Driver Side - Side Airbag Sensor Circuit Malfunction - Airbag System

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

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

DTC B1625/22 - Front Passenger Side - Side Airbag Sensor Circuit Malfunction

DESCRIPTION

The side airbag sensor LH and RH 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 the SRS should be activated.
DTC B1620/21or B1625/22 is recorded when a malfunction is detected in the side airbag sensor LH or RH circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE
NOTICE:
- When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
- After the ignition switch is turned OFF, the navigation system requires approximately 90 seconds to record various types of memory and settings. As a result, after turning the ignition switch OFF, wait 90 seconds or more before disconnecting the cable from the negative (-) battery terminal.

PROCEDURE

1. CHECK FOR DTC
(a) Turn the ignition switch OFF.
(b) Turn the ignition switch ON, and wait for at least 60 seconds.
(c) Clear the DTCs stored in the memory DTC Check / Clear.
(d) Turn the ignition switch OFF.
(e) Turn the ignition switch ON, and wait for at least 60 seconds.
(f) Check for DTCs DTC Check / Clear.

Result

B -- CHECK CONNECTION OF CONNECTORS
A -- USE SIMULATION METHOD TO CHECK
C -- Continue to next step.
2. CHECK CONNECTION OF CONNECTORS
(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 side airbag sensor RH.
OK:
The connectors are properly connected.
NG -- CONNECT CONNECTORS PROPERLY
OK -- Continue to next step.
3. CHECK CONNECTORS
(a) Disconnect the connectors from the center airbag sensor and side airbag sensor RH.
(b) Check that the connectors (on the center airbag sensor side and side airbag sensor RH side) are not damaged.
OK:
The connectors are not deformed or damaged.
NG -- REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.
4. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - SIDE AIRBAG SENSOR RH)

(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 according to the value(s) in the table below.
Standard voltage:

(d) Turn the ignition switch OFF.
(e) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(f) Using a service wire, connect terminals 8 (BBP+) and 11 (BBP-) of connector B.
NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.
(g) Measure the resistance according to the value(s) in the table below.
Standard resistance:

(h) Disconnect the service wire from connector B.
(i) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.
5. CHECK SIDE AIRBAG SENSOR RH

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

Result

HINT: Codes other than DTC B1620 and B1625 maybe output at this time, but they are not related to this check.
(h) Turn the ignition switch OFF.
(i) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(j) Return the side airbag sensor LH and RH to their original positions and connect the connectors to them.
B -- REPLACE SIDE AIRBAG SENSOR RH
A -- USE SIMULATION METHOD TO CHECK
C -- Continue to next step.
6. CHECK CONNECTION OF CONNECTORS
(a) Check that the connector is properly connected to the door side airbag sensor RH.
OK:
The connector is properly connected.
NG -- CONNECT CONNECTORS PROPERLY
OK -- Continue to next step.
7. CHECK CONNECTORS
(a) Disconnect the connectors from the side airbag sensor RH and door side airbag sensor RH.
(b) Check that the connector (on the door side airbag sensor RH side) is not damaged.
OK:
The connector is not deformed or damaged.
NG -- REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
8. CHECK DOOR SIDE AIRBAG SENSOR RH CIRCUIT

(d) Turn the ignition switch OFF.
(e) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(f) Using a service wire, connect terminals 1 (BCR+) and 2 (BCR-) of connector B.
NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.
(g) Measure the resistance according to the value(s) in the table below.
Standard resistance:

(h) Disconnect the service wire from connector B.
(i) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- CHECK NO. 2 FLOOR WIRE
OK -- Continue to next step.
9. CHECK FOR DTC

(a) Connect the connectors to the side airbag sensor RH.
(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(c) Turn the ignition switch ON, and wait for at least 60 seconds.
(d) Clear the DTCs stored in the memory DTC Check / Clear.
(e) Turn the ignition switch OFF.
(f) Turn the ignition switch ON, and wait for at least 60 seconds.
(g) Check for DTCs DTC Check / Clear.
OK:
DTC B1625 is output.
HINT: Codes other than B1625 maybe output at this time, but they are not related to this check.

NG -- REPLACE DOOR SIDE AIRBAG SENSOR RH
OK -- Continue to next step.
10. CHECK SIDE AIRBAG SENSOR RH

(a) Disconnect the No. 2 floor wire connector from the door wire RH.
(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 according to the value(s) in the table below.
Standard voltage:

(e) Turn the ignition switch OFF.
(f) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(g) Using a service wire, connect terminals 1 (BCR+) and 2 (BCR-) of connector B.
NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.
(h) Measure the resistance according to the value(s) in the table below.
Standard resistance:

(i) Disconnect the service wire from connector B.
(j) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE NO. 2 FLOOR WIRE
OK -- REPLACE DOOR WIRE RH
12. CHECK CONNECTION OF CONNECTORS
(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 side airbag sensor LH.
OK:
The connectors are properly connected.
NG -- CONNECT CONNECTORS PROPERLY
OK -- Continue to next step.
13. CHECK CONNECTORS
(a) Disconnect the connectors from the center airbag sensor and side airbag sensor LH.
(b) Check that the connectors (on the center airbag sensor side and side airbag sensor LH side) are not damaged.
OK:
The connectors are not deformed or damaged.
NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.
14. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - SIDE AIRBAG SENSOR LH)

(d) Turn the ignition switch OFF.
(e) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(f) Using a service wire, connect terminals 8 (BBD+) and 15 (BBD-) of connector B.
NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.
(g) Measure the resistance according to the value(s) in the table below.
Standard resistance:

(h) Disconnect the service wire from connector B.
(i) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.
15. CHECK SIDE AIRBAG SENSOR LH

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

Result

(d) Turn the ignition switch OFF.
(e) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(f) Using a service wire, connect terminals 2 (BCL-) and 1 (BCL+) of connector B.
NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.
(g) Measure the resistance according to the value(s) in the table below.
Standard resistance:

(h) Disconnect the service wire from connector B.
(i) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- CHECK FLOOR WIRE
OK -- Continue to next step.
17. CHECK FOR DTC

(a) Connect the connectors to the side airbag sensor LH.
(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(c) Turn the ignition switch ON, and wait for at least 60 seconds.
(d) Clear the DTCs stored in the memory DTC Check / Clear.
(e) Turn the ignition switch OFF.
(f) Turn the ignition switch ON, and wait for at least 60 seconds.
(g) Check for DTCs DTC Check / Clear.
OK:
DTC B1620 is output.
HINT: Codes other than B1620 maybe output at this time, but they are not related to this check.

NG -- REPLACE DOOR SIDE AIRBAG SENSOR LH
OK -- Continue to next step.
18. CHECK SIDE AIRBAG SENSOR LH

(a) Disconnect the floor wire connector from the 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 according to the value(s) in the table below.
Standard voltage:

(e) Turn the ignition switch OFF.
(f) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(g) Using a service wire, connect terminals 1 (BCL+) and 2 (BCL-) of connector B.
NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.
(h) Measure the resistance according to the value(s) in the table below.
Standard resistance:

(i) Disconnect the service wire from connector B.
(j) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE FLOOR WIRE
OK -- REPLACE DOOR WIRE RH