Code No. B1410:
Passenger’s (front) air bag module (squib) system (short
circuit between squib circuit
terminals)
caution |
- If diagnosis code No. B1410 is set in the SRS-ECU,
be sure to diagnose the CAN bus line.
- Follow the diagnosis procedure below. If diagnosis
code No. B1410 is set, check
squib side circuit.
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Only when the frontal impact
exceeding the threshold is simultaneously detected (turned
ON) by the front impact sensor as well as by the analogue
G-sensor and safing G-sensor in SRS-ECU,
the electric current is supplied from SRS-ECU to the
passenger’s (front) air bag module
(squib).
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The code is set when the short
circuit occurs to between the terminals of SRS-ECU
passenger’s
(front) air bag module (squib) circuit.
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- Damaged short spring *
- Short circuit between terminals of passenger’s
(front) air bag module (squib)
circuit
- Damaged connector(s)
- Malfunction of SRS-ECU
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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. B1410 set?
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Go to Step
3.
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Intermittent
malfunction.
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STEP 3. Connector check: passenger’s (front) air
bag module,
SRS-ECU.
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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)Disconnecting the SRS-ECU connector, connect it
again.
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![](../../../img/52/ACB04307AB00ENG.png)
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(3)Use the flat-tipped screwdriver
to pull out the locking button of wiring harness side
connector, and release the lock, 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. B1410 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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![](../../../img/52/ACB04307AB00ENG.png)
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(2)Use the flat-tipped screwdriver
to pull out the locking button of wiring harness side
connector, and release the lock.
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![](../../../img/52/AC306760BA00ENG.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
harness side connector ASQ+,
ASQ- line. (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 diagnosis code No. B1410 set?
Go to Step
5.
Replace
the passenger’s (front) 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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(2)Disconnect the SRS-ECU connector.
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![](../../../img/52/ACB04307AB00ENG.png)
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(3)
danger |
To release the connector short
spring in the following operations,
disconnect this harness side connector, and keep
the squib circuit shorted.
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Use the flat-tipped screwdriver to pull out the
locking button of wiring harness side
connector, and release the lock.
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![](../../../img/52/ACF04632AE00ENG.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 ASQ+,
ASQ- line, and then release the short spring. (5)Take the
measurements below at the harness side connector.
- Continuity between the ASQ+, ASQ-
line
OK: No continuity
Q.
Is the check result normal?
Go to Step
6.
Repair
the wiring harnesses ASQ+, ASQ- line between the
passenger’s
(front) air bag module connector and the SRS-ECU connector.
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STEP 6. Check whether the diagnosis code is set
again.
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Q.
Is diagnosis code No. B1410 set?
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Replace
SRS-ECU.
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Intermittent
malfunction.
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