Wiring Diagram Cluster

1991 Buick Roadmaster Body Electrical Wiring Diagram

Find body control module wiring, door lock circuits, interior lighting paths, and horn/alarm schematics.

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Matched Diagrams

48

Variant Used

Roadmaster Estate Wagon V8-305 5.0L

Total Vehicle Diagrams

664

From Diagram To Fix

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1991 Buick Roadmaster A L L Diagnostic Trouble Codes ( DTC )

OEM source

Factory Manual Evidence

When there is no clean repair shortcut for this system, drop into the OEM manual sections that usually carry the authoritative test path.

1991 Buick Roadmaster A L L Diagnostic Trouble Codes ( DTC ) →
1991 Buick Roadmaster A L L Diagnostic Trouble Codes ( DTC )1991 Buick Roadmaster A L L Diagnostic Trouble Codes ( DTC )1991 Buick Roadmaster A L L Diagnostic Trouble Codes ( DTC )

Diagnostic signal

Codes Often Seen With This System

Use the code cluster when wiring faults overlap with check-engine or module-level diagnostics.

B1318: Battery Voltage Low →
U0140: Lost Communication with Body Control Module

Top Body Electrical Diagram Paths

1.Electrical Diagrams > Windows > Rear Glass Release & Tailgate Lock > With Power Door Locks (Less Keyless Entry)GeneralOpen2.Windows — Electrical Diagrams > Rear Glass Release & Tailgate Lock > With Power Door Locks (Less Keyless Entry)Windows and GlassOpen3.Doors, Hood and Trunk > Trunk / Liftgate — Electrical Diagrams > With Keyless EntryBody and FrameOpen4.Doors, Hood and Trunk > Trunk / Liftgate — Electrical Diagrams > With Power Door LocksBody and FrameOpen5.Doors, Hood and Trunk > Trunk / Liftgate — Electrical Diagrams > Without Power Door LocksBody and FrameOpen6.Electrical Diagrams > Trunk / Liftgate > With Keyless EntryGeneralOpen7.Electrical Diagrams > Trunk / Liftgate > With Power Door LocksGeneralOpen8.Electrical Diagrams > Trunk / Liftgate > Without Power Door LocksGeneralOpen9.Electrical Diagrams > Windows > Rear Glass Release & Tailgate Lock > Less Power Door LocksGeneralOpen10.Electrical Diagrams > Windows > Rear Glass Release & Tailgate Lock > With Keyless EntryGeneralOpen11.Windows — Electrical Diagrams > Rear Glass Release & Tailgate Lock > Less Power Door LocksWindows and GlassOpen12.Windows — Electrical Diagrams > Rear Glass Release & Tailgate Lock > With Keyless EntryWindows and GlassOpen13.Doors, Hood and Trunk > Trunk / Liftgate — Diagnostic Aids > Pull-to-Seat ConnectorsBody and FrameOpen14.Doors, Hood and Trunk > Trunk / Liftgate — Diagnostic Aids > Push-to-Seat ConnectorsBody and FrameOpen15.Doors, Hood and Trunk > Trunk / Liftgate — Diagram Information and Instructions > Cell ReferencesBody and FrameOpen16.Doors, Hood and Trunk > Trunk / Liftgate — Diagram Information and Instructions > Schematic SymbolsBody and FrameOpen17.Doors, Hood and Trunk > Trunk / Liftgate — Diagram Information and Instructions > Wire Color Code IdentificationBody and FrameOpen18.Horn — Diagnostic Aids > Pull-to-Seat ConnectorsLighting and HornsOpen19.Horn — Diagnostic Aids > Push-to-Seat ConnectorsLighting and HornsOpen20.Horn — Diagram Information and Instructions > Cell ReferencesLighting and HornsOpen21.Horn — Diagram Information and Instructions > Schematic SymbolsLighting and HornsOpen22.Horn — Diagram Information and Instructions > Wire Color Code IdentificationLighting and HornsOpen23.Horn — Electrical DiagramsLighting and HornsOpen24.Locks > Power Locks — Electrical Diagrams > With Keyless EntryBody and FrameOpen25.Locks > Power Locks — Electrical Diagrams > Without Keyless EntryBody and FrameOpen26.Components > Miscellaneous Components > Horn Brush/Slip RingGeneralOpen27.Components > Miscellaneous Components > Trunk Lid Pull Down UnitGeneralOpen28.Components > Modules > Keyless Entry ModuleGeneralOpen29.Components > Motors > LH Front Door Lock MotorGeneralOpen30.Components > Motors > LH Rear Door Lock MotorGeneralOpen31.Components > Motors > RH Rear Door Lock MotorGeneralOpen32.Components > Motors > Tailgate Lock MotorGeneralOpen33.Components > Relays > Horn RelayGeneralOpen34.Components > Relays > Power Door Lock RelayGeneralOpen35.Components > Relays > Tailgate Lock RelayGeneralOpen36.Components > Solenoids > Trunk Lid Release SolenoidGeneralOpen37.Components > Switches > Door Lock SwitchGeneralOpen38.Components > Switches > Rear Glass Release/Tailgate Lock SwitchGeneralOpen39.Components > Switches > Tailgate Ajar SwitchGeneralOpen40.Components > Switches > Tailgate Lock Sense SwitchGeneralOpen41.Components > Switches > Trunk Lid Latch SwitchGeneralOpen42.Components > Switches > Trunk Lid Release SwitchGeneralOpen43.Components > Switches > Trunk Security SwitchGeneralOpen44.Connector Views > Keyless Entry Programming Connector > SedanGeneralOpen45.Connector Views > Keyless Entry Programming Connector > WagonGeneralOpen46.Electrical Diagrams > Lighting and Horns > Backup LampGeneralOpen47.Electrical Diagrams > Lighting and Horns > Brake LampGeneralOpen48.Electrical Diagrams > Lighting and Horns > Center Mounted Brake LampGeneralOpen

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1991 Buick Roadmaster Repair HubExact Vehicle

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OEM Manual Evidence

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1991 Buick Roadmaster A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 1991 Buick Roadmaster V8-305 5.0L Service Manual | Operation CHARM Operation CHARM : Car repair ma...

1991 Buick Roadmaster A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 1991 Buick Roadmaster Estate Wagon V8-305 5.0L Service Manual | Operation CHARM Operation CHARM :...

1991 Buick Roadmaster A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 1991 Buick Riviera V6-231 3.8L VIN L SFI Service Manual | Operation CHARM Operation CHARM : Car re...

1991 Buick Roadmaster A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 1991 Buick Skylark L4-151 2.5L Service Manual | Operation CHARM Operation CHARM : Car repair manua...

Likely Trouble Codes for This System

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B1318: Battery Voltage LowCode

Body/Electrical code commonly seen during body electrical diagnosis.

U0140: Lost Communication with Body Control ModuleCode

Network/Communication code commonly seen during body electrical diagnosis.

More Roadmaster Wiring Pages

Starter Wiring DiagramAlternator Wiring DiagramHeadlight Wiring DiagramABS Brake Wiring DiagramA/C & Heater Wiring DiagramPower Window Wiring DiagramInstrument Cluster Wiring DiagramWiper & Washer Wiring DiagramTransmission Wiring DiagramCruise Control Wiring DiagramAirbag SRS Wiring DiagramEngine Management Wiring Diagram

Same System, Other Vehicles

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