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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.
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The code is set when the input terminal of SRS-ECU side-airbag module (squib) is shorted
to power supply.
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- Damaged wiring harness and connectors
- side-airbag module (squib) harness shorted to power supply
- Malfunction of SRS-ECU
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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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Repair the CAN bus line (Refer to GROUP 54C -
Troubleshooting ).
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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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Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunction ).
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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 D-39 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 D-39 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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(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 C-124 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 D-39 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 terminals 56, 57 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 C-124 harness side connector.
- Voltage between terminal No. 56/57 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 between the C-124 SRS-ECU connector terminal No. 56/57
and the D-39 side-airbag module connector terminal No. 2/1.
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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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