Airbag System

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1625/22: Side Airbag Sensor LH Circuit Malfunction

DTC B1625/22 - Side Airbag Sensor LH Circuit Malfunction

DESCRIPTION

The door side airbag sensor LH consists of the safing sensor, the diagnostic circuit, the lateral deceleration sensor, etc.
If the center airbag sensor receives signals from the lateral deceleration sensor, it determines whether or not the SRS should be activated.
DTC B1625/22 is recorded when a malfunction is detected in the door side airbag sensor LH circuit.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC




(a) Turn the ignition switch ON, and wait for at least 60 seconds.
(b) Clear the DTCs stored in memory Reading and Clearing Diagnostic Trouble Codes.
(c) Turn the ignition switch OFF.
(d) Turn the ignition switch ON, and wait for at least 60 seconds.
(e) Check the DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1625/22 is not output.
HINT: Codes other than DTC B1625/22 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 CONNECTOR
(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 and the door side airbag sensor LH.
OK:
The connectors are connected.
NG -- CONNECT CONNECTORS
OK -- Continue to next step.
3. CHECK DOOR SIDE AIRBAG SENSOR LH CIRCUIT (OPEN)




(a) Disconnect the connectors from the center airbag sensor and the door side airbag sensor LH.
(b) Using a service wire, connect terminals A20-19 (VUPL) and A20-21 (ESL) of connector "B".
NOTE:
Do not forcibly insert a service wire into the terminals of the connector when connecting.
(c) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- CHECK NO. 2 FLOOR WIRE (OPEN)
OK -- Continue to next step.
4. CHECK DOOR SIDE AIRBAG SENSOR LH CIRCUIT (SHORT)




(a) Disconnect the service wire from connector "B".
(b) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- CHECK NO. 2 FLOOR WIRE (SHORT)
OK -- Continue to next step.
5. CHECK DOOR SIDE AIRBAG SENSOR LH 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 ON.
(c) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- CHECK NO. 2 FLOOR WIRE (SHORT TO B+)
OK -- Continue to next step.
6. CHECK DOOR SIDE AIRBAG SENSOR LH CIRCUIT (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 of the wire harness side connector.
Standard resistance:






NG -- CHECK NO. 2 FLOOR WIRE
OK -- Continue to next step.
7. CHECK DOOR SIDE AIRBAG SENSOR LH




(a) Connect the connectors to the center airbag sensor.
(b) Interchange the door side 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, and wait for at least 60 seconds.
(e) Clear the DTCs stored in memory Reading and Clearing Diagnostic Trouble Codes.
(f) Turn the ignition switch OFF.
(g) Turn the ignition switch ON, and wait for at least 60 seconds.
(h) Check the DTCs Reading and Clearing Diagnostic Trouble Codes.

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 DOOR SIDE AIRBAG SENSOR ASSEMBLY LH
A -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
C -- USE SIMULATION METHOD TO CHECK
8. CHECK NO. 2 FLOOR WIRE (OPEN)




(a) Disconnect the connectors from the No. 2 floor wire and door wire LH.
(b) Using a service wire, connect terminals A20-19 (VUPL) and A20-21 (ESL) of connector "B".
NOTE:
Do not forcibly insert a service wire into the terminals of the connector when connecting.
(c) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE NO. 2 FLOOR WIRE
OK -- REPAIR OR REPLACE DOOR WIRE LH
9. CHECK NO. 2 FLOOR WIRE (SHORT)




(a) Disconnect the connectors from the No. 2 floor wire and door wire LH.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE NO. 2 FLOOR WIRE
OK -- REPAIR OR REPLACE DOOR WIRE LH
10. CHECK NO. 2 FLOOR WIRE (SHORT TO B+)




(a) Disconnect the connectors from the No. 2 floor wire and door wire LH.
(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(c) Turn the ignition switch ON.
(d) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- CHECK NO. 2 FLOOR WIRE
OK -- REPAIR OR REPLACE DOOR WIRE LH
11. CHECK NO. 2 FLOOR WIRE




(a) Disconnect the connectors from the No. 2 floor wire and door wire LH.
(b) Turn the ignition switch OFF.
(c) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(d) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- CHECK NO. 2 FLOOR WIRE
OK -- REPAIR OR REPLACE DOOR WIRE LH