Driver Side - Side Airbag Sensor Assembly Initialization Incomplete - Airbag System

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1623/81: Driver Side - Side Airbag Sensor Assembly Initialization Incomplete
B1623/81 - Driver Side - Side Airbag Sensor Assembly Initialization Incomplete

DESCRIPTION

The side airbag sensor LH and the rear airbag sensor LH consist of parts including the diagnostic circuit and the lateral deceleration sensor.

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

DTC B1623/81 is set when a malfunction is detected in the side airbag sensor LH or rear airbag sensor LH 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.

1. Turn the ignition switch off.

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

3. Disconnect the connector from the center airbag sensor assembly.

4. Disconnect the connectors from the steering pad.

5. Disconnect the connectors from the front passenger airbag assembly.

6. Disconnect the connector from the front seat outer belt assembly LH.

7. Disconnect the connector from the front seat outer belt assembly RH.

8. Disconnect the connector from the front seat side airbag assembly LH.

9. Disconnect the connector from the front seat side airbag assembly RH.

10. Disconnect the connector from the curtain shield airbag assembly LH.

11. Disconnect the connector from the curtain shield airbag assembly RH.

PROCEDURE

1. CHECK DTC OUTPUT

(a) Turn the ignition switch off.

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

(c) Check the DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:





HINT
* DTCs other than DTC B1622/81, B1623/81, B1627/82 and B1628/82 may be output at this time, but they are not related to this check.

C -- GO TO ANOTHER TROUBLESHOOTING B1625

B -- GO TO ANOTHER TROUBLESHOOTING B1620
A -- Continue to next step.

2. CHECK CONNECTORS (CENTER AIRBAG SENSOR ASSEMBLY - SIDE AIRBAG SENSOR LH)

(a) Turn the ignition switch off.

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

(c) Disconnect the No. 2 floor wire connectors from the center airbag sensor assembly and the side airbag sensor LH.

(d) Check the No. 2 floor wire connectors and terminals (on the center airbag sensor assembly and the side airbag sensor LH sides) and check that the connectors are properly connected.

Result:





C -- CONNECT CONNECTORS PROPERLY

B -- REPLACE NO. 2 FLOOR WIRE
A -- Continue to next step.

3. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR ASSEMBLY - SIDE AIRBAG SENSOR LH)





(a) Check for short to B+ in the circuit.

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

(2) Turn the ignition switch to ON.

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

Standard Voltage:





(4) Turn the ignition switch off.

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

(b) Check for open in the circuit.

(1) Using a service wire, connect L4-4 (BBL+) and L4-3 (BBL-) of connector C.

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

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

Standard Resistance:





(c) Check for short in the circuit.

(1) Disconnect the service wire from connector C.

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

Standard Resistance:





(d) Check for short to ground in the circuit.

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

Standard Resistance:





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

4. CHECK CONNECTORS (SIDE AIRBAG SENSOR LH - REAR AIRBAG SENSOR LH)

(a) Turn the ignition switch off.

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

(c) Disconnect the No.2 floor wire connectors from the side airbag sensor LH and the rear airbag sensor LH.

(d) Check the No.2 floor wire connectors and terminals (on the side airbag sensor LH and the rear airbag sensor LH sides) and check that the connectors are properly connected.

Result:





C -- CONNECT CONNECTORS PROPERLY

B -- REPLACE NO. 2 FLOOR WIRE
A -- Continue to next step.

5. CHECK NO. 2 FLOOR WIRE (SIDE AIRBAG SENSOR LH - REAR AIRBAG SENSOR LH)





(a) Check for short to B+ in the circuit.

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

(2) Turn the ignition switch to ON.

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

Standard Voltage:





(4) Turn the ignition switch off.

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

(b) Check for open in the circuit.

(1) Using a service wire, connect L6-1 (BCL-) and L6-2 (BCL+) of connector C.

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

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

Standard Resistance:





(c) Check for short in the circuit.

(1) Disconnect the service wire from connector C.

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

Standard Resistance:





(d) Check for short to ground in the circuit.

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

Standard Resistance:





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

6. CHECK SIDE AIRBAG SENSOR LH

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

(b) Interchange the side airbag sensor LH with the side airbag sensor 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 to ON, and wait for at least 60 seconds.

(e) Clear the DTCs stored in the memory Reading and Clearing Diagnostic Trouble Codes.

(f) Turn the ignition switch off.

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

(h) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:





HINT
DTCs other than DTC B1623/81 and B1628/82 may be output at this time, but they are not related to this check.

C -- USE SIMULATION METHOD TO CHECK Diagnosis System

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

7. CHECK REAR AIRBAG SENSOR LH

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

(b) Interchange the rear airbag sensor LH with the rear airbag sensor 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 to ON, and wait for at least 60 seconds.

(e) Clear the DTCs stored in the memory Reading and Clearing Diagnostic Trouble Codes.

(f) Turn the ignition switch off.

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

(h) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:





HINT
DTCs other than DTC B1623/81 and B1628/82 may be output at this time, but they are not related to this check.

C -- REPLACE REAR AIRBAG SENSOR LH Removal

B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

A -- USE SIMULATION METHOD TO CHECK Diagnosis System