CHECK FRONT SEAT OUTER BELT ASSEMBLY LH
CHECK NO. 2 FLOOR WIRE (FRONT SEAT OUTER BELT ASSEMBLY LH)
DTC B1900/73 Short in Front Driver Side Pretensioner Squib Circuit |
DTC B1901/73 Open in Front Driver Side Pretensioner Squib Circuit |
DTC B1902/73 Short to GND in Front Driver Side Pretensioner Squib Circuit |
DTC B1903/73 Short to B+ in Front Driver Side Pretensioner Squib Circuit |
DESCRIPTION
The front pretensioner squib circuit consists of the center airbag sensor and front seat outer belt assembly LH.This circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are stored when a malfunction is detected in the front seat outer belt assembly LH circuit.
| DTC Code | DTC Detection Condition | Trouble Area |
| B1900/73 | One of the following conditions is met:
|
|
| B1901/73 | One of the following conditions is met:
| |
| B1902/73 | One of the following conditions is met:
| |
| B1903/73 | One of the following conditions is met:
|
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (HILUX_TGN26 RM000004QR1006X.html).
- When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected (HILUX_TGN26 RM000004QR3008X.html).
- HINT:
- To perform the simulation method, enter check mode (signal check) with the intelligent tester (HILUX_TGN26 RM000000XFF0AKX.html), and then wiggle each connector of the airbag system or drive the vehicle on various types of road (HILUX_TGN26 RM000000XFD0FTX.html).
| 1.CHECK FRONT SEAT OUTER BELT ASSEMBLY LH |
Turn the ignition switch off.
 |
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Disconnect the connectors from the front seat outer belt assembly LH.
Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.
- CAUTION:
- Never connect the tester to the front seat outer belt assemblyLH 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 SST.
- Insert SST straight into the terminals of the connector.
- SST
- 09843-18061
Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
Turn the ignition switch to ON, and wait for at least 60 seconds.
Clear the DTCs (HILUX_TGN26 RM000000XFE0FYX.html).
Turn the ignition switch off.
Turn the ignition switch to ON, and wait for at least 60 seconds.
Check for DTCs (HILUX_TGN26 RM000000XFE0FYX.html).
- OK:
- DTC B1900/73, B1901/73, B1902/73 or B1903/73 is not output.
- HINT:
- Codes other than DTC B1900/73, B1901/73, B1902/73 and B1903/73 may be output at this time, but they are not related to this check.
Text in Illustration *1 Front Seat Outer Belt Assembly LH *2 Center Airbag Sensor *3 Connector C *4 SST *a Front view of wire harness connector
(to Front Seat Outer Belt Assembly LH)
|
| ||||
| OK | ||
| ||
| 2.CHECK CONNECTOR |
Turn the ignition switch off.
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Disconnect SST from connector C.
Disconnect the connectors from the center airbag sensor.
Check that the connectors (on the center airbag sensor side and front seat outer belt assembly LH side) are not damaged.
- OK:
- The lock button is not disengaged, and the claw of the lock is not deformed or damaged.
Text in Illustration *1 Front Seat Outer Belt Assembly LH *2 No. 2 Floor Wire *3 Center Airbag Sensor
 |
|
| ||||
| OK | |
| 3.CHECK NO. 2 FLOOR WIRE (FRONT SEAT OUTER BELT ASSEMBLY LH) |
Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
 |
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Switch Condition Specified Condition K41-1 (L+) - Body ground Ignition switch ON Below 1 V K41-2 (L-) - Body ground Ignition switch ON Below 1 V
Turn the ignition switch off.
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition K41-1 (L+) - K41-2 (L-) Always Below 1 Ω
Release the activation prevention mechanism built into connector B (HILUX_TGN26 RM000000XFD0FTX.html).
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition K41-1 (L+) - K41-2 (L-) Always 1 MΩ or higher K41-1 (L+) - Body ground Always 1 MΩ or higher K41-2 (L-) - Body ground Always 1 MΩ or higher
Restore the released activation prevention mechanism of connector B to its original condition.
| *1 | Front Seat Outer Belt Assembly LH |
| *2 | No. 2 Floor Wire |
| *3 | Center Airbag Sensor |
| *4 | Connector C |
| *a | Front view of wire harness connector (to Front Seat Outer Belt Assembly LH) |
|
| ||||
| OK | |
| 4.CHECK CENTER AIRBAG SENSOR |
Connect the connectors to the front seat outer belt assembly LH and center airbag sensor.
 |
Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
Turn the ignition switch to ON, and wait for at least 60 seconds.
Clear the DTCs (HILUX_TGN26 RM000000XFE0FYX.html).
Turn the ignition switch off.
Turn the ignition switch to ON, and wait for at least 60 seconds.
Check for DTCs (HILUX_TGN26 RM000000XFE0FYX.html).
- OK:
- DTC B1900/73, B1901/73, B1902/73 or B1903/73 is not output.
- HINT:
- Codes other than DTC B1900/73, B1901/73, B1902/73 and B1903/73 may be output at this time, but they are not related to this check.
Text in Illustration *1 Front Seat Outer Belt Assembly LH *2 Center Airbag Sensor
|
| ||||
| OK | ||
| ||