Operation CHARM: Car repair manuals for everyone.
Home >> Toyota >> 2010 >> Tacoma PreRunner L4-2.7L (2TR-FE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B1806

B1806





SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1805/52-B1808/52: Short in Front Passenger Side Squib Circuit


DESCRIPTION

The front passenger side squib circuit consists of the center airbag sensor assembly and the front passenger airbag assembly.

The circuit instructs the SRS to deploy when deployment conditions are met.

These DTCs are recorded when a malfunction is detected in the front passenger side squib 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 instrument panel wire assembly connectors (on the front passenger airbag assembly side) are not damaged.

OK:

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

NG -- REPLACE INSTRUMENT PANEL WIRE ASSEMBLY
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 instrument panel wire assembly.

OK:

The connectors are properly connected.

NG -- CONNECT CONNECTORS
OK -- Continue to next step.

4. CHECK INSTRUMENT PANEL WIRE ASSEMBLY (FOR SHORT)

(a) Disconnect the instrument panel wire assembly connectors from the instrument panel wire and front passenger airbag assembly.





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

(c) Measure the resistance.

Standard resistance:





NG -- REPLACE INSTRUMENT PANEL WIRE ASSEMBLY
OK -- Continue to next step.

5. CHECK INSTRUMENT PANEL WIRE (FOR SHORT)

(a) Disconnect the instrument panel wire connector from the center airbag sensor assembly.





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

(c) Measure the resistance.

Standard resistance:





NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.

6. CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the instrument panel wire connectors to the center airbag sensor assembly and instrument panel wire 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 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 B1805 is not output.

HINT
DTCs other than B1805 may be output at this time, but they are not related to this check.

OK -- CHECK FRONT PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB)

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY

7. 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 instrument panel wire assembly connectors (on the front passenger airbag assembly side) are not damaged.

OK:

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

NG -- REPLACE INSTRUMENT PANEL WIRE ASSEMBLY
OK -- Continue to next step.

8. CHECK CONNECTORS

(a) Check that the connectors are properly connected to the center airbag sensor assembly and the instrument panel wire assembly.

OK:

The connectors are properly connected.

NG -- CONNECT CONNECTORS
OK -- Continue to next step.

9. CHECK INSTRUMENT PANEL WIRE ASSEMBLY (FOR OPEN)

(a) Disconnect the spiral cable connectors from the instrument panel wire and steering pad.





(b) Measure the resistance.

Standard resistance:





MG -- REPLACE INSTRUMENT PANEL WIRE ASSEMBLY
OK -- Continue to next step.

10. CHECK INSTRUMENT PANEL WIRE (FOR OPEN)

(a) Disconnect the instrument panel wire connector from the center airbag sensor assembly.





(b) Measure the resistance.

Standard resistance:





OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY

NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE

11. 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 instrument panel wire assembly connectors (on the front passenger airbag assembly side) are not damaged.

OK:

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

NG -- REPLACE INSTRUMENT PANEL WIRE ASSEMBLY
OK -- Continue to next step.

12. CHECK CONNECTION OF CONNECTORS

(a) Check that the connectors are properly connected to the center airbag sensor assembly and the instrument panel wire assembly.

OK:

The connectors are properly connected.

NG -- CONNECT CONNECTORS
OK -- Continue to next step.

13. CHECK INSTRUMENT PANEL WIRE ASSEMBLY (TO GROUND)

(a) Disconnect the spiral cable connectors from the instrument panel wire and steering pad.





(b) Measure the resistance.

Standard resistance:





NG -- REPLACE INSTRUMENT PANEL WIRE ASSEMBLY
OK -- Continue to next step.

14. CHECK INSTRUMENT PANEL WIRE (TO GROUND)

(a) Disconnect the instrument panel wire connector from the center airbag sensor assembly.





(b) Measure the resistance.

Standard resistance:





OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY

NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE

15. 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 instrument panel wire assembly connectors (on the front passenger airbag assembly side) are not damaged.

OK:

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

NG -- REPLACE INSTRUMENT PANEL WIRE ASSEMBLY
OK -- Continue to next step.

16. CHECK CONNECTION OF CONNECTORS

(a) Check that the connectors are properly connected to the center airbag sensor assembly and the instrument panel wire assembly.

OK:

The connectors are properly connected.

NG -- CONNECT CONNECTORS
OK -- Continue to next step.

17. CHECK INSTRUMENT PANEL WIRE ASSEMBLY (TO B+)

(a) Disconnect the spiral cable connectors from the instrument panel wire and steering pad.





(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:





NG -- REPLACE INSTRUMENT PANEL WIRE ASSEMBLY
OK -- Continue to next step.

18. CHECK INSTRUMENT PANEL 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 instrument panel wire connector from the center airbag sensor assembly.

(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 voltage.

Standard voltage:





NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.

19. CHECK CENTER AIRBAG SENSOR ASSEMBLY





HINT
If continuing from step 18, 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 A25-1 (P+) and A25-2 (P-) 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 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 B1806, B1807 and B1808 are not output.

HINT
DTCs other than B1806, B1807 or B1808 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.

20. CHECK FRONT PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB)





HINT
If continuing from step 19, 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 SST from connector C.

(d) Connect the connectors to the front passenger airbag assembly.

(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:

DTCs B1805, B1806, B1807 and B1808 are not output.

HINT
DTCs other than B1805, B1806, B1807 or B1808 may be output at this time, but they are not related to this check.

NG -- REPLACE FRONT PASSENGER AIRBAG ASSEMBLY

OK -- USE SIMULATION METHOD TO CHECK

21. 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 instrument panel wire assembly connectors (on the front passenger airbag assembly side) are not damaged.

OK:

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

NG -- REPLACE INSTRUMENT PANEL WIRE ASSEMBLY
OK -- Continue to next step.

22. CHECK CONNECTORS

(a) Check that the connectors are properly connected to the center airbag sensor assembly and the instrument panel wire assembly.

OK:

The connectors are properly connected.

NG -- CONNECT CONNECTORS
OK -- Continue to next step.

23. CHECK INSTRUMENT PANEL WIRE ASSEMBLY

(a) Disconnect the instrument panel wire assembly connectors from the instrument panel wire and front passenger airbag 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.

(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 D Diagnosis System.

(i) Measure the resistance

Standard resistance:





NG -- REPLACE INSTRUMENT PANEL WIRE ASSEMBLY
OK -- Continue to next step.

24. CHECK INSTRUMENT PANEL WIRE (FRONT PASSENGER SIDE SQUIB)

(a) Restore the released activation prevention mechanism of connector B to the original condition.





(b) Disconnect the instrument panel wire connector from 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.

(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:





NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.

25. CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Replace the front passenger airbag assembly Removal.





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

(b) Connect the instrument panel wire to the center airbag sensor assembly and spiral cable.

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

(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, and wait for at least 60 seconds.

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

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

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

(i) Check for DTCs DTC Check / Clear.

OK:

DTC 52 is not output.

HINT
DTCs other than 52 may be output at this time, but they are not related to this check.

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK -- END
pro multis · About Operation CHARM