Airbag System
AIRBAG SYSTEM: B1620/21: Driver Side - Side Airbag Sensor Circuit Malfunction
DTC B1620/21 - Driver Side - Side Airbag Sensor Circuit Malfunction
DESCRIPTION
The side airbag sensor assembly 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 assembly circuit.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK DTC
(a) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(b) Clear the DTCs stored in memory (DTC Check / Clear).
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position, 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 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 connected.
NG -- CONNECT CONNECTORS, THEN GO TO STEP 1
OK -- Continue to next step.
3. CHECK DRIVER SIDE - SIDE AIRBAG SENSOR ASSEMBLY CIRCUIT (OPEN)
(a) Disconnect the connectors from the center airbag sensor assembly and the side airbag sensor assembly LH.
(b) Using a service wire, connect A21-19 (VUPD) and A21-21 (ESD) of connector "B".
NOTE: 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 -- CHECK FRONT DOOR WIRE LH (OPEN)
OK -- Continue to next step.
4. CHECK DRIVER SIDE - SIDE AIRBAG SENSOR ASSEMBLY CIRCUIT (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 -- CHECK FRONT DOOR WIRE LH (SHORT)
OK -- Continue to next step.
5. CHECK DRIVER SIDE - SIDE AIRBAG SENSOR ASSEMBLY CIRCUIT (SHORT 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 according to the value(s) in the table below.
Standard voltage:
NG -- CHECK FRONT DOOR WIRE LH (SHORT TO B+)
OK -- Continue to next step.
6. CHECK DRIVE SIDE - SIDE AIRBAG SENSOR ASSEMBLY CIRCUIT (SHORT 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 according to the value(s) in the table below.
Standard resistance:
NG -- CHECK FRONT DOOR WIRE LH (SHORT TO GROUND)
OK -- Continue to next step.
7. 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 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 memory (DTC Check / Clear).
(f) Turn the ignition switch to the LOCK position.
(g) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(h) 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 ASSEMBLY LH
A -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
C -- USE SIMULATION METHOD TO CHECK
8. CHECK FRONT DOOR WIRE LH (OPEN)
(a) Disconnect the service wire from connector "B".
(b) Disconnect the front door wire LH connector from the floor wire.
(c) Coupe:
Using a service wire, connect IB1-1 (VUPL) and IB1-2 (ESL) of connector "D".
(d) Convertible:
Using a service wire, connect IB1-2 (VUPL) and IB1-1 (ESL) of connector "D".
NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting.
(e) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE FRONT DOOR WIRE LH
OK -- REPAIR OR REPLACE FLOOR WIRE
9. CHECK FRONT DOOR WIRE LH (SHORT)
(a) Disconnect the front door wire LH connector from the floor wire.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE FRONT DOOR WIRE LH
OK -- REPAIR OR REPLACE FLOOR WIRE
10. CHECK FRONT DOOR WIRE LH (SHORT TO B+)
(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 front door wire LH connector from the floor wire.
(d) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(e) Turn the ignition switch to the ON position.
(f) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPAIR OR REPLACE FRONT DOOR WIRE LH
OK -- REPAIR OR REPLACE FLOOR WIRE
11. CHECK FRONT DOOR WIRE LH (SHORT TO GROUND)
(a) Disconnect the front door wire LH connector from the floor wire.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE FRONT DOOR WIRE LH
OK -- REPAIR OR REPLACE FLOOR WIRE