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.
Check Body Integrated Unit Power Supply And Ground Circuit
- CHECK POWER SUPPLY
.
- Disconnect the connector of body integrated unit.
- Measure the voltage between the body integrated unit connector and chassis ground.
Connector & terminal
(B152) No. 3 (+) - Chassis ground (-):
(B280) No. 1 (+) - Chassis ground (-):
(B281) No. 7 (+) - Chassis ground (-):
(B287) No. 4 (+) - Chassis ground (-):
Is the voltage 9 V or more?
Yes: Go to 2.
No: Check the harness for open or short circuit between body integrated unit and fuse.
- CHECK GROUND CIRCUIT
.
Measure the resistance between the body integrated unit connector and chassis ground.
Connector & terminal
(i84) No. 4 - Chassis ground:
(B287) No. 1 - Chassis ground:
Is the resistance less than 10 Ω?
Yes: The power supply and ground circuit are OK.
No: Repair or replace the harness.
NO RELATED
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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.