B1903

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1900/73-B1903/73: Short in Front Driver Side Pretensioner Squib Circuit

DESCRIPTION

The pretensioner squib (driver seat side) circuit consists of the center airbag sensor assembly and the front seat outer belt assembly LH.

This circuit signals the SRS to deploy when airbag deployment conditions are met.

These DTCs are set when a malfunction is detected in the pretensioner squib (driver seat side) circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

CAUTION:
In order to prevent unexpected airbag deployment, disconnect the following connectors before inspecting parts such as wire harnesses, if the application of tester probes to the center airbag sensor assembly connector is necessary.

* (a) Turn the ignition switch to the LOCK position.

* (b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

* (c) Disconnect the connectors from the center airbag sensor assembly.

* (d) Disconnect the connectors from the steering pad.

* (e) Disconnect the connector from the front passenger airbag assembly.

* (f) Disconnect the connector from the front seat airbag assembly LH.

* (g) Disconnect the connector from the front seat airbag assembly RH.

HINT
Skip the following steps if side and curtain shield airbags are not fitted.

* (h) Disconnect the connector from the curtain shield airbag assembly LH.

* (i) Disconnect the connector from the curtain shield airbag assembly RH.

* (j) Disconnect the connector from the front seat outer belt assembly LH.

* (k) Disconnect the connector from the front seat outer belt assembly RH.

PROCEDURE

1. CHECK DTC

(a) Proceed to the appropriate step according to DTC readings.

(1) If using the Techstream (read the 5-digit DTCs): Using the Techstream, check for DTCs DTC Check / Clear.

Result:

(2) If not using the Techstream (read the 2-digit DTCs): Check for DTCs DTC Check / Clear.

Result:

E -- CHECK CONNECTOR

D -- CHECK CONNECTOR

C -- CHECK CONNECTOR

B -- CHECK CONNECTOR
A -- Continue to next step.

2. CHECK CONNECTOR

(a) Turn the ignition switch to the LOCK position.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Check that the connector (on the front seat outer belt assembly LH side) is not damaged.

OK:

The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

NG -- REPAIR OR REPLACE NO. 2 REAR DOOR WIRE (ACCESS CAB)

NG -- REPAIR OR REPLACE NO. 2 FLOOR WIRE (EXCEPT ACCESS CAB)
OK -- Continue to next step.

3. CHECK CONNECTION OF CONNECTORS

(a) Check that the connectors are properly connected to the center airbag sensor assembly and the front airbag sensor LH.

Result:

C -- CONNECT CONNECTORS

B -- CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (FOR SHORT)
A -- Continue to next step.

4. CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (FOR SHORT)

(a) Disconnect the floor wire connectors from the center airbag sensor assembly and front seat outer belt assembly LH.

(b) Release the activation prevention mechanism built into connector B Diagnosis System.

(c) Measure the resistance.

Standard resistance:

NG -- REPAIR OR REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.

5. CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the connectors to the center airbag sensor assembly.

(b) Disconnect the No. 2 rear door wire connector from the front seat outer belt assembly LH.

(c) Release the activation prevention mechanism built into connector B Diagnosis System.

(d) Measure the resistance.

Standard resistance:

OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY
NG -- Continue to next step.

7. CHECK NO. 2 REAR DOOR WIRE (FOR SHORT)

(a) Disconnect the No. 2 floor wire connector from the No. 2 rear door wire.

(b) Release the activation prevention mechanism built into connector D Diagnosis System.

(c) Measure the resistance.

Standard resistance:

NG -- REPAIR OR REPLACE NO. 2 REAR DOOR WIRE

OK -- REPAIR OR REPLACE NO. 2 FLOOR WIRE

8. CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the No. 2 floor wire connectors to the center airbag sensor assembly and No. 2 rear door wire.

(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(c) Turn the ignition switch to the ON position, and wait for at least 60 seconds.

(d) Clear any DTCs stored in the memory DTC Check / Clear.

(e) Turn the ignition switch to the LOCK position.

(f) Turn the ignition switch to the ON position, and wait for at least 60 seconds.

