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 assembly and the front seat inner belt assembly 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 engine switch on (IG), and wait for at least 60 seconds.
(b) Clear the DTCs stored in memory DTC Check / Clear.
(c) Turn the engine switch off.
(d) Turn the engine switch on (IG), and wait for at least 60 seconds.
(e) Check the 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.

OK -- USE SIMULATION METHOD TO CHECK
NG -- Continue to next step.

2. CHECK CONNECTION OF CONNECTORS
(a) Turn the engine 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 assembly and the front seat inner belt assembly LH.
OK:
The connectors are connected.
NG -- CONNECT CONNECTORS, THEN GO TO STEP 1
OK -- Continue to next step.

3. CHECK FLOOR WIRE NO.2 (OPEN)




(a) Disconnect the connectors from the center airbag sensor assembly and the front seat inner belt assembly LH.
(b) Using a service wire, connect V16-15 (LBE+) and V16-23 (LBE-) of connector "B".
NOTE:
Do not forcibly insert a service wire into the terminals of the connector when connecting.
(c) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE FLOOR WIRE NO.2
OK -- Continue to next step.

4. CHECK FLOOR WIRE NO.2 (SHORT)




(a) Disconnect the service wire from connector "B".
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE FLOOR WIRE NO.2
OK -- Continue to next step.

5. CHECK FLOOR WIRE NO.2 (SHORT TO B+)




(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Voltage:






NG -- REPAIR OR REPLACE FLOOR WIRE NO.2
OK -- Continue to next step.

6. CHECK FLOOR WIRE NO.2 (SHORT TO GROUND)




(a) Turn the engine switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE FLOOR WIRE NO.2
OK -- Continue to next step.

7. CHECK FRONT SEAT INNER BELT ASSEMBLY LH




(a) Connect the connector to the center airbag sensor assembly and the front seat inner belt assembly LH.
(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(c) Turn the engine switch on (IG), and wait for at least 60 seconds.
(d) Clear the DTCs stored in memory DTC Check / Clear.
(e) Turn the engine switch off.
(f) Turn the engine switch on (IG), and wait for at least 60 seconds.
(g) Check the 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.

OK -- USE SIMULATION METHOD TO CHECK
NG -- Continue to next step.

8. REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
(a) Turn the engine switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Replace the front seat inner belt assembly LH Removal.
HINT: Perform the inspection using parts from a normal vehicle if possible.

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 engine switch on (IG), and wait for at least 60 seconds.
(c) Clear the DTCs stored in memory DTC Check / Clear.
(d) Turn the engine switch off.
(e) Turn the engine switch on (IG), and wait for at least 60 seconds.
(f) Check the 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
OK -- END