Seat Belt Buckle Switch LH Circuit Malfunction - Airbag System
SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1656/38: Seat Belt Buckle Switch LH Circuit Malfunction
B1656/38 - Seat Belt Buckle Switch LH Circuit Malfunction
DESCRIPTION
The driver side seat belt buckle switch circuit consists of the center airbag sensor assembly and the front seat inner belt assembly LH.
DTC B1656/38 is recorded when a malfunction is detected in the driver side seat belt buckle switch circuit.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK CONNECTORS
(a) Turn the ignition 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 assembly and front seat inner belt assembly LH.
OK:
The connectors are properly connected.
HINT
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.
(d) Disconnect the connectors from the center airbag sensor assembly and the front seat inner belt assembly LH.
(e) Check that the terminals of the connectors are not damaged.
OK:
The terminals are not deformed or damaged.
NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.
2. CHECK FLOOR WIRE (OPEN)
(a) Using SST, connect terminals 11 (LBE+) and 12 (LBE-) of connector B.
NOTICE:
Do not forcibly insert SST into the terminals of the connector.
SST : 09843-18040
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.
3. CHECK FLOOR WIRE (SHORT)
(a) Disconnect SST from connector B.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.
4. CHECK FLOOR WIRE (SHORT TO B+)
(a) Connect the cable to the negative (-) battery terminal.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.
5. CHECK FLOOR WIRE (SHORT TO GROUND)
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.
6. CHECK FRONT SEAT INNER BELT ASSEMBLY LH
(a) Connect the connectors to the center airbag sensor assembly and the front seat inner belt assembly LH.
(b) Connect the cable to the negative (-) battery terminal.
(c) Turn the ignition switch to 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 to ON, and wait for at least 60 seconds.
(g) Check for DTCs DTC Check / Clear.
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 FRONT SEAT INNER BELT ASSEMBLY LH
OK -- USE SIMULATION METHOD TO CHECK Diagnosis System
7. REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Replace the front seat inner belt assembly LH with a known good part Removal.
HINT
Perform the following inspection using known good parts from another vehicle if possible.
NEXT -- Continue to next step.
8. CHECK CENTER AIRBAG SENSOR ASSEMBLY
(a) Connect the cable to the negative (-) battery terminal.
(b) Turn the ignition switch to 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 to ON, and wait for at least 60 seconds.
(f) Check for DTCs DTC Check / Clear.
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 Removal
OK -- END