Repair and Diagnosis

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• Quick Lookups
  • Common Specs & Procedures
  • DTC Index
  • Electrical Component Locations
    • Component Locations - Electrical Center Identification Views
    • Component Locations - Ground Views
    • Electrical Component Locator - Door Component Views
  • Fluids
  • Technical Bulletins
    • Campaigns
    • Safety Recalls
    • Technical Service Bulletins
  • Tire Fitment
  • Wiring Diagrams
    • Component Connector End Views - Index
    • Component Connector End Views (A10-B218R)
    • Component Connector End Views (B233B-K19)
    • Component Connector End Views (K20 - K89)
    • Component Connector End Views (K99-Q83B)
    • Component Connector End Views (Q84A-X85)
    • Component Connector End Views, Electrical Center Identification Views, Ground Views And Wiring Schematics - Miscellaneous
    • Inline Harness Connector End Views - Index
    • Inline Harness Connector End Views (X110-X219)
    • Inline Harness Connector End Views (X220-X408)
    • Inline Harness Connector End Views (X409-X800)
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
    • Wiring Systems And Power Management - Wiring Harness Routing And Schematic Wiring Diagrams
• Accessories & Equipment
  • Accessories Control Systems
    • Active Noise Cancellation
    • Power Outlets
  • Anti-Theft Systems
    • Immobilizer System
    • Remote Functions
    • Theft Deterrent System
    • Vehicle Access System
  • Body Interior
    • Secondary And Configurable Customer Controls
    • Vehicle Access System
  • Collision/Avoidance
    • Driver Assistance Systems
    • Image Display Cameras
    • Parking Assistance Systems
  • Communication Devices
    • Data Communications - Description And Operation
    • Data Communications - Diagnostic Information And Procedures (B1000-U1803)
    • Data Communications - Diagnostic Information And Procedures (U1814-U3012) And Symptoms
    • Data Communications - Repair Instructions
    • Data Communications - Schematic Wiring Diagrams
    • Data Communications - Special Tools And Equipment - Special Tools
    • Data Communications - Specifications - Fastener Specifications
    • Programming And Setup
  • Cruise Control Systems
  • Drivers Assistance Systems - ADAS
    • Driver Assistance Systems
    • Image Display Cameras
    • Parking Assistance Systems
  • Entertainment Systems
    • Active Noise Cancellation
    • Cellular, Entertainment, And Navigation System
  • Exterior Lights
    • Lighting - Description And Operation
    • Lighting - Diagnostic Information And Procedures
    • Lighting - Repair Instructions
    • Lighting - Schematic Wiring Diagrams
    • Lighting - Special Tools And Equipment - Special Tools
    • Lighting - Specifications
  • Gauges & Instrument Panels
    • Displays And Gauges
    • Instrument Panel And Console Trim
  • Headlights
    • Lighting - Description And Operation
    • Lighting - Diagnostic Information And Procedures
    • Lighting - Repair Instructions
    • Lighting - Schematic Wiring Diagrams
    • Lighting - Special Tools And Equipment - Special Tools
    • Lighting - Specifications
  • Heated Glass/Defoggers
    • Fixed And MOVEABLE Windows
  • Horns And Pedestrian Alerts
  • Ignition Switch/Steering Lock
    • Immobilizer System
  • Infotainment
    • Active Noise Cancellation
    • Cellular, Entertainment, And Navigation System
  • Interior/Exterior Trim
    • Bolted Exterior Body Panels And Closures
    • Exterior Trim
    • Floor Coverings And HEADLININGS
    • Instrument Panel And Console Trim
    • Interior Trim And Paneling
    • Seat Hardware, Trim, And Upholstery
  • Interior/Illumination Lights
    • Lighting - Description And Operation
    • Lighting - Diagnostic Information And Procedures
    • Lighting - Repair Instructions
    • Lighting - Schematic Wiring Diagrams
    • Lighting - Special Tools And Equipment - Special Tools
    • Lighting - Specifications
  • Mirrors
  • Seats
    • Power Seats
    • Seat Hardware, Trim, And Upholstery
    • Seat Heating And Cooling
  • Steering Column Switches
    • Secondary And Configurable Customer Controls
  • Warning Systems
    • Tire Pressure Monitoring System
  • Window Motors & Regulators
