Code No.B1410
Passenger’s (front) air bag module (squib) system (short
circuit between squib circuit terminals)
caution |
- If
the diagnosis code B1410 is set to SRS-ECU, be sure
to diagnose the CAN bus line.
- Follow the diagnosis procedure below. If diagnosis
code B1410 is set, check squib
side circuit.
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OPERATION
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 in
SRS-ECU, the electric
current is supplied from SRS-ECU to the passenger’s (front) air
bag module (squib).
TROUBLE JUDGEMENT
The code is set when the short circuit
occurs to between the terminals of SRS-ECU passenger’s (front)
air bag module (squib) circuit.
PROBABLE CAUSES
- Damaged short spring *
- Short circuit between terminals of passenger’s (front) 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
reset.
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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. B1410 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: 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)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.
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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 the 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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(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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(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
passenger’s (front) air bag
module harness side connector ASQ+, ASQ-
line. (5)Connect the negative battery
terminal. (6)
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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After erasing the diagnosis code memory, check the
diagnosis code again. (7)Disconnect the negative battery
terminal.
Q.
Is the diagnosis code No. B1410 set?
Go to Step
5.
Replace
the passenger’s (front) air bag module (Refer to ).
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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)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 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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(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
reset.
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Q.
Is the diagnosis code No. B1410 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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