B1901

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1900/73: Short in Front Driver Side Pretensioner Squib Circuit

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 driver side front pretensioner squib circuit consists of the center airbag sensor and the front seat outer belt LH.
This circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the front pretensioner squib circuit.






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- Perform the simulation method by selecting the "CHECK MODE" (signal check) with the Techstream Check Mode Procedure.
- After selecting the "CHECK MODE" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on various types of roads Check Mode Procedure.

PROCEDURE

1. CHECK FRONT SEAT OUTER BELT ASSEMBLY LH (DRIVER SIDE FRONT PRETENSIONER SQUIB)




(a) Turn the power switch OFF.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Disconnect the connectors from the front seat outer belt LH.
(d) Connect SST (resistance 2.1 Ohms) to connector C.
CAUTION: Never connect SST to the front seat outer belt LH (driver side front pretensioner squib) 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.

SST: 09843-18061
(e) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(f) Turn the power switch ON (IG), and wait for at least 60 seconds.
(g) Clear the DTCs DTC Check / Clear.
(h) Turn the power switch OFF.
(i) Turn the power switch ON (IG), and wait for at least 60 seconds.
(j) Check the DTCs DTC Check / Clear.
OK:
DTC B1900, B1901, B1902, B1903 or 73 is not output.
HINT: DTCs other than DTC B1900, B1901, B1902, B1903 or 73 may be output at this time, but they are not related to this check.

OK -- REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH
NG -- Continue to next step.

2. CHECK CONNECTOR
(a) Turn the power 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 floor wire connector (on the driver side front seat outer belt) is not damaged.
OK:
The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- Continue to next step.

3. CHECK FLOOR WIRE (DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT)




(a) Disconnect the connector from the center airbag sensor.
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(c) Turn the power switch ON (IG).
(d) Measure the voltage of the wire harness side connector.
Standard voltage:





(e) Turn the power switch OFF.
(f) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(g) Measure the resistance of the wire harness side connector.
Standard resistance:





(h) Release the activation prevention mechanism built into connector B Diagnosis System.
(i) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY