B1908

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1905/74: Short in Front Passenger Side Pretensioner Squib Circuit

DTC B1905/74 - Short in Front Passenger Side Pretensioner Squib Circuit

DTC B1906/74 - Open in Front Passenger Side Pretensioner Squib Circuit

DTC B1907/74 - Short to GND in Front Passenger Side Pretensioner Squib Circuit

DTC B1908/74 - Short to B+ in Front Passenger Side Front Pretensioner Squib Circuit

DESCRIPTION

The pretensioner squib (front passenger seat side) circuit consists of the center airbag sensor assembly and the front seat outer belt assembly RH.
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 (front passenger 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 (Reading and Clearing Diagnostic Trouble Codes).
Result:

(2) If not using the Techstream (read the 2-digit DTCs): Check for DTCs (Reading and Clearing Diagnostic Trouble Codes).
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 RH 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. 1 REAR DOOR WIRE (ACCESS CAB)
NG -- REPAIR OR REPLACE 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 RH.
Result:

C -- CONNECT CONNECTORS
B -- CHECK FRONT PASSENGER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (FOR SHORT)
A -- Continue to next step.
4. CHECK FRONT PASSENGER 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 RH.
(b) Release the activation prevention mechanism built into connector B (Diagnosis System).
(c) Measure the resistance.
Standard resistance:

NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- Continue to next step.
5. CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the connectors to the center airbag sensor assembly.
(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 (Reading and Clearing Diagnostic Trouble Codes).
(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 (Reading and Clearing Diagnostic Trouble Codes).
OK:
DTC B1905 is not output.

HINT: DTCs other than B1905 may be output at this time, but they are not related to this check.

OK -- CHECK FRONT SEAT OUTER BELT ASSEMBLY RH
NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
6. CHECK FRONT PASSENGER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (FOR SHORT)

(a) Disconnect the floor wire connector from the center airbag sensor assembly.
(b) Disconnect the No. 1 rear door wire connector from the front seat outer belt assembly RH.
(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. 1 REAR DOOR WIRE (FOR SHORT)

(a) Disconnect the floor wire connector from the No. 1 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. 1 REAR DOOR WIRE
OK -- REPAIR OR REPLACE FLOOR WIRE
8. CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the floor wire connectors to the center airbag sensor assembly and No. 1 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 (Reading and Clearing Diagnostic Trouble Codes).
(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 (Reading and Clearing Diagnostic Trouble Codes).
OK:
DTC B1905 is not output.

HINT: DTCs other than B1905 may be output at this time, but they are not related to this check.

OK -- CHECK FRONT SEAT OUTER BELT ASSEMBLY RH
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 RH 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. 1 REAR DOOR WIRE (ACCESS CAB)
NG -- REPAIR OR REPLACE 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 RH.
C -- CONNECT CONNECTORS
B -- CHECK FRONT PASSENGER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (FOR OPEN)
A -- Continue to next step.
11. CHECK FRONT PASSENGER 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 RH.
(b) Measure the resistance.
Standard resistance:

OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY
NG -- REPAIR OR REPLACE FLOOR WIRE
12. CHECK FRONT PASSENGER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (FOR OPEN)

(a) Disconnect the floor wire connector from the center airbag sensor assembly.
(b) Disconnect the No. 1 rear door wire connector from the front seat outer belt assembly RH.
(c) Measure the resistance.
Standard resistance:

OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY
NG -- Continue to next step.
13. CHECK NO. 1 REAR DOOR WIRE (FOR OPEN)

(a) Disconnect the floor wire connector from the No. 1 rear door wire.
(b) Measure the resistance.
Standard resistance:

NG -- REPAIR OR REPLACE NO. 1 REAR DOOR WIRE
OK -- REPAIR OR REPLACE 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 RH 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. 1 REAR DOOR WIRE (ACCESS CAB)
NG -- REPAIR OR REPLACE 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 enter airbag sensor assembly and the front airbag sensor RH.
Result:

C -- CONNECT CONNECTORS
B -- CHECK FRONT PASSENGER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (TO GROUND)
A -- Continue to next step.
16. CHECK FRONT PASSENGER 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 RH.
(b) Measure the resistance.
Standard resistance:

OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY
NG -- REPAIR OR REPLACE FLOOR WIRE
17. CHECK FRONT PASSENGER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (TO GROUND)

OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY
NG -- Continue to next step.
18. CHECK NO. 1 REAR DOOR WIRE (TO GROUND)

(a) Disconnect the floor wire connector from the No. 1 rear door wire.
(b) Measure the resistance.
Standard resistance:

NG -- REPAIR OR REPLACE NO. 1 REAR DOOR WIRE
OK -- REPAIR OR REPLACE 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 RH 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. 1 REAR DOOR WIRE (ACCESS CAB)
NG -- REPAIR OR REPLACE 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 RH.
Result:

C -- CONNECT CONNECTORS
B -- CHECK FRONT PASSENGER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (TO B+)
A -- Continue to next step.
21. CHECK FRONT PASSENGER 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 RH.
(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 FLOOR WIRE
22. CHECK FRONT PASSENGER SIDE FRONT PRETENSIONER SQUIB CIRCUIT (TO B+)

(a) Disconnect the floor wire connector from the center airbag sensor assembly.
(b) Disconnect the No. 1 rear door wire connector from the front seat outer belt assembly RH.
(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 voltage.
Standard voltage:

OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY
NG -- Continue to next step.
23. CHECK NO. 1 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 floor wire connector from the No. 1 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. 1 REAR DOOR WIRE
OK -- REPAIR OR REPLACE 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 F18-1 (PP+) and F18-2 (PP-) 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 (Reading and Clearing Diagnostic Trouble Codes).
(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 (Reading and Clearing Diagnostic Trouble Codes).
OK:
DTC B1906, B1907 and B1908 are not output.

HINT: DTCs other than B1906, B1907 or B1908 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 RH

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) Connect the connectors to the center airbag sensor assembly.
(d) Using a service wire, connect F18-1 (PP+) and F18-2 (PP-) of connector E.

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 (Reading and Clearing Diagnostic Trouble Codes).
(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 (Reading and Clearing Diagnostic Trouble Codes).
OK:
DTC B1906, B1907 and B1908 are not output.

HINT: DTCs other than B1906, B1907 or B1908 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.
27. CHECK FRONT SEAT OUTER BELT ASSEMBLY RH

HINT: If continuing from step 26, 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 RH.
(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 (Reading and Clearing Diagnostic Trouble Codes).
(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 (Reading and Clearing Diagnostic Trouble Codes).
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 RH
OK -- OTHERS 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 RH 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. 1 REAR DOOR WIRE (ACCESS CAB)
NG -- REPAIR OR REPLACE 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 RH.
Result:

C -- CONNECT CONNECTORS
B -- CHECK FRONT PASSENGER SIDE FRONT PRETENSIONER SQUIB CIRCUIT
A -- Continue to next step.
30. CHECK FRONT PASSENGER SIDE FRONT PRETENSIONER SQUIB CIRCUIT

(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 FLOOR WIRE
OK -- Continue to next step.
31. REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH (FRONT PASSENGER SEAT SIDE PRETENSIONER SQUIB)

(a) Replace the front seat outer belt assembly RH.

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 (Reading and Clearing Diagnostic Trouble Codes).
(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 (Reading and Clearing Diagnostic Trouble Codes).
OK:
DTC 74 is not output.

HINT: DTCs other than 74 may be output at this time, but they are not related to this check.

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK -- END
32. CHECK FRONT PASSENGER SIDE FRONT PRETENSIONER SQUIB CIRCUIT

(a) Disconnect the floor wire connector from the center airbag sensor assembly.
(b) Disconnect the No. 1 rear door wire connector from the front seat outer belt assembly RH.
(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 RH
NG -- Continue to next step.
33. CHECK NO. 1 REAR DOOR WIRE

(a) Disconnect the floor wire connector from the No. 1 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 D (Diagnosis System).
(i) Measure the resistance.
Standard resistance:

NG -- REPAIR OR REPLACE NO. 1 REAR DOOR WIRE
OK -- Continue to next step.
34. REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH