Airbag System (to 12/2010)

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

DESCRIPTION

The side airbag sensor LH consists of the safing sensor, the diagnostic circuit, the lateral deceleration sensor, etc.

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

DTC B1620/21 is recorded when a malfunction is detected in the driver side - side airbag sensor circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC

(a) Turn the ignition switch on (IG), and wait for at least 60 seconds.





(b) Clear the DTCs stored in memory DTC Check / Clear (to 12/2010).

(c) Turn the ignition switch off.

(d) Turn the ignition switch on (IG), and wait for at least 60 seconds.

(e) Check the DTCs DTC Check / Clear (to 12/2010).

OK:

DTC B1620/21 is not output.

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

NG -- CHECK CONNECTION OF CONNECTORS

OK -- USE SIMULATION METHOD TO CHECK

2. CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(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 LH.

OK:

The connectors are connected.

NG -- CONNECT CONNECTORS, THEN GO TO STEP 1
OK -- Continue to next step.

3. CHECK FLOOR WIRE (OPEN)

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





(b) Using a service wire, connect K1-8 (BBD+) and K1-15 (BBD-) of connector "B".

NOTICE:
Do not forcibly insert a service wire into the terminals of the connector when connecting.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





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

4. CHECK FLOOR WIRE (SHORT)

(a) Disconnect the service wire from connector "B".





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





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

5. CHECK FLOOR WIRE (SHORT TO B+)

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





(b) Turn the ignition switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard voltage:





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

6. CHECK FLOOR WIRE (SHORT TO GROUND)

(a) Turn the ignition switch off.





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

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





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

7. CHECK SIDE AIRBAG SENSOR LH

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





(b) Interchange the side airbag sensor RH with 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 on (IG), and wait for at least 60 seconds.

(e) Clear the DTCs stored in memory DTC Check / Clear (to 12/2010).

(f) Turn the ignition switch off.

(g) Turn the ignition switch on (IG), and wait for at least 60 seconds.

(h) Check the DTCs DTC Check / Clear (to 12/2010).

Result:





HINT
Codes other than DTC B1620/21 and B1625/22 may be output at this time, but they are not related to this check.

B -- REPLACE SIDE AIRBAG SENSOR LH

A -- CHECK FLOOR WIRE (SHORT)

C -- USE SIMULATION METHOD TO CHECK

8. CHECK FLOOR WIRE (SHORT)

(a) Turn the ignition switch off.





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

(c) Return the side airbag sensor RH and LH to their original positions and connect the connectors to them.

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

(e) Measure the resistance according to the value(s) in the table below.

Standard resistance:





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

9. CHECK FLOOR WIRE (SHORT TO B+)

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





(b) Turn the ignition switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard voltage:





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

10. CHECK FLOOR WIRE (SHORT TO GROUND)

(a) Turn the ignition switch off.





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

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





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

11. CHECK REAR AIRBAG SENSOR LH

(a) Connect the connector to the side airbag sensor LH.





(b) Interchange the rear airbag sensor LH with RH 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 on (IG), and wait for at least 60 seconds.

(e) Clear the DTCs stored in memory DTC Check / Clear (to 12/2010).

(f) Turn the ignition switch off.

(g) Turn the ignition switch on (IG), and wait for at least 60 seconds.

(h) Check the DTCs DTC Check / Clear (to 12/2010).

Result:





HINT
Codes other than DTC B1620/21 and B1625/22 may be output at this time, but they are not related to this check.

B -- REPLACE REAR AIRBAG SENSOR LH

A -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY

C -- USE SIMULATION METHOD TO CHECK