B1620
SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM:
DTC B1620/21 - Driver Side - Side Airbag Sensor Circuit Malfunction
DESCRIPTION
The 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 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 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 for DTCs DTC Check / Clear.
OK:
DTC B1620/21 is not output.
HINT: Codes other than code B1620/21 may be output at this time, but they are not related to this check.
NG -- CHECK CONNECTION OF CONNECTORS
OK -- USE SIMULATION METHOD TO CHECK
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 and the side airbag sensor LH.
OK:
The connectors are connected.
NG -- CONNECT CONNECTORS
OK -- Continue to next step.
3. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH CIRCUIT (OPEN)
(a) Disconnect the connector from the center airbag sensor.
(b) Disconnect the connector from the horn button.
(c) Disconnect the connector from the front passenger airbag.
(d) Disconnect the connector from the No. 1 instrument panel airbag lower.
(e) Disconnect the connector from the front seat airbag LH.
(f) Disconnect the connector from the front seat airbag RH.
(g) Disconnect the connector from the curtain shield airbag LH.
(h) Disconnect the connector from the curtain shield airbag RH.
(i) Disconnect the connector from the front seat outer belt LH.
(j) Disconnect the connector from the front seat outer belt RH.
(k) Using a service wire, connect S9-2 and S9-1 of connector "E".
NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting.
(l) 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 SIDE AIRBAG SENSOR ASSEMBLY LH CIRCUIT (SHORT)
(a) Disconnect the service wire from connector "E".
(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 SIDE AIRBAG SENSOR ASSEMBLY LH CIRCUIT (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 (TO B+)
OK -- Continue to next step.
6. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH CIRCUIT (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 (TO GROUND)
OK -- Continue to next step.
7. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH
(a) Connect the connectors to the center airbag sensor.
(b) Interchange the side airbag sensor 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 for DTCs DTC Check / Clear.
Result
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 front door wire LH connector from the floor wire.
HINT: Connector "E" has already been inserted into the service 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
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 (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 (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