B1656

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 seat belt buckle switch LH circuit consists of the center airbag sensor assembly and front seat inner belt assembly LH.

DTC B1656/38 is stored when a malfunction is detected in the seat belt buckle switch LH circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CONNECTORS

(a) Turn the power switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(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 front seat inner belt assembly LH.

(e) Check that the terminals of 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 10 (LBE+) and 18 (LBE-) of connector B.





NOTICE:
Do not forcibly insert SST into the terminals of the connector when connecting the wire.

SST : 09843-18040

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





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:





Text in Illustration





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 power switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





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

5. CHECK FLOOR WIRE (SHORT TO GROUND)

(a) Turn the power switch off.





(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





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 front seat inner belt assembly LH.





(b) Connect the cable to the negative (-) battery terminal.

(c) Turn the power switch on (IG), and wait for at least 60 seconds.

(d) Clear the DTCs stored in the memory DTC Check / Clear.

(e) Turn the power switch off.

(f) Turn the power switch on (IG), and wait for at least 60 seconds.

(g) Check for DTCs DTC Check / Clear.

OK:

DTC B1656/38 is not output.

Text in Illustration





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 How To Proceed With Troubleshooting

7. REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

(a) Turn the power switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Replace the front seat inner belt assembly LH with a known good one 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 power switch on (IG), and wait for at least 60 seconds.

(c) Clear the DTCs stored in the memory DTC Check / Clear.

(d) Turn the power switch off.

(e) Turn the power switch on (IG), and wait for at least 60 seconds.

(f) Check for DTCs DTC Check / Clear.

OK:

DTC B1656/38 is not output.

Text in Illustration





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