Wiring Diagram Cluster
1991 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 L4-138 2.3L DOHC QUAD 4
Total Vehicle Diagrams
627
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 1991 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.
1991 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 > Interior Lights > Except STE > Part 1 of 3GeneralOpen2.Electrical Diagrams > Lighting and Horns > System Diagram > Interior Lights > Except STE > Part 2 of 3GeneralOpen3.Electrical Diagrams > Lighting and Horns > System Diagram > Interior Lights > Except STE > Part 3 of 3GeneralOpen4.Electrical Diagrams > Lighting and Horns > System Diagram > Interior Lights > STE > Part 1 of 3GeneralOpen5.Electrical Diagrams > Lighting and Horns > System Diagram > Interior Lights > STE > Part 2 of 3GeneralOpen6.Electrical Diagrams > Lighting and Horns > System Diagram > Interior Lights > STE > Part 3 of 3GeneralOpen7.Electrical Diagrams > Interior Lights > Except STE > Part 1 of 3Lighting and HornsOpen8.Electrical Diagrams > Interior Lights > Except STE > Part 2 of 3Lighting and HornsOpen9.Electrical Diagrams > Interior Lights > Except STE > Part 3 of 3Lighting and HornsOpen10.Electrical Diagrams > Interior Lights > STE > Part 1 of 3Lighting and HornsOpen11.Electrical Diagrams > Interior Lights > STE > Part 2 of 3Lighting and HornsOpen12.Electrical Diagrams > Interior Lights > STE > Part 3 of 3Lighting and HornsOpen13.Horn — Diagnostic Aids > Pull-to-Seat ConnectorsLighting and HornsOpen14.Horn — Diagnostic Aids > Push-to-Seat ConnectorsLighting and HornsOpen15.Horn — Diagram Information and Instructions > Cell ReferencesLighting and HornsOpen16.Horn — Diagram Information and Instructions > Schematic SymbolsLighting and HornsOpen17.Horn — Diagram Information and Instructions > Wire Color Code IdentificationLighting and HornsOpen18.Horn — Electrical DiagramsLighting and HornsOpen19.Locks > Keyless Entry — Diagnostic Aids > Pull-to-Seat ConnectorsBody and FrameOpen20.Locks > Keyless Entry — Diagnostic Aids > Push-to-Seat ConnectorsBody and FrameOpen21.Locks > Keyless Entry — Diagram Information and Instructions > Cell ReferencesBody and FrameOpen22.Locks > Keyless Entry — Diagram Information and Instructions > Schematic SymbolsBody and FrameOpen23.Locks > Keyless Entry — Diagram Information and Instructions > Wire Color Code IdentificationBody and FrameOpen24.Locks > Keyless Entry — Electrical Diagrams > Four DoorBody and FrameOpen25.Locks > Keyless Entry — Electrical Diagrams > Two DoorBody and FrameOpen26.Antitheft and Alarm Systems > Keyless Entry — Diagnostic Aids > Pull-to-Seat ConnectorsAccessories and Optional EquipmentOpen27.Antitheft and Alarm Systems > Keyless Entry — Diagnostic Aids > Push-to-Seat ConnectorsAccessories and Optional EquipmentOpen28.Antitheft and Alarm Systems > Keyless Entry — Diagram Information and Instructions > Cell ReferencesAccessories and Optional EquipmentOpen29.Antitheft and Alarm Systems > Keyless Entry — Diagram Information and Instructions > Schematic SymbolsAccessories and Optional EquipmentOpen30.Antitheft and Alarm Systems > Keyless Entry — Diagram Information and Instructions > Wire Color Code IdentificationAccessories and Optional EquipmentOpen31.Antitheft and Alarm Systems > Keyless Entry — Electrical Diagrams > Four DoorAccessories and Optional EquipmentOpen32.Antitheft and Alarm Systems > Keyless Entry — Electrical Diagrams > Two DoorAccessories and Optional EquipmentOpen33.Components > Miscellaneous Components > HornGeneralOpen34.Components > Miscellaneous Components > Horn Brush/Slip RingGeneralOpen35.Components > Miscellaneous Components > Trunk LightGeneralOpen36.Components > Motors > Door Lock MotorGeneralOpen37.Components > Relays > Power Door Lock RelayGeneralOpen38.Components > Switches > Door Lock Switch, FrontGeneralOpen39.Components > Switches > Horn SwitchGeneralOpen40.Electrical Diagrams > Keyless Entry > Four DoorGeneralOpen41.Electrical Diagrams > Keyless Entry > Two DoorGeneralOpen42.Electrical Diagrams > Lighting and Horns > Backup Lamp > Except STEGeneralOpen43.Electrical Diagrams > Lighting and Horns > Backup Lamp > STEGeneralOpen44.Electrical Diagrams > Lighting and Horns > Brake Lamp > With Lamp MonitorGeneralOpen45.Electrical Diagrams > Lighting and Horns > Brake Lamp > Without Lamp MonitorGeneralOpen46.Electrical Diagrams > Lighting and Horns > Dimmer Switch > Except STEGeneralOpen47.Electrical Diagrams > Lighting and Horns > Dimmer Switch > STEGeneralOpen48.Electrical Diagrams > Lighting and Horns > Hazard Warning Lamps > Less Lamp Monitor > Front Side Marker, Hazard & Turn > Part 1 of 2GeneralOpen
Exact Vehicle Hub
Browse →OEM Manual Evidence
Browse →Likely Trouble Codes for This System
Browse →More Grand Prix 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
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