Wiring Diagram Cluster
1987 Pontiac Grand Prix Body Electrical Wiring Diagram
Find body control module wiring, door lock circuits, interior lighting paths, and horn/alarm schematics.
Matched Diagrams
48
Variant Used
Grand Prix V6-231 3.8L
Total Vehicle Diagrams
389
From Diagram To Fix
Use this wiring page as the jump point, not the dead end
Open the exact diagram, then move directly into the vehicle hub, the repair most likely tied to this system, or the code cluster that usually shows up with it.
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Vehicle Repair Hub
Step out of raw diagrams and into the full 1987 Pontiac Grand Prix hub with repairs, specs, codes, and other systems already tied to this car.
View vehicle repair hub →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.
1987 Pontiac Grand Prix 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 →Top Body Electrical Diagram Paths
1.Electrical Diagrams > Lighting and Horns > System Diagram > Lighter, Clock, Glove Box, Trunk & Vanity LampGeneralOpen2.Electrical Diagrams > Lighting and Horns > Trunk LampGeneralOpen3.Electrical Diagrams > Lighter, Clock, Glove Box, Trunk & Vanity LampLighting and HornsOpen4.Horn — Diagnostic AidsLighting and HornsOpen5.Horn — Diagram Information and InstructionsLighting and HornsOpen6.Horn — Electrical DiagramsLighting and HornsOpen7.Components > Miscellaneous Components > Horn Brush/Slip RingGeneralOpen8.Components > Miscellaneous Components > Power Door Locks Feed & Circuit BreakerGeneralOpen9.Components > Motors > Door Lock MotorsGeneralOpen10.Components > Relays > Door Lock Relay AssemblyGeneralOpen11.Components > Relays > Horn RelayGeneralOpen12.Components > Solenoids > Trunk Release SolenoidGeneralOpen13.Electrical Diagrams > Lighting and Horns > Backup LampGeneralOpen14.Electrical Diagrams > Lighting and Horns > Brake LampGeneralOpen15.Electrical Diagrams > Lighting and Horns > Cornering LampGeneralOpen16.Electrical Diagrams > Lighting and Horns > Courtesy Lamp > Glove Box LampGeneralOpen17.Electrical Diagrams > Lighting and Horns > Courtesy Lamp > System Diagram > Courtesy & Dome LampsGeneralOpen18.Electrical Diagrams > Lighting and Horns > Courtesy Lamp > System Diagram > License, Opera, Rear Marker & TailGeneralOpen19.Electrical Diagrams > Lighting and Horns > Dome LampGeneralOpen20.Electrical Diagrams > Lighting and Horns > Hazard Warning Lamps > Front Marker, Hazard, Park & TurnGeneralOpen21.Electrical Diagrams > Lighting and Horns > Hazard Warning Lamps > Hazard, Stop & TurnGeneralOpen22.Electrical Diagrams > Lighting and Horns > Headlamp > Headlamp Switch > Part 1 of 2GeneralOpen23.Electrical Diagrams > Lighting and Horns > Headlamp > Headlamp Switch > Part 2 of 2GeneralOpen24.Electrical Diagrams > Lighting and Horns > Headlamp > System DiagramGeneralOpen25.Electrical Diagrams > Lighting and Horns > HornGeneralOpen26.Electrical Diagrams > Lighting and Horns > License Plate LampGeneralOpen27.Electrical Diagrams > Lighting and Horns > Marker Lamp > Front Marker & Park, Hazard, Stop & Turn LampsGeneralOpen28.Electrical Diagrams > Lighting and Horns > Marker Lamp > License, Opera, Rear Marker & TailGeneralOpen29.Electrical Diagrams > Lighting and Horns > Parking LampGeneralOpen30.Electrical Diagrams > Lighting and Horns > System Diagram > Courtesy & Dome LampGeneralOpen31.Electrical Diagrams > Lighting and Horns > Tail LampGeneralOpen32.Electrical Diagrams > Lighting and Horns > Turn Signals > FT Marker, Hazard, Park & Turn LampsGeneralOpen33.Electrical Diagrams > Lighting and Horns > Turn Signals > Stop, Turn & HazardGeneralOpen34.Electrical Diagrams > Lighting and Horns > Vanity LampGeneralOpen35.Backup Lamp — Diagnostic AidsLighting and HornsOpen36.Backup Lamp — Diagram Information and InstructionsLighting and HornsOpen37.Backup Lamp — Electrical DiagramsLighting and HornsOpen38.Courtesy Lamp — Diagnostic AidsLighting and HornsOpen39.Courtesy Lamp — Diagram Information and InstructionsLighting and HornsOpen40.Courtesy Lamp — Electrical Diagrams > Courtesy & Dome LampsLighting and HornsOpen41.Courtesy Lamp — Electrical Diagrams > License, Opera, Rear Marker & TailLighting and HornsOpen42.Diagnostic AidsLighting and HornsOpen43.Diagram Information and InstructionsLighting and HornsOpen44.Electrical Diagrams > Courtesy & Dome LampLighting and HornsOpen45.Hazard Warning Lamps — Diagnostic AidsLighting and HornsOpen46.Hazard Warning Lamps — Diagram Information and InstructionsLighting and HornsOpen47.Hazard Warning Lamps — Electrical Diagrams > Front Marker, Hazard, Park & TurnLighting and HornsOpen48.Hazard Warning Lamps — Electrical Diagrams > Hazard, Stop & TurnLighting and HornsOpen
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