(g) Check for DTCs DTC Check / Clear.

OK:

DTC B1900 is not output.

HINT
DTCs other than B1900 may be output at this time, but they are not related to this check.

OK -- CHECK FRONT SEAT OUTER BELT ASSEMBLY LH

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY

9. CHECK CONNECTOR

(a) Turn the ignition switch to the LOCK position.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Check that the connector (on the front seat outer belt assembly LH side) is not damaged.

OK:

The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

NG -- REPAIR OR REPLACE NO. 2 REAR DOOR WIRE (ACCESS CAB)

NG -- REPAIR OR REPLACE NO. 2 FLOOR WIRE (EXCEPT ACCESS CAB)
OK -- Continue to next step.

10. CHECK CONNECTION OF CONNECTORS

(a) Check that the connectors are properly connected to the center airbag sensor assembly and the front airbag sensor LH.

Result:

C -- CONNECT CONNECTORS

B -- CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (FOR OPEN)
A -- Continue to next step.

11. CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (FOR OPEN)

(a) Disconnect the floor wire connectors from the center airbag sensor assembly and front seat outer belt assembly LH.

(b) Measure the resistance.

Standard resistance:

OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY

NG -- REPAIR OR REPLACE NO. 2 FLOOR WIRE

12. CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (FOR OPEN)

(a) Disconnect the No. 2 floor wire connector from the center airbag sensor assembly.

(b) Disconnect the No. 2 rear door wire connector from the front seat outer belt assembly LH.

(c) Measure the resistance.

Standard resistance:

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
NG -- Continue to next step.

13. CHECK NO. 2 REAR DOOR WIRE (FOR OPEN)

(a) Disconnect the No. 2 floor wire connector from the No. 2 rear door wire.

(b) Measure the resistance.

Standard resistance:

NG -- REPAIR OR REPLACE NO. 2 REAR DOOR WIRE

OK -- REPAIR OR REPLACE NO. 2 FLOOR WIRE

14. CHECK CONNECTOR

(a) Turn the ignition switch to the LOCK position.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Check that the connector (on the front seat outer belt assembly LH side) is not damaged.

OK:

The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

NG -- REPAIR OR REPLACE NO. 2 REAR DOOR WIRE (ACCESS CAB)

NG -- REPAIR OR REPLACE NO. 2 FLOOR WIRE (EXCEPT ACCESS CAB)
OK -- Continue to next step.

15. CHECK CONNECTION OF CONNECTORS

(a) Check that the connectors are properly connected to the center airbag sensor assembly and the front airbag sensor LH.

Result:

C -- CONNECT CONNECTORS

B -- CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (TO GROUND)
A -- Continue to next step.

16. CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (TO GROUND)

(a) Disconnect the floor wire connectors from the center airbag sensor assembly and front seat outer belt assembly LH.

(b) Measure the resistance.

Standard resistance:

OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY

NG -- REPAIR OR REPLACE NO. 2 FLOOR WIRE

17. CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (TO GROUND)

(a) Disconnect the No. 2 floor wire connector from the center airbag sensor assembly.

(b) Disconnect the No. 2 rear door wire connector from the front seat outer belt assembly LH.

(c) Measure the resistance.

Standard resistance:

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
NG -- Continue to next step.

18. CHECK NO. 2 REAR DOOR WIRE (TO GROUND)

(a) Disconnect the No. 2 floor wire connector from the No. 2 rear door wire.

(b) Measure the resistance.

Standard resistance:

NG -- REPAIR OR REPLACE NO. 2 REAR DOOR WIRE

OK -- REPAIR OR REPLACE NO. 2 FLOOR WIRE

19. CHECK CONNECTOR

(a) Turn the ignition switch to the LOCK position.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Check that the connector (on the front seat outer belt assembly LH side) is not damaged.

OK:

The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

NG -- REPAIR OR REPLACE NO. 2 REAR DOOR WIRE (ACCESS CAB)

NG -- REPAIR OR REPLACE NO. 2 FLOOR WIRE (EXCEPT ACCESS CAB)
OK -- Continue to next step.

