Wiring Diagram Cluster
1987 Pontiac Grand AM 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 AM L4-121 2.0L
Total Vehicle Diagrams
443
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.
Keep context
Vehicle Repair Hub
Step out of raw diagrams and into the full 1987 Pontiac Grand AM 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 AM 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.Courtesy Lamp — Electrical Diagrams > Courtesy, Dome, Reading, Trunk & Vanity L/Fog LampsLighting and HornsOpen2.Courtesy Lamp — Electrical Diagrams > Courtesy, Dome, Reading, Trunk & Vanity W/Fog LampsLighting and HornsOpen3.Courtesy Lamp — Electrical Diagrams > Lighter, Door Courtesy, Trunk & WarningLighting and HornsOpen4.Horn — Diagram Information and InstructionsLighting and HornsOpen5.Horn — Electrical DiagramsLighting and HornsOpen6.Components > Miscellaneous Components > Horn Brush/Slip RingGeneralOpen7.Components > Motors > Door Lock MotorsGeneralOpen8.Components > Relays > Door Lock Relay AssemblyGeneralOpen9.Components > Relays > Horn RelayGeneralOpen10.Components > Solenoids > Trunk Release SolenoidGeneralOpen11.Components > Switches > Horn SwitchGeneralOpen12.Components > Switches > Trunk Ajar SwitchGeneralOpen13.Electrical Diagrams > Courtesy Lamp > System Diagram > Courtesy, Dome, Reading, Trunk & Vanity L/Fog LampsGeneralOpen14.Electrical Diagrams > Courtesy Lamp > System Diagram > Courtesy, Dome, Reading, Trunk & Vanity W/Fog LampsGeneralOpen15.Electrical Diagrams > Courtesy Lamp > System Diagram > Lighter, Door Courtesy, Trunk & WarningGeneralOpen16.Electrical Diagrams > Dome Lamp > Courtesy, Dome, Reading, Trunk & Vanity L/Fog LampsGeneralOpen17.Electrical Diagrams > Dome Lamp > Courtesy, Dome, Reading, Trunk & Vanity W/Fog LampsGeneralOpen18.Electrical Diagrams > HornGeneralOpen19.Electrical Diagrams > Starting and Charging > Power and Ground Distribution > Fuse > Ctsy Horn Fuse & Tail LPS FuseGeneralOpen20.Electrical Diagrams > Trunk / Liftgate SolenoidGeneralOpen21.Electrical Diagrams > Trunk Lamp > Courtesy, Dome, Reading, Trunk & Vanity Lamp > With Fog LampsGeneralOpen22.Electrical Diagrams > Trunk Lamp > Courtesy, Dome, Reading, Trunk & Vanity Lamp > Without Fog LampsGeneralOpen23.Electrical Diagrams > Trunk Lamp > Lighter, Door Courtesy, Trunk & Warning LampGeneralOpen24.Backup Lamp — Diagram Information and InstructionsLighting and HornsOpen25.Backup Lamp — Electrical DiagramsLighting and HornsOpen26.Brake Lamp — Diagram Information and InstructionsLighting and HornsOpen27.Brake Lamp — Electrical DiagramsLighting and HornsOpen28.Courtesy Lamp — Diagram Information and InstructionsLighting and HornsOpen29.Courtesy Lamp — Electrical Diagrams > Glove Box & Footwell CourtesyLighting and HornsOpen30.Hazard Warning Lamps — Diagram Information and InstructionsLighting and HornsOpen31.Hazard Warning Lamps — Electrical Diagrams > FT Hzd, Marker, Turn & Hi Stop W/MonitorLighting and HornsOpen32.Hazard Warning Lamps — Electrical Diagrams > Hazard, Marker, Park, Stop & TurnLighting and HornsOpen33.Hazard Warning Lamps — Electrical Diagrams > Hazard, Rear Turn & Stop W/Lamp Monitor > Grand AM and Grand AM LeLighting and HornsOpen34.Hazard Warning Lamps — Electrical Diagrams > Hazard, Rear Turn & Stop W/Lamp Monitor > Grand AM SELighting and HornsOpen35.Hazard Warning Lamps — Electrical Diagrams > Park, Tail, License & Marker W/Monitor > Grand AM and Grand AM LeLighting and HornsOpen36.Hazard Warning Lamps — Electrical Diagrams > Park, Tail, License & Marker W/Monitor > Grand AM SELighting and HornsOpen37.Headlamp — Diagram Information and InstructionsLighting and HornsOpen38.Headlamp — Electrical Diagrams > With Composite HeadlampsLighting and HornsOpen39.Headlamp — Electrical Diagrams > With Composite Headlamps & Fog LampsLighting and HornsOpen40.Headlamp — Electrical Diagrams > With Composite Headlamps & Lamp Monitor, Less Fog LampsLighting and HornsOpen41.Headlamp — Electrical Diagrams > With Composite Headlamps, Fog Lamps & Lamp MonitorLighting and HornsOpen42.Headlamp — Electrical Diagrams > With Dual Beam HeadlampsLighting and HornsOpen43.Headlamp — Electrical Diagrams > With Dual Beam Headlamps & Fog LampsLighting and HornsOpen44.Headlamp — Electrical Diagrams > With Dual Beam Headlamps & Lamp Monitor, Less Fog LampsLighting and HornsOpen45.Headlamp — Electrical Diagrams > With Dual Beam Headlamps, Fog Lamps & Lamp MonitorLighting and HornsOpen46.Locks > Power Locks — Diagram Information and InstructionsBody and FrameOpen47.Locks > Power Locks — Electrical DiagramsBody and FrameOpen48.Seats — Diagram Information and InstructionsBody and FrameOpen
Exact Vehicle Hub
Browse →OEM Manual Evidence
Browse →Likely Trouble Codes for This System
Browse →More Grand AM Wiring Pages
Starter Wiring DiagramAlternator Wiring DiagramHeadlight 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
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