Code No. B1510 Left rear curtain air bag module (squib) system
(short circuit between squib circuit terminals) <Vehicles with
rear curtain air bag>
caution |
If diagnosis code No. B1510 is set in the
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 ignition signal is sent from
SRS-ECU to the rear curtain air bag module (squib) of impacted
side.
TROUBLE JUDGEMENT
The code is set when the short circuit
occurs between the terminals of SRS-ECU rear curtain air bag module
(squib) circuit.
PROBABLE CAUSES
- Damaged short spring *
- Short circuit between terminals of rear curtain air bag module
(squib) circuit
- Damaged connector(s)
- Malfunction of SRS-ECU
note |
*: The squib circuit connectors
integrate a short spring (which prevents the air bags from
being unintentionally deployed because of static electricity
by shorting the positive wire to the earth wire in the squib
circuit when the connectors are disconnected). Therefore,
when the above codes are set, the short spring may not be
released due to the damaged connector even when the
connectors are connected.
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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 set
again.
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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 diagnosis code No. B1510 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. Connector check: SRS-ECU, left rear curtain air
bag module 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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![](../../../img/52/AC905015AC00ENG.png)
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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. After disconnecting the SRS-ECU connector,
connect it again. (3)After disconnecting the right rear
curtain airbag module connector, connect the connector
again. (4)Connect the negative battery
terminal. (5)After erasing the diagnosis code memory,
check the diagnosis code again. (6)Disconnect the
negative battery terminal.
Q.
Is diagnosis code No. B1510 set?
Go to Step
4.
Replace
the connector concerned.
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STEP 4. 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 rear curtain airbag module
connector.
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![](../../../img/52/AC006042EB00ENG.png)
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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 rear curtain airbag module harness side
connector. (5)Connect the negative battery
terminal. (6)After erasing the diagnosis code memory,
check the diagnosis code again.
Q.
Is diagnosis code No. B1510 set?
Go to Step
5.
Replace
the left rear curtain air bag module.
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STEP 5. Resistance 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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![](../../../img/52/AC905015AC00ENG.png)
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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. After disconnect the SRS-ECU
connector. (3)
danger |
To release SRS-ECU wiring
harness side connector short spring in the
following operations, disconnect rear curtain
air bag module connector in advance, and keep
the squib circuit shorted.
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Disconnect the right rear curtain airbag module
connector.
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![](../../../img/52/AC905150BN00ENG.png)
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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 CL2+, CL2- line and the
short spring, and release the short spring. (5)Check the
continuity between the SRS-ECU wiring harness side connector
CL2+, CL2- line. OK: No
continuity
Q.
Is the check result normal?
Go to Step
6.
Repair
the wiring harness.
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STEP 6. Check whether the diagnosis code is set
again.
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Q.
Is diagnosis code No. B1510 set?
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Replace
SRS-ECU.
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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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