Part 1

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1620/21,B1625/22: Driver Side - Side Airbag Sensor Circuit Malfunction


DESCRIPTION

The side airbag sensor assembly LH consists of parts such as the safing sensor, the diagnostic circuit and the lateral deceleration sensor. The configuration of the side airbag sensor assembly RH is the same as that of the LH.

When the airbag sensor assembly center receives signals from the lateral deceleration sensor, it determines whether or not the SRS should be activated.

DTC B1620/21 is set when a malfunction is detected in the side airbag sensor assembly (driver seat side) circuit.

DTC B1625/22 is set when a malfunction is detected in the side airbag sensor assembly (front passenger seat side) circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
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) Check the DTC DTC Check / Clear.

Result:





D -- USE SIMULATION METHOD TO CHECK

C -- CHECK CONNECTION OF CONNECTORS

B -- CHECK CONNECTION OF CONNECTORS
A -- Continue to next step.

2. CHECK CONNECTION OF CONNECTORS

(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 connectors are properly connected to the center airbag sensor assembly and the side airbag sensor assembly LH.

OK:

The connectors are properly connected.

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

3. CHECK CONNECTORS

(a) Check that the connectors (on the center airbag sensor assembly side and side airbag sensor assembly LH side) are not damaged Electronic Circuit Inspection Procedure.

OK:

The connectors are not deformed or damaged.

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

4. CHECK NO. 2 FLOOR WIRE (FOR OPEN)

SST : 09843-18040

(a) Disconnect the connectors from the center airbag sensor assembly and the side airbag sensor assembly LH.





(b) Using SST, connect S11-4 (BBL+) and S11-3 (BBL-) of connector C.

(c) Measure the resistance.

Standard resistance:





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

5. CHECK NO. 2 FLOOR WIRE (FOR SHORT)

(a) Disconnect the SST from connector C.





(b) Measure the resistance.

Standard resistance:





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

6. CHECK NO. 2 FLOOR WIRE (TO B+)

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





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

(c) Measure the voltage.

Standard voltage:





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

7. CHECK NO. 2 FLOOR WIRE (TO GROUND)

(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) Measure the resistance.

Standard resistance:





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

8. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH

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





(b) Interchange the side airbag sensor assembly RH with the side airbag sensor assembly LH and connect the connectors to them.

(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 the DTCs stored in the memory DTC Check / Clear.

(f) Turn any 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.

Result:





C -- USE SIMULATION METHOD TO CHECK

B -- REPLACE REAR AIRBAG SENSOR LH
A -- Continue to next step.

9. CHECK CONNECTION OF CONNECTORS

(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 connectors are properly connected to the rear airbag sensor LH.

OK:

The connectors are properly connected.

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

10. CHECK CONNECTORS

(a) Check that the connectors (on the side airbag sensor assembly LH side and rear airbag sensor LH side) are not damaged Electronic Circuit Inspection Procedure.

OK:

The connectors are not deformed or damaged.

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

11. CHECK NO. 2 FLOOR WIRE (FOR OPEN)

SST : 09843-18040

(a) Disconnect the connectors from the side airbag sensor assembly LH and the rear airbag sensor LH.





(b) Using SST, connect S13-1 (BCL-) and S13-2 (BCL+) of connector C.

(c) Measure the resistance.

Standard resistance:





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

12. CHECK NO. 2 FLOOR WIRE (FOR SHORT)

(a) Disconnect the SST from connector C.





(b) Measure the resistance.

Standard resistance:





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

13. CHECK NO. 2 FLOOR WIRE (TO B+)

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





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

(c) Measure the voltage.

Standard voltage:





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

14. CHECK NO. 2 FLOOR WIRE (TO GROUND)

(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) Measure the resistance.

Standard resistance:





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

15. CHECK DTC

(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 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 B1620/21 is not output.

HINT
DTCs other than B1620/21 may be output at this time, but they are not related to this check.

OK -- REPLACE REAR AIRBAG SENSOR LH
NG -- Continue to next step.

16. REPLACE CENTER AIRBAG SENSOR ASSEMBLY

(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) Replace the center airbag sensor assembly Removal.

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

(d) Connect the connectors to the center airbag sensor 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:

B1620/21 is not output.

HINT
DTCs other than B1620/21 may be output at this time, but they are not related to this check.

NG -- REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH

OK -- END

17. CHECK CONNECTION OF CONNECTORS

(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 connectors are properly connected to the center airbag sensor assembly and the side airbag sensor assembly RH.

OK:

The connectors are properly connected.

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