20. CHECK CONNECTION OF CONNECTORS

(a) Check that the connectors are properly connected to the center airbag sensor assembly and the front airbag sensor LH.

Result:

C -- CONNECT CONNECTORS

B -- CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (TO B+)
A -- Continue to next step.

21. CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (TO B+)

(a) Disconnect the floor wire connectors from the center airbag sensor assembly and front seat outer belt assembly LH.

(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(c) Turn the ignition switch to the ON position.

(d) Measure the voltage.

Standard voltage:

OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY

NG -- REPAIR OR REPLACE NO. 2 FLOOR WIRE

22. CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (TO B+)

(a) Disconnect the No. 2 floor wire connector from the center airbag sensor assembly.

(b) Disconnect the No. 2 rear door wire connector from the front seat outer belt assembly LH.

(c) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(d) Turn the ignition switch to the ON position.

(e) Measure the resistance.

Standard voltage:

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
NG -- Continue to next step.

23. CHECK NO. 2 REAR DOOR WIRE (TO B+)

(a) Turn the ignition switch to the LOCK position.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Disconnect the No. 2 floor wire connector from the No. 2 rear door wire.

(d) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(e) Turn the ignition switch to the ON position.

(f) Measure the resistance.

Standard voltage:

NG -- REPAIR OR REPLACE NO. 2 REAR DOOR WIRE

OK -- REPAIR OR REPLACE NO. 2 FLOOR WIRE

24. CHECK CENTER AIRBAG SENSOR ASSEMBLY

HINT
If continuing from step 21, begin from (a). If continuing from any other step, begin from (c).

(a) Turn the ignition switch to the LOCK position.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Connect the connectors to the center airbag sensor assembly.

(d) Using a service wire, connect F17-1 (PD+) and F17-2 (PD-) of connector C.

NOTICE:
- Twist the end of the service wire in order to insert it into the connector.
- Do not forcibly insert the twisted service wire into the terminals of the connector when connecting.

(e) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(f) Turn the ignition switch to the ON position, and wait for at least 60 seconds.

(g) Clear any DTCs stored in the memory DTC Check / Clear.

(h) Turn the ignition switch to the LOCK position.

(i) Turn the ignition switch to the ON position, and wait for at least 60 seconds.

(j) Check for DTCs DTC Check / Clear.

OK:

DTC B1901, B1902 and B1903 are not output.

HINT
DTCs other than B1901, B1902 or B1903 may be output at this time, but they are not related to this check.

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK -- Continue to next step.

25. CHECK FRONT SEAT OUTER BELT ASSEMBLY LH

HINT
If continuing from step 24, begin from (c). If continuing from any other step, being from (a).

(a) Turn the ignition switch to the LOCK position.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Disconnect the service wire from connector C.

(d) Connect the connector to the front seat outer belt assembly LH.

(e) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(f) Turn the ignition switch to the ON position, and wait for at least 60 seconds.

(g) Clear any DTCs stored in the memory DTC Check / Clear.

(h) Turn the ignition switch to the LOCK position.

(i) Turn the ignition switch to the ON position, and wait for at least 60 seconds.

(j) Check for DTCs DTC Check / Clear.

OK:

DTC B1900, B1901, B1902 and B1903 are not output.

HINT
DTCs other than B1900, B1901, B1902 or B1903 may be output at this time, but they are not related to this check.

NG -- REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH

OK -- USE SIMULATION METHOD TO CHECK

26. REPLACE CENTER AIRBAG SENSOR ASSEMBLY

HINT
If continuing from step 22, begin from (a). If continuing from any other step, begin from (c).

(a) Turn the ignition switch to the LOCK position.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Disconnect the service wire from connector C.

(d) Connect the connector to the front seat outer belt assembly LH.

(e) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(f) Turn the ignition switch to the ON position, and wait for at least 60 seconds.

(g) Clear any DTCs stored in the memory DTC Check / Clear.

(h) Turn the ignition switch to the LOCK position.

(i) Turn the ignition switch to the ON position, and wait for at least 60 seconds.

(j) Check for DTCs DTC Check / Clear.

