Code No. B1619 Driver’s lap pre-tensioner (squib) system
(short circuit between squib circuit terminals) <Vehicles with
rear curtain air bag>
caution |
If diagnosis code B1619 is set in the
SRS-ECU, be sure to diagnose the CAN bus line.
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OPERATION
Only when the frontal collision impact that
exceeds 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 lap pre-tensioner
(squib).
TROUBLE JUDGEMENT
The code is set when the short circuit
occurs to between the terminals of SRS-ECU lap pre-tensioner (squib)
circuit.
PROBABLE CAUSES
- Damaged short spring *
- Short circuit between terminals of lap pre-tensioner (squib)
circuit
- Damaged connector(s)
- Malfunction of SRS-ECU
- Insufficient press of locking button or locking button not
pressed
note |
*: The squib circuit connectors
integrate a short spring (which prevents the lap
pre-tensioner 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. B1619 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, lap
pre-tensioner.
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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)After disconnecting the lap
pre-tensioner harness side connector, connect the connector
again. For the lap pre-tensioner harness side connector
disconnection, use the flat-tipped screwdriver to pull out
the harness side connector locking button. After releasing
the lock, disconnect the harness side
connector. (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. B1619 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 harness side connector.
After releasing the lock, disconnect the lap pre-tensioner
harness side connector.
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(3)Connect special tool dummy
resistor (MB991865) to special tool resistor harness
(MB991866). (4)Connect resistor harness to the lap
pre-tensioner 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 diagnosis code No. B1619 set?
Go to Step
5.
Replace
the seat belt with pre-tensioner.
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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. After disconnect the SRS-ECU connector.
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(3)
danger |
To release the SRS-ECU
connector short spring in the following
operations, disconnect this lap pre-tensioner
connector, and keep the squib circuit
shorted.
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Use the flat-tipped screwdriver to pull out the
locking button of harness side connector. After releasing
the lock, disconnect the lap pre-tensioner harness side
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 PD2+, PD2- line and the
short spring and release the short spring. (5)Take the
measurements below at the SRS-ECU harness side
connector.
- Continuity between PD2+, PD2- line
OK: No continuity
Q.
Is the check result normal?
Go to Step
6.
Repair
the wiring harness PD2+, PD2- line between the SRS-ECU
connector and the lap pre-tensioner connector.
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STEP 6. Check whether the diagnosis code is set
again.
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Q.
Is diagnosis code No. B1619 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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