    • Fixed And MOVEABLE Windows
  • Wiper/Washer Systems
    • Wiper System And Washer System
• Body & Frame
  • Body, Cab Control Systems
    • Secondary And Configurable Customer Controls
    • Vehicle Access System
  • Door Locks
    • Immobilizer System
    • Remote Functions
    • Theft Deterrent System
    • Vehicle Access System
  • Exterior Body Panels
    • Air/Wind Noise
    • Bolted Exterior Body Panels And Closures
    • Bumpers And Fascias
    • Squeaks And Rattles
    • Water Leaks
  • Exterior/Interior Trim
    • Bolted Exterior Body Panels And Closures
    • Exterior Trim
    • Floor Coverings And HEADLININGS
    • Instrument Panel And Console Trim
    • Interior Trim And Paneling
    • Seat Hardware, Trim, And Upholstery
  • Frames, Subframes & Crossmembers
    • Frame And Underbody
  • Ignition Switch/Steering Lock
    • Immobilizer System
  • Mirrors
  • Seats
    • Power Seats
    • Seat Hardware, Trim, And Upholstery
    • Seat Heating And Cooling
  • Sun Roof/T-Top/Convertible Top
    • Sunroof
  • Fixed And MOVEABLE Windows
• Brakes
  • Anti-Lock Brakes
    • Antilock Brake System - Hybrid
  • Mechanical - Hydraulic
    • Disc Brakes
    • Hydraulic Brake System
  • Parking Brake System
  • Traction Control
    • Antilock Brake System - Hybrid
• Drivelines & Axles
  • Axle Shafts
    • Wheel Drive Shafts
  • Differentials & Drive Axles
    • Rear Drive Axle
  • Driveshaft & Universal Joints
    • Propeller Shaft
• Electrical
  • Body Electrical
    • Battery, Charging System And Starting System
    • Component Connector End Views - Index
    • Component Connector End Views (A10-B218R)
    • Component Connector End Views (B233B-K19)
    • Component Connector End Views (K20 - K89)
    • Component Connector End Views (K99-Q83B)
    • Component Connector End Views (Q84A-X85)
    • Component Connector End Views, Electrical Center Identification Views, Ground Views And Wiring Schematics - Miscellaneous
    • Component Locations - Electrical Center Identification Views
    • Component Locations - Front Of Vehicle/Engine Compartment Component Views
    • Component Locations - Ground Views
    • Component Locations - Instrument Panel/Center Console Component Views
    • Component Locations - Luggage Compartment/Rear Of Vehicle Component Views
    • Component Locations - Master Electrical Component List
    • Component Locations - Passenger Compartment/Roof Component Views
    • Component Locations - Powertrain Component Views
    • Component Locations - Wheels/Vehicle Underbody Component Views
    • Electrical Component Locator - Door Component Views
    • Inline Harness Connector End Views - Index
    • Inline Harness Connector End Views (X110-X219)
    • Inline Harness Connector End Views (X220-X408)
    • Inline Harness Connector End Views (X409-X800)
    • Wiring Systems And Power Management - Description And Operation
    • Wiring Systems And Power Management - Diagnostic Information And Procedures
    • Wiring Systems And Power Management - Fastener Specifications
    • Wiring Systems And Power Management - Repair Instructions
    • Wiring Systems And Power Management - Special Tools And Equipment
    • Wiring Systems And Power Management - Wiring Harness Routing And Schematic Wiring Diagrams
  • Charging Systems
    • Battery, Charging System And Starting System
  • Component Locations
    • Component Locations - Electrical Center Identification Views
    • Component Locations - Ground Views
    • Electrical Component Locator - Door Component Views
  • Fuses & Circuit Breakers
    • Component Locations - Electrical Center Identification Views
  • Gauges
    • Displays And Gauges
    • Instrument Panel And Console Trim
  • Horns And Pedestrian Alerts
  • Motors, Switches, Relays
    • Battery, Charging System And Starting System
    • Component Connector End Views - Index
    • Component Connector End Views (A10-B218R)
    • Component Connector End Views (B233B-K19)
    • Component Connector End Views (K20 - K89)
    • Component Connector End Views (K99-Q83B)
    • Component Connector End Views (Q84A-X85)
    • Component Connector End Views, Electrical Center Identification Views, Ground Views And Wiring Schematics - Miscellaneous
