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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. B1421 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 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. B1421 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 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)caution |
Do not insert a test probe directly into the terminal
of right side-airbag module harness side connector from the connector front side as the connector
contact pressure may be weakened.
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Take the measurements below at the SRS-ECU and right side-airbag module harness side connectors.
- Continuity SRS+
line between SRS-ECU connector
and right side-airbag module connector
- Continuity SRS- line between SRS-ECU connector and right side-airbag module connector
OK: Continuity (less than 2 Ω)
Q.
Is the check result normal?
Go to Step 5.
Repair the wiring harness SRS+, SRS- line between the right side-airbag
module connector and the SRS-ECU connector.
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Q.
Is the diagnosis code No. B1421 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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