Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Body Integrated Unit Power Supply And Ground Circuit
- CHECK DTC OF BODY INTEGRATED UNIT.
Check DTC of body integrated unit.
Refer to BODY CONTROL SYSTEM (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .
Is the DTC of power line displayed on body integrated unit?
Yes: Repair or replace it according to the DTC.
No: Go to 2.
- CHECK HARNESS BETWEEN BODY INTEGRATED UNIT AND BATTERY.
- Turn the ignition switch to ON.
- Measure the voltage between body integrated unit and chassis ground.
Connector & terminal
(B281) No. 3 (+) - Chassis ground (-):
(B280) No. 32 (+) - Chassis ground (-):
(B281) No. 6 (+) - Chassis ground (-):
(B281) No. 7 (+) - Chassis ground (-):
(i84) No. 6 (+) - Chassis ground (-):
Is the voltage 9 - 16 V?
Yes: Go to 3.
No: Check harness for open circuit between the body integrated unit and the battery or a blown fuse.
- CHECK HARNESS BETWEEN BODY INTEGRATED UNIT AND CHASSIS GROUND.
- Turn the ignition switch to OFF.
- Measure the harness resistance between the body integrated unit and chassis ground.
Connector & terminal
(B280) No. 1 - Chassis ground:
(i84) No. 1 - Chassis ground:
Is the resistance less than 1 Ω?
Yes: Go to 4.
No: Repair the open circuit of harness between the body integrated unit and chassis ground.
- CHECK FOR POOR CONTACT.
Is there poor contact of connector?
Yes: Repair the poor contact.
No: Check body integrated unit.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.