B1655

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1655; Seat Belt Buckle Switch (RH); 2013 MY FR-S [03/2012 -]
B1655 - Seat Belt Buckle Switch (RH)

DESCRIPTION

The seat belt buckle switch RH circuit consists of the occupant detection ECU, airbag ECU assembly and front seat inner belt assembly RH.

DTC B1655 is stored when a malfunction is detected in the seat belt buckle switch RH circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work Service Precautions.

HINT
If DTC B1650 has been stored, check the errors with respect to that DTC first.

PROCEDURE

1. CHECK DTC (OCCUPANT CLASSIFICATION SYSTEM)

(a) Check for DTCs of the occupant classification system Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- GO TO OCCUPANT CLASSIFICATION SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Occupant Classification System
A -- Continue to next step.

2. CHECK CONNECTORS

(a) Turn the ignition switch off.

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

(c) Check that the connectors are properly connected to the occupant detection ECU and front seat inner belt assembly RH.

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 occupant detection ECU and front seat inner belt assembly RH.

(e) Check that the terminals of the connectors are not damaged.

OK:

The terminals are not deformed or damaged.

NG -- REPLACE FRONT SEAT ASSEMBLY RH Removal
OK -- Continue to next step.

3. CHECK FRONT SEAT WIRE RH (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:





(d) Turn the ignition switch off.

(e) 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.

NG -- REPLACE FRONT SEAT ASSEMBLY RH Removal
OK -- Continue to next step.

4. CHECK FRONT SEAT WIRE RH (OPEN)

(a) Using a service wire, connect terminals 1 and 2 of connector C.

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

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









Standard Resistance:





(c) Disconnect the service wire from connector C.

NG -- REPLACE FRONT SEAT ASSEMBLY RH Removal
OK -- Continue to next step.

5. CHECK FRONT SEAT WIRE RH (SHORT)

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









Standard Resistance:





NG -- REPLACE FRONT SEAT ASSEMBLY RH Removal
OK -- Continue to next step.

6. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND)

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









Standard Resistance:





NG -- REPLACE FRONT SEAT ASSEMBLY RH Removal
OK -- Continue to next step.

7. CHECK DTC

(a) Connect the connectors to the occupant detection ECU and front seat inner belt assembly RH.

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

(c) Clear the DTCs stored in the occupant detection ECU Reading and Clearing Diagnostic Trouble Codes.

(d) Clear the DTCs stored in the airbag ECU assembly Reading and Clearing Diagnostic Trouble Codes.

(e) Turn the ignition switch off.

(f) Turn the ignition switch to ON, and wait for at least 60 seconds.

(g) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1655 is not output.

HINT
Codes other than DTC B1655 may be output at this time, but they are not related to this check.

(h) Turn the ignition switch off.

NG -- CHECK FRONT SEAT INNER BELT ASSEMBLY LH

OK -- USE SIMULATION METHOD TO CHECK

8. CHECK FRONT SEAT INNER BELT ASSEMBLY LH

(a) 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.

(b) Replace the front seat inner belt assembly RH with a known good one Removal.

HINT
Perform the following inspection using known good parts from another vehicle if possible.

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

(d) Clear the DTCs stored in the occupant detection ECU Reading and Clearing Diagnostic Trouble Codes.

(e) Clear the DTCs stored in the airbag ECU assembly Reading and Clearing Diagnostic Trouble Codes.

(f) Turn the ignition switch off.

(g) Turn the ignition switch to ON, and wait for at least 60 seconds.

(h) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1655 is not output.

HINT
Codes other than DTC B1655 may be output at this time, but they are not related to this check.

(i) Turn the ignition switch off.

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

(k) Restore the front seat inner belt assembly RH that was installed for testing to its original location Removal.

NG -- CHECK FRONT SEAT ASSEMBLY RH

OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Removal

9. CHECK FRONT SEAT ASSEMBLY RH

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

(b) Replace the front seat assembly RH with a new one Removal.

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

(d) Connect the connectors to the occupant detection ECU and front seat inner belt assembly RH.

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

(f) Clear the DTCs stored in the occupant detection ECU Reading and Clearing Diagnostic Trouble Codes.

(g) Clear the DTCs stored in the airbag ECU assembly Reading and Clearing Diagnostic Trouble Codes.

(h) Turn the ignition switch off.

(i) Turn the ignition switch to ON, and wait for at least 60 seconds.

(j) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1655 is not output.

HINT
Codes other than DTC B1655 may be output at this time, but they are not related to this check.

NG -- REPLACE AIRBAG ECU ASSEMBLY Removal

OK -- END (FRONT SEAT ASSEMBLY RH WAS DEFECTIVE)