B1656

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1656/38: Seat Belt Buckle Switch LH Circuit Malfunction

DTC B1656/38 - Seat Belt Buckle Switch LH Circuit Malfunction

DESCRIPTION

The seat belt buckle switch LH circuit consists of the center airbag sensor and the front seat inner belt LH.
DTC B1656/38 is recorded when a malfunction is detected in the seat belt buckle switch 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 B1656/38 is not output.
HINT: Codes other than DTC B1656/38 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 front seat inner belt LH.
OK:
The connectors are connected.
NG -- CONNECT CONNECTORS
OK -- Continue to next step.
3. CHECK NO. 2 FLOOR WIRE (OPEN)




(a) Disconnect the connectors from the center airbag sensor and the front seat inner belt LH.
(b) Using a service wire, connect terminals A20-10 (LBE+) and A20-18 (LBE-) 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 -- Continue to next step.
4. CHECK NO. 2 FLOOR WIRE (SHORT)




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






NG -- REPAIR OR REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.
5. CHECK NO. 2 FLOOR WIRE (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 -- REPAIR OR REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.
6. CHECK NO. 2 FLOOR WIRE (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 -- REPAIR OR REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.
7. CHECK FRONT SEAT INNER BELT ASSEMBLY LH




(a) Connect the connector to the center airbag sensor and the front seat inner belt 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 memory Reading and Clearing Diagnostic Trouble Codes.
(e) Turn the ignition switch OFF.
(f) Turn the ignition switch ON, and wait for at least 60 seconds.
(g) Check the DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1656/38 is not output.
HINT: Codes other than DTC B1656/38 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.
8. REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
(a) Turn the ignition switch OFF.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Temporarily replace the front seat inner belt LH with a new or normal functioning one Removal.
NEXT -- Continue to next step.
9. CHECK CENTER AIRBAG SENSOR ASSEMBLY




(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(b) Turn the ignition switch ON, and wait for at least 60 seconds.
(c) Clear the DTCs stored in memory Reading and Clearing Diagnostic Trouble Codes.
(d) Turn the ignition switch OFF.
(e) Turn the ignition switch ON, and wait for at least 60 seconds.
(f) Check the DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1656/38 is not output.
HINT: Codes other than DTC B1656/38 may be output at this time, but they are not related to this check.

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK -- USE SIMULATION METHOD TO CHECK