    • Component Locations - Electrical Center Identification Views
    • Component Locations - Front Of Vehicle/Engine Compartment Component Views
    • Component Locations - Ground Views
    • Component Locations - Instrument Panel/Center Console Component Views
    • Component Locations - Luggage Compartment/Rear Of Vehicle Component Views
    • Component Locations - Master Electrical Component List
    • Component Locations - Passenger Compartment/Roof Component Views
    • Component Locations - Powertrain Component Views
    • Component Locations - Wheels/Vehicle Underbody Component Views
    • Electrical Component Locator - Door Component Views
    • Inline Harness Connector End Views - Index
    • Inline Harness Connector End Views (X110-X219)
    • Inline Harness Connector End Views (X220-X408)
    • Inline Harness Connector End Views (X409-X800)
    • Wiring Systems And Power Management - Description And Operation
    • Wiring Systems And Power Management - Diagnostic Information And Procedures
    • Wiring Systems And Power Management - Fastener Specifications
    • Wiring Systems And Power Management - Repair Instructions
    • Wiring Systems And Power Management - Special Tools And Equipment
    • Wiring Systems And Power Management - Wiring Harness Routing And Schematic Wiring Diagrams
  • Starter
    • Battery, Charging System And Starting System
  • Wiring Diagrams
    • Component Connector End Views - Index
    • Component Connector End Views (A10-B218R)
    • Component Connector End Views (B233B-K19)
    • Component Connector End Views (K20 - K89)
    • Component Connector End Views (K99-Q83B)
    • Component Connector End Views (Q84A-X85)
    • Component Connector End Views, Electrical Center Identification Views, Ground Views And Wiring Schematics - Miscellaneous
    • Inline Harness Connector End Views - Index
    • Inline Harness Connector End Views (X110-X219)
    • Inline Harness Connector End Views (X220-X408)
    • Inline Harness Connector End Views (X409-X800)
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
    • Wiring Systems And Power Management - Wiring Harness Routing And Schematic Wiring Diagrams
• Engine Mechanical
  • Cooling System (Mechanical)
    • Engine Heating And Cooling
  • Exhaust System
  • Lubrication System
    • Maintenance And Lubrication
  • Engine Mechanical - 2.5L (LHN)
  • Starter
    • Battery, Charging System And Starting System
• Engine Performance
  • Emissions
    • Emission Applications
    • Emission Control Abbreviations
    • State Emission Standards - Diesel
    • State Emission Standards - Gas
  • Remove, Overhaul & Install
    • Engine Controls And Fuel - 2.5L (LHN) - Repair Instructions
  • Specifications
    • Firing Order & Cylinder Identification
  • System
    • Data Communications - Diagnostic Information And Procedures (B1000-U1803)
    • Engine Controls And Fuel - 2.5L (LHN) - Description And Operation
    • Engine Controls And Fuel - 2.5L (LHN) - Diagnostic Information And Procedures (P0010-P034B)
    • Engine Controls And Fuel - 2.5L (LHN) - Diagnostic Information And Procedures (P0351-P31BF) And Symptoms
    • Engine Controls And Fuel - 2.5L (LHN) - Schematic Wiring Diagrams
    • Engine Controls And Fuel - 2.5L (LHN) - Special Tools And Equipment
    • Engine Controls And Fuel - 2.5L (LHN) - Specifications
  • Testing & Diagnosis
    • Data Communications - Diagnostic Information And Procedures (B1000-U1803)
    • Engine Controls And Fuel - 2.5L (LHN) - Description And Operation
    • Engine Controls And Fuel - 2.5L (LHN) - Diagnostic Information And Procedures (P0010-P034B)
    • Engine Controls And Fuel - 2.5L (LHN) - Diagnostic Information And Procedures (P0351-P31BF) And Symptoms
    • Engine Controls And Fuel - 2.5L (LHN) - Schematic Wiring Diagrams
    • Engine Controls And Fuel - 2.5L (LHN) - Special Tools And Equipment
    • Engine Controls And Fuel - 2.5L (LHN) - Specifications
• General Information
  • Abbreviations
    • Commonly Used Abbreviations - General Information
    • Emission Control Abbreviations
  • Basic Trouble Shooting
    • Basic Trouble Shooting - General Information
    • Commonly Used Abbreviations - General Information
    • Emission Control Abbreviations
