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.
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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 31 (WIRING SYSTEMS AND POWER MANAGEMENT)
2008 Pontiac Grand Prix Base
Section 31 (Wiring Systems And Power Management)
2008 Pontiac Grand Prix BaseSECTION Section 31 (Wiring Systems And Power Management)
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Master Electrical Component List
- Power and Grounding Component Views
- Power and Grounding Connector End Views
- Electrical Center Identification Views
- Fuse Block - Underhood Label
- Fuse Block - Underhood Top View
- Fuse Block - Underhood Bottom View
- Fuse Block - Underhood C1
- Fuse Block - Underhood C2
- Fuse Block - Underhood C3
- Fuse Block - Underhood C4
- Fuse Block - Underhood C5
- Fuse Block - Underhood C6
- Fuse Block - Underhood C7
- Fuse Block - Underhood C9
- Fuse Block - I/P Label Usage
- Fuse Block - I/P Top View
- Fuse Block - I/P Bottom View
- Fuse Block - I/P C1
- Fuse Block - I/P C2
- Fuse Block - I/P C3
- Fuse Block - I/P C4
- Relay Block - I/P Label
- Relay Block - I/P Top View
- Relay Block - I/P Bottom View
- Relay Block - I/P C1
- Relay Block - I/P C3
- Relay Block - I/P C4
- Relay Block - I/P C7 (Trailer Wiring)
- Relay Block - I/P C7 (USB/USC/UNR)
- Relay Block - I/P C10
- Junction Block - I/P Top View
- Junction Block - I/P Bottom View
- Junction Block - Wire Entry
- Junction Block - I/P C2
- Junction Block - I/P C4
- Junction Block - I/P C5
- Junction Block - I/P C6
- Junction Block - I/P C7
- Junction Block - I/P C8
- Splice Pack Connector End Views
- Inline Harness Connector End Views
- C100 I/P Harness to Engine Harness
- C101 I/P Harness to Chassis Harness
- C102 Chassis Harness to I/P Harness
- C103 I/P Harness to Forward Lamp Harness
- C104 I/P Harness to Chassis Harness
- C105 I/P Harness to Chassis Harness (Except UNR)
- C105 I/P Harness to Grille Brushguard Lamp Harness (UNR)
- C106 Chassis Harness to Engine Harness
- C107 Dash Jumper Harness to Rear Vision Harness (UVC)
- C108 SE Power Harness to Dash Jumper Harness (WS2)
- C115 Engine Harness to Knock Sensor Jumper Harness
- C148 Engine Harness to Odd Ignition Coil Harness
- C158 Engine Harness to Even Ignition Coil Harness
- C200 Body Harness to I/P Harness
- C201 Steering Column Harness to I/P Harness (w/o WS2)
- C201 I/P Overlay Harness to I/P Harness (WS2)
- C202 I/P Harness to Body Harness
- C203 Steering Column Harness to I/P Harness
- C204 Mirror Jumper Harness to Dash Jumper Harness (UVC)
- C205 Dash Jumper Harness to I/P Overlay Harness (WS2)
- C206 Steering Column Harness to I/P Overlay Harness (WS2)
- C210 Headliner Harness to I/P Harness
- C211 Body Crossrail Roof Lamp Harness to Body Relay Harness (USB/USC/USD)
- C212 Body Crossrail Roof Lamp Harness to Body Relay Harness (USB/USC)
- C212 Roof Lamp Jumper Harness to Roof Lamp Body Harness (USD)
- C277 Steering Column Harness to Steering Wheel Harness
- C298 Body Harness to I/P Harness
- C300 Body Harness to Midgate Harness (SUT)
- C310 Body Harness to Left Rear Door Harness
- C311 Body Cross Rail Harness to Cross Rail Harness (USB/USC)
- C311 Roof Lamp Jumper Harness to Light Bar Harness (USD)
- C320 Body Harness to Left Rear Seat Harness
- C325 Body Harness to Driver Seat Harness
- C326 Seat Jumper Harness to Seat Harness
- C327 Seat Jumper Harness to Seat Harness
- C328 Seat Motor Jumper Harness to Seat Jumper Harness
- C329 Seat Motor Jumper Harness to Seat Jumper Harness
- C330 Heated Seat Jumper Harness to Seat Jumper Harness
- C333 Lumbar/Bolster Harness to Seat Harness
- C350 I/P Harness to Console Harness
- C355 Body Harness to Console Harness
