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B1781





SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: B1781: Front Occupant Classification Sensor RH Circuit Malfunction
B1781 - Front Occupant Classification Sensor RH Circuit Malfunction

DESCRIPTION

The front occupant classification sensor RH circuit consists of the occupant classification ECU and the front occupant classification sensor RH.

DTC B1781 is recorded when a malfunction is detected in the front occupant classification sensor RH circuit.





HINT
When DTC B1650/32 is detected as a result of troubleshooting for the AIRBAG SYSTEM, check the DTCs stored in the occupant classification ECU. When DTC B1781 in output, perform troubleshooting for the DTC.

WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
* If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see the under surface of seat cushion.
* In the above case, hold the seat so that it does not fall down. Holding the seat for a long period of time may cause a problem, such as seat rail deformation. Hold the seat only as necessary.

PROCEDURE

1. CHECK DTC

(a) Turn the ignition switch on (IG).

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

(c) for TMC made:

Clear the DTCs stored in the center airbag sensor assembly Airbag System (for TMC Made).

(d) except TMC made:

Clear the DTCs stored in the center airbag sensor assembly Airbag System (except TMC Made).

(e) Turn the ignition switch off.

(f) Turn the ignition switch on (IG).

(g) Check the DTCs Airbag System (for TMC Made).

OK:

DTC B1781 is not output.

HINT
Codes other than DTC B1781 may be output at this time, but they are not related to this check.

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

2. CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

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

(c) Check that the connectors are properly connected to the occupant classification ECU and the front occupant classification sensor RH.

OK:

The connectors are properly connected.

NG -- CONNECT CONNECTORS PROPERLY, THEN GO TO STEP 1
OK -- Continue to next step.

3. CHECK FRONT SEAT WIRE RH (SHORT TO B+)

(a) Disconnect the connectors from the occupant classification ECU and the front occupant classification sensor RH.





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

(c) Turn the ignition switch on (IG).

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

Standard voltage:

for Power seat
for Manual seat










NG -- REPAIR OR REPLACE FRONT SEAT WIRE RH
OK -- Continue to next step.

4. CHECK FRONT SEAT WIRE RH (OPEN)

(a) Turn the ignition switch off.





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

(c) Using a service wire, connect terminals 1 (SVC2) and 3 (SGD2), and connect terminals 2 (SIG2) and 3 (SGD2) of connector C.

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

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

Standard resistance:

for Power seat
for Manual seat










NG -- REPAIR OR REPLACE FRONT SEAT WIRE RH
OK -- Continue to next step.

5. CHECK FRONT SEAT WIRE RH (SHORT)

(a) Disconnect the service wire from connector C.





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

Standard resistance:

for Power seat
for Manual seat










NG -- REPAIR OR REPLACE FRONT SEAT WIRE RH
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:

for Power seat
for Manual seat










NG -- REPAIR OR REPLACE FRONT SEAT WIRE RH
OK -- Continue to next step.

7. CHECK DTC

(a) Connect the connectors to the occupant classification ECU and the front occupant classification sensor RH.

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

(c) Turn the ignition switch on (IG).

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

(e) for TMC made:

Clear the DTCs stored in the center airbag sensor assembly Airbag System (for TMC Made).

(f) except TMC made:

Clear the DTCs stored in the center airbag sensor assembly Airbag System (except TMC Made).

(g) Turn the ignition switch off.

(h) Turn the ignition switch on (IG).

(i) Check the DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1781 is not output.

HINT
Codes other than DTC B1781 may be output at this time, but they are not related to this check.

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

8. REPLACE OCCUPANT CLASSIFICATION ECU

(a) Turn the ignition switch off.

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

(c) Replace the occupant classification ECU Removal.

HINT
Perform the inspection using parts from a normal vehicle if possible.

NEXT -- Continue to next step.

9. PERFORM ZERO POINT CALIBRATION

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

(b) Connect Techstream to the DLC3.

(c) Turn the ignition switch on (IG).

(d) Using Techstream, perform "zero point calibration" Programming and Relearning.

OK:

"Zero Point Calibration is complete." is displayed.

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

10. PERFORM SENSITIVITY CHECK

(a) Using Techstream, perform "sensitivity check" Programming and Relearning.

Standard value:

27 to 33 kg (59.52 to 72.75 lb)

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

11. CHECK DTC

(a) Turn the ignition switch on (IG).

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

(c) for TMC made:

Clear the DTCs stored in the center airbag sensor assembly Airbag System (for TMC Made).

(d) except TMC made:

Clear the DTCs stored in the center airbag sensor assembly Airbag System (except TMC Made).

(e) Turn the ignition switch off.

(f) Turn the ignition switch on (IG).

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

OK:

DTC B1781 is not output.

HINT
Codes other than DTC B1781 may be output at this time, but they are not related to this check.

OK -- END
NG -- Continue to next step.

12. REPLACE FRONT SEAT ASSEMBLY RH

(a) Turn the ignition switch off.

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

(c) Replace the front seat assembly RH Removal for power seat or Removal for manual seat).

NEXT -- Continue to next step.

13. PERFORM ZERO POINT CALIBRATION

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

(b) Connect Techstream to the DLC3.

(c) Turn the ignition switch on (IG).

(d) Using Techstream, perform "zero point calibration" Programming and Relearning.

OK:

"Zero Point Calibration is complete." is displayed.

NEXT -- Continue to next step.

14. PERFORM SENSITIVITY CHECK

(a) Using Techstream, perform "sensitivity check" Programming and Relearning.

Standard value:

27 to 33 kg (59.52 to 72.75 lb)

NEXT -- END
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