OCCUPANT CLASSIFICATION SYSTEM, Diagnostic DTC:B1785
| DTC Code | DTC Name |
|---|---|
| B1785 | Front Occupant Classification Sensor LH Collision Detection |
DESCRIPTION
DTC B1785 is stored when the occupant detection ECU receives a collision detection signal, which is sent by the front occupant classification sensor LH when an accident occurs.
DTC B1785 is also stored when the separate type front seat cushion spring assembly is subjected to a strong impact, even if an actual accident has not occurred.
However, when the occupant detection ECU outputs a collision detection signal, even if the vehicle has not been in a collision, DTC B1785 can be cleared by conducting the zero point calibration and sensitivity check.
Therefore, if DTC B1785 is output, first perform the zero point calibration and sensitivity check.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
B1785 |
Front Occupant Classification Sensor LH Collision Detection |
|
|
When DTC B1650/32 is stored as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1785 of the occupant classification system.
Use the GTS to check for DTCs of the occupant detection ECU, otherwise the DTCs cannot be read.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
When disconnecting the cable, some systems need to be initialized after the cable is reconnected.
PROCEDURE
CHECK DTC
Turn the power switch to on (IG), and wait for at least 60 seconds.
Clear the DTCs.
Body Electrical > Occupant Detection > Clear DTCs
Tip:First clear the DTCs stored in the occupant detection ECU, and then clear the DTCs stored in the airbag sensor assembly.
Use the GTS to clear the DTCs of the occupant detection ECU, otherwise the DTCs cannot be cleared.
Turn the power switch off.
Turn the power switch to on (IG), and wait for at least 60 seconds.
Check for DTCs.
Body Electrical > Occupant Detection > Trouble Codes
Result
Proceed to
DTC B1785 is not output
DTC B1785 is output
Tip:DTCs other than DTC B1785 may be output at this time, but they are not related to this check.
PERFORM ZERO POINT CALIBRATION
Perform the zero point calibration.
Result
Proceed to
"Zero Point Calibration is complete." is displayed
"Zero Point Calibration is complete." is not displayed
"Zero Point Calibration is complete." is not displayed REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY (FRONT OCCUPANT CLASSIFICATION SENSOR LH)Click here
PERFORM SENSITIVITY CHECK
Perform the sensitivity check.
Standard
27 to 33 kg (59.5 to 72.8 lb)
Result
Proceed to
OK
NG
NG REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY (FRONT OCCUPANT CLASSIFICATION SENSOR LH)Click here
CHECK DTC
Clear the DTCs.
Body Electrical > Occupant Detection > Clear DTCs
Tip:First clear the DTCs stored in the occupant detection ECU, and then clear the DTCs stored in the airbag sensor assembly.
Use the GTS to clear the DTCs of the occupant detection ECU, otherwise the DTCs cannot be cleared.
Turn the power switch off.
Turn the power switch to on (IG), and wait for at least 60 seconds.
Check for DTCs.
Body Electrical > Occupant Detection > Trouble Codes
Result
Proceed to
DTC B1785 is not output
DTC B1785 is output
Tip:DTCs other than DTC B1785 may be output at this time, but they are not related to this check.
DTC B1785 is not output END
DTC B1785 is output REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY (FRONT OCCUPANT CLASSIFICATION SENSOR LH)Click here
REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY (FRONT OCCUPANT CLASSIFICATION SENSOR LH)
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
Replace the separate type front seat cushion spring assembly.
Tip:Perform the inspection using parts from a normal vehicle when possible.
Result
Proceed to
NEXT
PERFORM ZERO POINT CALIBRATION
Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
Turn the power switch to on (IG).
Perform the zero point calibration.
Result
Proceed to
"Zero Point Calibration is complete." is displayed
"Zero Point Calibration is complete." is not displayed
"Zero Point Calibration is complete." is not displayed REPLACE OCCUPANT DETECTION ECUClick here
PERFORM SENSITIVITY CHECK
Perform the sensitivity check.
Standard
27 to 33 kg (59.5 to 72.8 lb)
Result
Proceed to
OK
NG
NG REPLACE OCCUPANT DETECTION ECUClick here
CHECK DTC
Clear the DTCs.
Body Electrical > Occupant Detection > Clear DTCs
Tip:First clear the DTCs stored in the occupant detection ECU, and then clear the DTCs stored in the airbag sensor assembly.
Use the GTS to clear the DTCs of the occupant detection ECU, otherwise the DTCs cannot be cleared.
Turn the power switch off.
Turn the power switch to on (IG), and wait for at least 60 seconds.
Check for DTCs.
Body Electrical > Occupant Detection > Trouble Codes
Result
Proceed to
DTC B1785 is not output
DTC B1785 is output
Tip:DTCs other than DTC B1785 may be output at this time, but they are not related to this check.
DTC B1785 is not output END (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY [FRONT OCCUPANT CLASSIFICATION SENSOR LH] WAS DEFECTIVE)
DTC B1785 is output REPLACE OCCUPANT DETECTION ECUClick here
REPLACE OCCUPANT DETECTION ECU
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
Replace the occupant detection ECU.
Tip:Perform the inspection using parts from a normal vehicle when possible.
Result
Proceed to
NEXT
PERFORM ZERO POINT CALIBRATION
Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
Turn the power switch to on (IG).
Perform the zero point calibration.
Result
Proceed to
"Zero Point Calibration is complete." is displayed
PERFORM SENSITIVITY CHECK
Perform the sensitivity check.
Standard
27 to 33 kg (59.5 to 72.8 lb)
Result
Proceed to
NEXT
NEXT END (OCCUPANT DETECTION ECU WAS DEFECTIVE)