disconnect the connector.
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(3)Connect special tool dummy resistor
(MB991865) to special tool resistor harness (MB991884).
(4)Connect
special tool (MB991884) to the E-08 harness side connector.
(5)Connect
the negative battery terminal.
(6)Erase the diagnosis code from memory,
and check the diagnosis code.
Q.
Is diagnosis code B1453 set?
Go to Step 4.
Replace the curtain air bag module
(LH) (Refer to ).
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STEP 4. Check the curtain air bag module circuit. Voltage measurement
at the SRS-ECU connector D-25.
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(1)Disconnect the negative battery terminal.
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(2)Disconnect SRS-ECU connector D-25.
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(3)Disconnect curtain air bag module (LH)
connector E-08. Use a flat-tipped screwdriver to unlock the locking button
at the harness side connector by withdrawing it toward you in two stages,
and then disconnect the connector.
(4)Connect the negative battery
terminal.
(5)Turn the ignition switch to the "ON" position.
(6)
| 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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Measure the voltage between D-25 harness side connector terminals
5, 6 and body earth.
OK: 0 V
Q.
Is the check result normal?
Go to Step 5.
Repair the harness wire between
SRS-ECU connector D-25 (terminal No.5 and 6) and curtain air bag module
(LH) connector E-08 (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 B1453 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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