B1620

SUPPLEMENTAL RESTRAINT 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 LH consists of the safing sensor, the diagnostic circuit and the lateral deceleration sensor. The center airbag sensor receives signals from the lateral deceleration sensor and determines whether or not the SRS should be activated.
DTC B1620/21 is recorded when a malfunction is detected in the side airbag sensor LH circuit.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC




(a) Turn the power switch ON (IG), and wait for at least 60 seconds.
(b) Clear the DTCs DTC Check / Clear.
(c) Turn the power switch OFF.
(d) Turn the power switch ON (IG), and wait for at least 60 seconds.
(e) Check for DTCs DTC Check / Clear.
OK:
DTC B1620/21 is not output.
HINT: DTCs 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 CONNECTOR
(a) Turn the power 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 and side airbag sensor LH.
OK:
Connectors are connected.
NG -- CONNECT CONNECTOR
OK -- Continue to next step.

3. CHECK FLOOR WIRE (OPEN)




(a) Disconnect the connectors from the center airbag sensor and side airbag sensor LH.
(b) Using a service wire, connect terminals S18-2 (VUPL) and S18-1 (ESL) of connector C.
NOTE: Do not forcibly insert a service wire into the terminals of the connector.
(c) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- Continue to next step.

4. CHECK FLOOR WIRE (SHORT)




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






NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- Continue to next step.

5. CHECK FLOOR WIRE (TO B+)




(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(b) Turn the power switch ON (IG).
(c) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- Continue to next step.

6. CHECK FLOOR WIRE (TO GROUND)




(a) Turn the power switch OFF.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- Continue to next step.

7. CHECK SIDE AIRBAG SENSOR LH




(a) Connect the connector to the center airbag sensor.
(b) Interchange the side airbag sensor LH with the side airbag sensor RH and connect the connectors to them.
(c) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(d) Turn the power switch ON (IG), and wait for at least 60 seconds.
(e) Clear the DTCs DTC Check / Clear.
(f) Turn the power switch OFF.
(g) Turn the power switch ON (IG), and wait for at least 60 seconds.
(h) Check for DTCs DTC Check / Clear.

Result





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

C -- REPLACE SIDE AIRBAG SENSOR LH
B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
A -- USE SIMULATION METHOD TO CHECK