- Center airbag sensor assembly detects line short circuit signal in front pretensioner squib LH circuit 5 times during primary check.
- Front pretensioner squib LH malfunction
- Center airbag sensor assembly malfunction
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VJQT |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - ] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1905/74-B1908/74; Short in Front Pretensioner Squib LH Circuit; 2016 - 2020 MY Sienna [12/2015 - ] | ||
|
DTC |
B1905/74 |
Short in Front Pretensioner Squib LH Circuit |
|
DTC |
B1906/74 |
Open in Front Pretensioner Squib LH Circuit |
|
DTC |
B1907/74 |
Short to GND in Front Pretensioner Squib LH Circuit |
|
DTC |
B1908/74 |
Short to B+ in Front Pretensioner Squib LH Circuit |
DESCRIPTION
The front pretensioner squib LH circuit consists of the center airbag sensor assembly and the front seat outer belt assembly LH.
This circuit signals the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the front pretensioner squib LH circuit.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1905/74 |
When one of following conditions is met: |
|
|
B1906/74 |
When one of following conditions is met:
|
|
|
B1907/74 |
When one of following conditions is met:
|
|
|
B1908/74 |
When one of following conditions is met:
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
-
Perform the simulation method by selecting Check Mode (signal check) with the Techstream (See page
![2016 - 2020 MY Sienna [12/2015 - ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: CHECK MODE PROCEDURE](/t3Portal/stylegraphics/info.gif)
).
-
After selecting Check Mode (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city street or rough road (See page
).
PROCEDURE
|
1. |
CHECK CONNECTOR |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Check that the connector is properly connected to the front seat outer belt assembly LH.
OK:
The connector is properly connected.
HINT:
If the connector is not connected securely, reconnect the connector and proceed to the next inspection.
(d) Disconnect the connector from the front seat outer belt assembly LH.
(e) Check that the floor wire connector (on the front seat outer belt assembly LH side) is not damaged.
OK:
The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
| NG |
|
REPLACE FLOOR WIRE |
|
|
2. |
CHECK FRONT SEAT OUTER BELT ASSEMBLY LH (FRONT PRETENSIONER SQUIB LH) |
SST: 09843-18061
(a) Disconnect the connectors from the front seat outer belt assembly LH.
(b) Connect SST (resistance 2.1 Ω) to connector C.
CAUTION:
Never connect a tester to the front seat outer belt assembly LH for measurement, as this may lead to a serious injury due to airbag deployment.
NOTICE:
- Do not forcibly insert SST into the terminals of the connector when connecting.
- Insert SST straight into the terminals of the connector.
(c) Connect the cable to the negative battery terminal, and wait for at least 2 seconds.
(d) Turn the ignition switch to ON, and wait for at least 60 seconds.
(e) Clear the DTCs stored in the memory (See page
).
(f) Turn the ignition switch off.
(g) Turn the ignition switch to ON, and wait for at least 60 seconds.
(h) Check the DTCs (See page
).
OK:
DTC B1905/74, B1906/74, B1907/74 or B1908/74 is not output.
Text in Illustration
|
*1 |
Front Pretensioner Squib LH |
|
*2 |
Center Airbag Sensor Assembly |
|
*3 |
Floor Wire |
|
*4 |
Connector C |
|
*a |
Front view of wire harness connector (to Front Pretensioner Squib LH) |
HINT:
DTCs other than B1905/74, B1906/74, B1907/74 and B1908/74 may be output at this time, but they are not related to this check.
| OK |
|
REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH (FRONT PRETENSIONER SQUIB LH) |
|
|
3. |
CHECK CONNECTOR |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Disconnect the SST from connector C.
(d) Check that the connector is properly connected to the center airbag sensor assembly.
OK:
The connector is properly connected.
HINT:
If the connector is not connected securely, reconnect the connector and proceed to the next inspection.
(e) Disconnect the connector from the center airbag sensor assembly.
(f) Check that the terminal of the connector is not damaged.
OK:
The terminal is not deformed or damaged.
(g) Check that the short spring for the floor wire connector with the activation prevention mechanism is not deformed or damaged.
OK:
The short spring is not deformed or damaged.
| NG |
|
REPLACE FLOOR WIRE |
|
|
4. |
CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB LH - CENTER AIRBAG SENSOR ASSEMBLY) |
(a) Connect the cable to the negative battery terminal, and wait for at least 2 seconds.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
K4-1 (L+) - Body ground |
Ignition switch ON |
Below 1 V |
|
K4-2 (L-) - Body ground |
Ignition switch ON |
Below 1 V |
Text in Illustration
|
*1 |
Front Pretensioner Squib LH |
|
*2 |
Center Airbag Sensor Assembly |
|
*3 |
Floor Wire |
|
*4 |
Connector C |
|
*a |
Front view of wire harness connector (to Front Pretensioner Squib LH) |
(d) Turn the ignition switch off.
(e) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(f) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K4-1 (L+) - K4-2 (L-) |
Always |
Below 1 Ω |
(g) Release the activation prevention mechanism built into connector B (See page
).
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K4-1 (L+) - K4-2 (L-) |
Always |
1 MΩ or higher |
|
K4-1 (L+) - Body ground |
Always |
1 MΩ or higher |
|
K4-2 (L-) - Body ground |
Always |
1 MΩ or higher |
(i) Restore the released activation prevention mechanism of connector B to the original condition.
| NG |
|
REPLACE FLOOR WIRE |
|
|
5. |
CHECK CENTER AIRBAG SENSOR ASSEMBLY |
(a) Connect the connectors to the front seat outer belt assembly LH and the center airbag sensor assembly.
(b) Connect the cable to the negative battery terminal, and wait for at least 2 seconds.
(c) Turn the ignition switch to ON, and wait for at least 60 seconds.
(d) Clear the DTCs stored in the memory (See page
).
(e) Turn the ignition switch off.
(f) Turn the ignition switch to ON, and wait for at least 60 seconds.
(g) Check the DTCs (See page
).
OK:
DTC B1905/74, B1906/74, B1907/74 or B1908/74 is not output.
Text in Illustration
|
*1 |
Front Pretensioner Squib LH |
|
*2 |
Center Airbag Sensor Assembly |
HINT:
DTCs other than B1905/74, B1906/74, B1907/74 and B1908/74 may be output at this time, but they are not related to this check.
| OK |
|
| NG |
|
|
|