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.
1991 Oldsmobile Toronado V6-3800 3.8LFACTORY OEM SERVICE PROCEDURE
Part 3 of 3
BCM Schematic (3 Of 3):
1C7 = Blower Speed Control
3D5 = Data Line (UART)
3D6 = Data Line (UART)
3C4 = Ignition 1
3C10 = Fuel Level Input
2B8 = Refrigerator Pressure Switch
3D15 = Key In Ignition Switch
2B9 = Seat Belt Switch
1C5 = Chime 1 Output
1D3 = Chime 2 Output
3C12 = Brake Fluid Switch
1D2 = Wake-up Output
1C15 = Wake-up Input
1C14 = Crank Input
C12 = Speed Signal Input
3C13 = Park Brake Switch
2B6 = Turn Signal Input
2B4 = Driver Door Ajar
3D14 = Passenger Door Ajar
1C16 = Door Jamb Switch
1C13 = Door Handle Switch
Factory Service Tools
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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.
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