- C362 Control Box Harness to FM Modulator Harness
- C375 Body Harness to Passenger Seat Harness
- C376 Seat Motor Jumper Harness to Passenger Seat Harness
- C377 Heated Seat Jumper Harness to Passenger Seat Harness
- C378 Lumbar/Bolster Harness to Passenger Seat Harness
- C380 Body Harness to Right Rear Seat Harness
- C390 Body Harness to Right Rear Door Harness
- C400 Cargo Bed Harness to Chassis Harness (SUT)
- C401 Spare Tire Jumper Harness to Chassis Harness
- C402 Cargo Bed Harness to Chassis Harness (SUT)
- C420 Body Harness to Liftgate Jumper Harness (Except SUT)
- C450 Chassis Harness to Air Suspension Harness (ZM6)
- C451 Chassis Harness to Air Suspension Harness (ZM6)
- C900 Liftgate Harness to Liftgate Jumper Harness (Except SUT)
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Wiring Systems and Power Management
- Scan Tool Data Definitions
- Scan Tool Data List
- DTC B1440
- Symptoms - Wiring Systems
- Ignition Can/Cannot Be Turned Off with Transmission in Any Gear
- Power Mode Mismatch
- Retained Accessory Power (RAP) Inoperative
- Retained Accessory Power (RAP) On After Timeout
- Utility/Van Zoning
- Electrical Symbols
- General Electrical Diagnosis
- Checking Aftermarket Accessories
- Circuit Testing
- Using Connector Test Adapters
- Probing Electrical Connectors
- Troubleshooting with a Digital Multimeter
- Troubleshooting with a Test Lamp
- Using Fused Jumper Wires
- Measuring Voltage
- Measuring Voltage Drop
- Measuring Frequency
- Testing for Continuity
- Testing for Short to Ground
- Testing for a Short to Voltage
- Testing for Intermittent Conditions and Poor Connections
- Inducing Intermittent Fault Conditions
- Testing for Electrical Intermittents
- Scan Tool Snapshot Procedure
- Circuit Protection - Fuses
- Circuit Protection - Circuit Breakers
- Circuit Protection - Fusible Links
- Wiring Repairs
- Repairing Damaged Wire Insulation
- Flat Wire Repairs
- GMLAN Wiring Repairs
- High Temperature Wiring Repairs
- Heated Oxygen Sensor Wiring Repairs
- Splicing Copper Wire Using Splice Clips
- Splicing Copper Wire Using Splice Sleeves
- Splicing Twisted or Shielded Cable
- Splicing Inline Harness Diodes
- SIR/SRS Wiring Repairs
- Connector Repairs
- Connector Position Assurance Locks
- Terminal Position Assurance Locks
- AFL/EPC Connectors
- Bosch Connectors (0.64)
- Bosch Connectors (2.8 JPT)
- Bosch Connectors (BSK)
- Bosch Connectors (ECM)
- Delphi Connectors (Micro .64)
- Delphi Connectors (Micro-Pack 100W)
- Delphi Connectors (Pull To Seat)
- Delphi Connectors (Push To Seat)
- Delphi Connectors (Weather Pack)
- Delphi Connectors (12-Way)
- FCI Connectors
- JST Connectors
- Kostal Connectors
- Molex Connectors
- Sumitomo Connectors
- Tyco/AMP Connectors (025 Cap)
- Tyco/AMP Connectors (CM 42-Way)
- Tyco/AMP Connectors (Sensor)
- Tyco/AMP Connectors (43-Way)
- Tyco/AMP Connectors (Door Module)
- Yazaki Connectors (2-Way)
- Yazaki Connectors (16-Way)
- Repairing Connector Terminals
- Ignition Key Cannot Be Removed from the Ignition Lock Cylinder
- Ignition Key Cannot Turn or Sticks in Any Position
- Repair Instructions
- Relay Replacement (Attached to Wire Harness)
- Relay Replacement (Within an Electrical Center)
- Underhood Electrical Center or Junction Block Replacement
- Instrument Panel Electrical Center or Junction Block Replacement - Left Side
- Instrument Panel Electrical Center or Junction Block Replacement - Right Side
- Ignition Lock Cylinder Case Replacement
- Ignition Lock Cylinder Replacement
- Ignition and Start Switch Replacement
- Description and Operation
- Special Tools and Equipment
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.