OK:

DTC B1900, B1901, B1902 and B1903 are not output.

HINT
DTCs other than B1900, B1901, B1902 or B1903 may be output at this time, but they are not related to this check.

NG -- REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH

OK -- USE SIMULATION METHOD TO CHECK

28. CHECK CONNECTOR

(a) Turn the ignition switch to the LOCK position.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Check that the connector (on the front seat outer belt assembly LH side) is not damaged.

OK:

The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

NG -- REPAIR OR REPLACE NO. 2 REAR DOOR WIRE (ACCESS CAB)

NG -- REPAIR OR REPLACE NO. 2 FLOOR WIRE (EXCEPT ACCESS CAB)
OK -- Continue to next step.

29. CHECK CONNECTION OF CONNECTORS

(a) Check that the connectors are properly connected to the center airbag sensor assembly and the front airbag sensor LH.

Result:

C -- CONNECT CONNECTORS

B -- CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT
A -- Continue to next step.

30. CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT

(a) Disconnect the floor wire connectors from the center airbag sensor assembly and front seat outer belt assembly LH.

(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(c) Turn the ignition switch to the ON position.

(d) Measure the voltage.

Standard voltage:

(e) Turn the ignition switch to the LOCK position.

(f) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(g) Measure the resistance.

Standard resistance:

(h) Release the activation prevention mechanism built into connector B Diagnosis System.

(i) Measure the resistance.

Standard resistance:

NG -- REPAIR OR REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.

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

(a) Replace the front seat outer belt assembly LH Removal, Removal or Removal).

HINT
Perform the inspection using parts from a normal vehicle when possible.

(b) Connect the connectors to the center airbag sensor assembly.

(c) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(d) Turn the ignition switch to the ON position, and wait for at least 60 seconds.

(e) Clear any DTCs stored in the memory DTC Check / Clear.

(f) Turn the ignition switch to the LOCK position.

(g) Turn the ignition switch to the ON position, and wait for at least 60 seconds.

(h) Check for DTCs DTC Check / Clear.

OK:

DTC 73 is not output.

HINT
DTCs other than 73 may be output at this time, but they are not related to this check.

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK -- END

32. CHECK DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT

(a) Disconnect the No. 2 floor wire connector from the center airbag sensor assembly.

(b) Disconnect the No. 2 rear door wire connector from the front sear outer belt assembly LH.

(c) Connect the negative (-) terminal cable from the battery, and wait for at least 2 seconds.

(d) Turn the ignition switch to the ON position.

(e) Measure the voltage.

Standard voltage:

(f) Turn the ignition switch to the LOCK position.

(g) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(h) Measure the resistance.

Standard resistance:

(i) Release the activation prevention mechanism built into connector B Diagnosis System.

(j) Measure the resistance.

Standard resistance:

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

33. REPAIR OR REPLACE NO. 2 REAR DOOR WIRE

(a) Disconnect the No. 2 floor wire connector from the No. 2 rear door wire.

(b) Connect the negative (-) terminal cable from the battery, and wait for at least 2 seconds.

(c) Turn the ignition switch to the ON position.

(d) Measure the voltage.

Standard voltage:

(h) Release the activation prevention mechanism built into connector B Diagnosis System.

(i) Measure the resistance.

Standard resistance:

NG -- REPAIR OR REPLACE NO. 2 REAR DOOR WIRE
OK -- Continue to next step.

34. REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH

(a) Replace the front seat outer belt assembly LH Removal, Removal or Removal).

HINT
Perform the inspection using parts from a normal vehicle when possible.

(b) Connect the connectors to the center. Airbag sensor assembly.

(c) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(d) Turn the ignition switch to the ON position, and wait for at least 60 seconds.

(e) Clear any DTCs stored in the memory DTC Check / Clear.

(f) Turn the ignition switch to the LOCK position.

(g) Turn the ignition switch to the ON position, and wait for at least 60 seconds.

(h) Check for DTCs DTC Check / Clear.

OK:

DTC 73 is not output.

HINT
DTCs other than 73 may be output at this time, but they are not related to this check.

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK -- END