DTC B1794: Open in Occupant Classification ECU Battery Positive Line [09/2020 - 11/2021]: Procedure
- CHECK BATTERY VOLTAGE
Result:
NG
INSPECT CHARGING SYSTEM AND BATTERY
for 2GR-FKS: Refer to ON-VEHICLE INSPECTION [10/2017 - ]
for 8AR-FTS: Refer to ON-VEHICLE INSPECTION [08/2015 - ]
Result:
OK
See step 2
- CHECK WIRE HARNESS (SOURCE VOLTAGE)
- Turn the engine switch off.
*a Front view of wire harness connector
(to Occupant Detection ECU) - Disconnect the cable from the negative (-) battery terminal.
- Disconnect the connector from the occupant detection ECU.
- Connect the cable to the negative (-) battery terminal.
- Turn the engine switch on (IG).
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition a14-1 (+B) - Body ground Always 11 to 14 V - Turn the engine switch off.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition a14-3 (GND) - Body ground Always Below 1 Ω Result
Proceed to OK NG
Result:
NG
REPLACE WIRE HARNESS
Result:
OK
See step 3
- Turn the engine switch off.
- CHECK DTC
- Disconnect the cable from the negative (-) battery terminal.
- Connect the connector to the occupant detection ECU.
- Connect the cable to the negative (-) battery terminal.
- Clear the DTCs stored in the occupant detection ECU.
Refer to DTC CHECK / CLEAR [04/2013 - ]
Body Electrical > Occupant Detection > Clear DTCs
- Clear the DTCs stored in the airbag sensor assembly.
Refer to DTC CHECK / CLEAR [09/2020 - ]
Body Electrical > SRS Airbag > Clear DTCs
- Turn the engine switch off.
- Turn the engine switch on (IG), and wait for at least 10 seconds.
- Check for DTCs.
Refer to DTC CHECK / CLEAR [04/2013 - ]
Body Electrical > Occupant Detection > Trouble Codes
OK
DTC B1794 is not output.
HINT:
Codes other than DTC B1794 may be output at this time, but they are not related to this check.
- Turn the engine switch off.
Result
Proceed to OK NG
Result:
OK
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2020 - 11/2021]
Result:
NG
See step 4
- REPLACE OCCUPANT DETECTION ECU
- Disconnect the cable from the negative (-) battery terminal.
- Replace the occupant detection ECU.
Refer to REMOVAL [04/2013 - ]
- Connect the cable to the negative (-) battery terminal.
Result
Proceed to NEXT
Result:
NEXT
See step 5
- PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
Refer to INITIALIZATION [04/2013 - ]
Body Electrical > Occupant Detection > Utility
Tester Display Zero Point Calibration & Sensitivity Check Result
Proceed to NEXT
Result:
NEXT
END
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.