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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
curtain air bag module (squib) of impacted side.
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The code is set when the open circuit occurs to the SRS-ECU curtain air bag module (squib)
circuit.
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- Open circuit to the curtain air bag module (squib) circuit
- Damaged connector(s)
- 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. B1441 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)Use the flat-tipped screwdriver to pull out the locking button of D-09 curtain air bag
module connector to the direction of the arrow. After releasing the lock, disconnect the connector.
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(3)Connect the dummy resistor (Special tool: MB991865) to the resistor harness (Special tool:
MB991884).
(4)Connect the resistor harness (special tool) to D-09 curtain air bag module 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. B1441 set?
 Go to Step 4.
Replace the right curtain air bag module.(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 C-124 SRS-ECU wiring harness side connector short spring
in the following operations, disconnect D-09 air bag module connector in advance, and keep the
squib circuit shorted.
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Use the flat-tipped screwdriver to pull out the locking button of D-09 curtain air bag
module connector to the direction of the arrow. After releasing the lock, disconnect the connector.
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(4)
| caution |
The short spring may not be released due to the insufficient insertion. Therefore, insert
the insulator for 4 mm or more.
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Insert an insulator (width: 3 mm, thickness: 0.5 mm) such as cable tie between the terminal
59/60 and the short spring, and release the short spring.
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(5)Connect the resistor harness (Special tool: MB991884) to the removed D-09 curtain air
bag module connector.
| note |
When the resistor harness is connected, the terminal No. of connected side and the terminals
Nos. 1 and 2 of resistor harness connector will become inverted.
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(6)Take the following measurements.
- Continuity between C-124 SRS-ECU wiring harness side
connector terminal No. 59 and the resistor harness connector terminal No. 2
- Continuity between C-124 SRS-ECU wiring harness side connector terminal No. 60 and
the resistor harness connector terminal No. 1
OK: Continuity (less than 2 Ω)
Q.
Is the check result normal?
Go to Step 5.
Repair the wiring harness between the C-124 harness side connector terminal No.
59/60.
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Q.
Is the diagnosis code No. B1441 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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