Airbag System

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

DTC B1620/21 - Driver Side - Side Airbag Sensor Malfunction

DESCRIPTION

The side airbag sensor LH consists of the diagnostic circuit, the lateral deceleration sensor, etc.
If the center airbag sensor assembly receives signals from the lateral deceleration sensor, it determines whether 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 engine switch on (IG), and wait for at least 60 seconds.
(b) Clear the DTCs stored in the memory DTC Check / Clear.
(c) Turn the engine switch off.
(d) Turn the engine switch on (IG), and wait for at least 60 seconds.
(e) Check the 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.

OK -- USE SIMULATION METHOD TO CHECK
NG -- Continue to next step.
2. CHECK SIDE AIRBAG SENSOR LH
(a) Turn the engine switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.




(c) Interchange the side airbag sensor RH with LH and connect the connectors to them.
(d) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(e) Turn the engine switch on (IG), and wait for at least 60 seconds.
(f) Clear the DTCs stored in the memory DTC Check / Clear.
(g) Turn the engine switch off.
(h) Turn the engine switch on (IG), and wait for at least 60 seconds.
(i) Check the DTCs DTC Check / Clear.
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 CENTER AIRBAG SENSOR ASSEMBLY
C -- USE SIMULATION METHOD TO CHECK
3. CHECK CENTER AIRBAG SENSOR ASSEMBLY




(a) Turn the engine 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) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(e) Turn the engine switch on (IG), and wait for at least 60 seconds.
(f) Clear the DTCs stored in the memory DTC Check / Clear.
(g) Turn the engine switch off.
(h) Turn the engine switch on (IG), and wait for at least 60 seconds.
(i) Check the 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 SENOR ASSEMBLY
OK -- USE SIMULATION METHOD TO CHECK