Code No.B1423
Right side-airbag module (squib) system (shorted to squib circuit power
supply)
caution |
If the diagnosis code B1423
is set to SRS-ECU, be sure to diagnose the CAN bus line.
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OPERATION
In case of side collision, when the impact exceeding the
threshold is applied to the vehicle,
and when the impact is simultaneously detected (turned ON) by the side impact
sensor as well
as by the analogue G-sensor in SRS-ECU, the electric current is supplied from
SRS-ECU to the
side-airbag module (squib) of impacted side.
TROUBLE JUDGEMENT
The code is set when the input terminal of
SRS-ECU side-airbag module (squib) is shorted
to power supply.
PROBABLE CAUSES
- Damaged wiring harness and connectors
- side-airbag module (squib) harness shorted to power supply
- 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 reset.
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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 the diagnosis code No. B1423 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. Diagnosis check by dummy resistor connection.
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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)Disconnect the right side-airbag module
connector, unlock the connector by sliding the
locking button to the direction of the arrow as shown in the figure, and
then disconnect the connector.
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(3)Connect special tool dummy resistor
(MB991865) to special tool resistor harness (MB991866). (4)
caution |
Do not insert a probe directly into the terminal
from the connector
front side as the connector contact pressure may be weakened.
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Insert the resistor harness probe from the back of right
side-airbag module harness side
connector. (5)Connect the negative battery terminal. (6)After erasing
the diagnosis code memory, check the diagnosis code again. (7)Disconnect
the negative battery terminal.
Q.
Is the diagnosis code No. B1423 set?
Go to Step 4.
Replace the front seatback pad and
frame assembly (Refer to ).
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STEP 4. Voltage measurement at the SRS-ECU connector.
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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)While pushing the part "A" indicated in the
figure of the harness side connector, turn
the lock lever to the direction of the arrow to release the lock lever, and
disconnect the SRS-ECU
connector.
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(3)
danger |
To release the connector short spring in the
following operations,
disconnect this side-airbag module connector, and keep the squib circuit
shorted.
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Disconnect the right side-airbag module connector, unlock the
connector by sliding the
locking button to the direction of the arrow as shown in the figure, and
then disconnect the connector.
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(4)
caution |
The short spring may not be released due to the
insufficient insertion, thus insert for
4 mm or more.
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Insert a cable tie (width: 3 mm, thickness: 0.5 mm) between the
SRS+, SRS- line
and the short spring, and then release the short spring. (5)Connect the
negative battery terminal. (6)Ignition switch: ON (7)Take the
measurements below at the SRS-ECU harness side
connector.
- Voltage between SRS+, SRS- line and body earth
OK: 1 V or less (8)Disconnect the negative battery
terminal.
Q.
Is the check result normal?
Go to Step 5.
Repair the wiring harness SRS+,
SRS- line between the SRS-ECU connector
and the right side-airbag module connector.
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STEP 5. Check whether the diagnosis code is reset.
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Q.
Is the diagnosis code No. B1423 set?
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Replace 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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