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B1783





SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: B1783: Rear Occupant Classification Sensor RH Circuit Malfunction
B1783 - Rear Occupant Classification Sensor RH Circuit Malfunction

DESCRIPTION

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

DTC B1783 is stored when a malfunction is detected in the rear occupant classification sensor RH circuit.





HINT
* When DTC B1650/32 is stored as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1783 of the occupant classification system.
* Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

HINT
* If troubleshooting (wire harness inspection) is difficult to perform, remove the front seat RH installation bolts to see the undersurface of the 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 problems, such as seat rail deformation. Hold the seat up only for as long as necessary.

PROCEDURE

1. CHECK FOR DTC

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

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
* First clear the DTCs stored in the occupant classification ECU, and then clear the DTCs stored in the center airbag sensor.
* Use the Techstream to clear the DTCs of the occupant classification ECU, otherwise the DTCs cannot be cleared.

(c) Turn the ignition switch off.

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

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

OK:

DTC B1783 is not output.

HINT
DTCs other than DTC B1783 may be output at this time, but they are not related to this check.

NG -- CHECK CONNECTION OF CONNECTOR

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System

2. CHECK CONNECTION OF CONNECTOR

(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 occupant classification ECU and rear occupant classification sensor RH.

OK:

Connectors are properly connected.

NG -- CONNECT CONNECTOR
OK -- Continue to next step.

3. CHECK CONNECTOR

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

(b) Check that the connectors (on the occupant classification ECU side and rear occupant classification sensor RH side) are not damaged Diagnosis System.

OK:

Connectors are not deformed or damaged.

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

4. CHECK FRONT SEAT WIRE RH (REAR OCCUPANT CLASSIFICATION SENSOR RH - OCCUPANT CLASSIFICATION ECU)

(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.





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

Standard Voltage:





(c) Turn the ignition switch off.

(d) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(e) Using service wires, connect terminals 1 (SVC4) and 3 (SGD4), and terminals 2 (SIG4) and 3 (SGD4) of connector C.

NOTICE:
Do not forcibly insert the service wires into the terminals of the connector.

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

Standard Resistance:





(g) Disconnect the service wires from connector C.

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

Standard Resistance:





Text in Illustration





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

5. CHECK FOR DTC

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

(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
* First clear the DTCs stored in the occupant classification ECU, and then clear the DTCs stored in the center airbag sensor.
* Use the Techstream to clear the DTCs of the occupant classification ECU, otherwise the DTCs cannot be cleared.

(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 B1783 is not output.

HINT
DTCs other than DTC B1783 may be output at this time, but they are not related to this check.

NG -- REPLACE OCCUPANT CLASSIFICATION ECU

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System

6. REPLACE OCCUPANT CLASSIFICATION ECU

(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 occupant classification ECU Removal.

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

NEXT -- Continue to next step.

7. PERFORM ZERO POINT CALIBRATION

(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(b) Turn the ignition switch to ON.

(c) Perform the zero point calibration Programming and Relearning.

OK:

"Zero Point Calibration is complete." is displayed.

NG -- REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH
OK -- Continue to next step.

8. PERFORM SENSITIVITY CHECK

(a) Perform the sensitivity check Programming and Relearning.

Standard:

27 to 33 kg (59.5 to 72.8 lb)

NG -- REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH
OK -- Continue to next step.

9. CHECK FOR DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
* First clear the DTCs stored in the occupant classification ECU, and then clear the DTCs stored in the center airbag sensor.
* Use the Techstream to clear the DTCs of the occupant classification ECU, otherwise the DTCs cannot be cleared.

(b) Turn the ignition switch off.

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

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

OK:

DTC B1783 is not output.

HINT
DTCs other than DTC B1783 may be output at this time, but they are not related to this check.

NG -- REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH

OK -- END (OCCUPANT CLASSIFICATION ECU IS DEFECTIVE)

10. REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH

(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 separate type front seat cushion spring RH Disassembly.

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

NEXT -- Continue to next step.

11. PERFORM ZERO POINT CALIBRATION

(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(b) Turn the ignition switch to ON.

(c) Perform the zero point calibration Programming and Relearning.

OK:

"Zero Point Calibration is complete." is displayed.

NEXT -- Continue to next step.

12. PERFORM SENSITIVITY CHECK

(a) Perform the sensitivity check Programming and Relearning.

Standard:

27 to 33 kg (59.5 to 72.8 lb)

NEXT -- END (SEPARATE TYPE FRONT SEAT CUSHION SPRING RH IS DEFECTIVE)
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