B1620

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1620/21; Side Airbag Sensor RH Circuit Malfunction; 2013 MY Corolla [07/2012 -]
B1620/21 - Side Airbag Sensor RH Circuit Malfunction

DESCRIPTION

The side airbag sensor RH circuit consists of the center airbag sensor assembly, side airbag sensor RH, door side airbag sensor RH* and rear airbag sensor RH.

The side airbag sensor RH, door side airbag sensor RH* and rear airbag sensor RH detect impacts to the vehicle and send signals to the center airbag sensor assembly to determine if the airbags should be deployed.

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





*: w/ Daytime Running Light

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CONNECTORS

(a) Turn the ignition switch off.

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

(c) Check that the connectors are properly connected to the center airbag sensor assembly, side airbag sensor RH and rear airbag sensor RH.

OK:

The connectors are properly connected.

HINT
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

(d) Disconnect the connectors from the center airbag sensor assembly, side airbag sensor RH and rear airbag sensor RH.

(e) Check that the terminals of the connectors are not damaged.

OK:

The terminals are not deformed or damaged.

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

2. CHECK NO. 2 FLOOR WIRE (OPEN)

(a) Using SST, connect terminals 8 (BBR+) and 11 (BBR-) of connector B.





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

SST : 09843-18040

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

Standard Resistance:





(c) Disconnect SST from connector B.

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

3. CHECK NO. 2 FLOOR WIRE (SHORT)

(a) 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 NO. 2 FLOOR WIRE (SHORT TO B+)

(a) Connect the cable to the negative (-) battery terminal.





(b) Turn the ignition switch to ON.

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

Standard Voltage:





(d) Turn the ignition switch off.

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

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

5. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND)

(a) 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 NO. 2 FLOOR WIRE (OPEN)

(a) w/ Daytime Running Light

(1) Using SST, connect terminals 4 (BCR+) and 3 (BCR-) of connector C.





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

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

Standard Resistance:





SST : 09843-18040

(b) w/o Daytime Running Light

(1) Using SST, connect terminals 2 (BCR+) and 1 (BCR-) of connector C.





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

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

Standard Resistance:





SST : 09843-18040

(c) Disconnect SST from connector C.

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

7. CHECK NO. 2 FLOOR WIRE (SHORT)

(a) 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.

8. CHECK NO. 2 FLOOR WIRE (SHORT TO B+)

(a) Connect the cable to the negative (-) battery terminal.





(b) Turn the ignition switch to ON.

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

Standard Voltage:





(d) Turn the ignition switch off.

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

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

9. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND)

(a) 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.

10. CHECK SIDE AIRBAG SENSOR RH

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





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

(c) Connect the cable to the negative (-) battery terminal.

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

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

(f) Turn the ignition switch off.

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

(h) Check for DTCs DTC Check / Clear.

Result:





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

(i) Turn the ignition switch off.

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

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

B -- REPLACE SIDE AIRBAG SENSOR RH Removal

C -- USE SIMULATION METHOD TO CHECK Diagnosis System
A -- Continue to next step.

11. CHECK REAR AIRBAG SENSOR RH

(a) Disconnect the connector from the rear airbag sensor RH.





(b) Connect the cable to the negative (-) battery terminal.

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

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

(e) Turn the ignition switch off.

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

(g) Check for DTCs DTC Check / Clear.

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 -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

OK -- REPLACE REAR AIRBAG SENSOR RH Removal