    • Engine Performance - Trouble Shooting - General Information
  • Brakes
    • Anti-Lock Brake Safety Precautions - General Information
    • Map - Brake Systems
    • Map - Routine Inspection Reference Guide
  • Check Lists
    • Symptom Check List Worksheet - General Information
  • Driveline/Axles
    • Drive Axle Noise Diagnosis - General Information
    • Gear Tooth Contact Patterns - General Information
    • Map - Drive Train & Transmission
    • Trouble Shooting - Clutches - General Information
  • DTC Index
  • Electrical
    • Map - Electrical Systems
    • Using lemon2025'S System Wiring Diagrams
  • Engine
    • Engine Overhaul Procedures - General Information
    • General Cooling System Service - General Information
  • Engine Performance
    • Electrostatic Discharge Warning - General Information
    • Engine Performance Diagnostic Routine Outline - General Information
    • Engine Performance Safety Precautions
    • Map - Engine Performance & Maintenance
    • Parasitic Load Explanation & Test Procedures - General Information
    • State Emission Standards - Diesel
    • State Emission Standards - Gas
    • Waveforms - Injector Pattern Tutorial - General Information
  • Map - Exhaust Systems
  • Heating, Ventilation & A/C (HVAC)
    • Map - Heating, Ventilation, & Air Conditioning
  • Hoist/Jack
    • General Information
  • Identification
    • CANADIAN Model Cross-Reference
    • General Information
  • Metric Conversions
    • Engine Displacement Conversion Table - ECAT
    • Metric Conversions
  • OEM General Information
    • Automatic Stop/Start Disable
    • Dangers, Warnings, And Cautions
    • General Information
    • Special Tools
    • Vehicle Diagnostic Information - Diagnostic Information And Procedures
    • Vehicle Diagnostic Information - Specifications (1 Of 2)
    • Vehicle Diagnostic Information - Specifications (2 Of 2)
    • Vibration Diagnosis And Correction
  • Reset Procedures
    • Maintenance Reminder Light (Reset Procedures)
    • Programming And Setup
    • Tire Pressure Monitor Systems
  • RPO Codes
    • General Information
  • Specifications Index
    • Common Specs & Procedures
  • Steering
    • Map - Steering, Suspension, Wheel Alignment, Wheels & Tires
    • Wheel Alignment Theory & Operation - General Information
  • Traction Control Disable Procedures
  • Trouble Shooting - Manual Transmission - General Information
• Heating, Ventilation & A/C (HVAC)
  • HVAC Control Systems
    • Heating, Ventilation, And Air Conditioning
    • HVAC - Automatic
• Hybrid/Electric Powertrain
  • Battery Management Systems
    • Hybrid/EV Energy Storage System
  • Cooling Systems
    • Hybrid/EV Cooling
  • Electric Converters and Controllers
    • Hybrid/EV Controls
• Maintenance
  • Procedures
    • Maintenance And Lubrication
• Restraints
  • Air Bag, SRS
    • Supplemental Inflatable Restraint System
  • Restraints Control Systems
    • Seat Belts
  • Seat Belts
• Steering
  • Manual Steering
    • Power Steering
  • Power Steering
  • Steering Column
    • Steering Wheel And Column
  • Steering Control Systems
    • Steering Wheel And Column
• Suspension
  • Electronic Suspension Control
  • Front Suspension
    • Front Suspension
    • Suspension General Diagnosis
  • Rear Suspension
    • Rear Suspension
    • Suspension General Diagnosis
  • Wheel Alignment
    • BUICK Wheel Alignment Specifications - Lacrosse
    • Wheel Alignment
  • Wheels & Tire System
    • Tire Pressure Monitoring System
    • Tires And Wheels
• Transmission
  • Automatic Trans
    • Automatic Transmission - 6T40 (MNH) - Component Locator
    • Automatic Transmission - 6T40 (MNH) - Description And Operation
    • Automatic Transmission - 6T40 (MNH) - Diagnostic Information And Procedures
    • Automatic Transmission - 6T40 (MNH) - Repair Instructions - Off Vehicle
    • Automatic Transmission - 6T40 (MNH) - Repair Instructions - On Vehicle
    • Automatic Transmission - 6T40 (MNH) - Schematic Wiring Diagrams
    • Automatic Transmission - 6T40 (MNH) - Special Tools And Equipment - Special Tools
    • Automatic Transmission - 6T40 (MNH) - Specifications
    • Automatic Transmission Cooling System
    • Electronic Transmission Range Select
    • Power Transfer Unit/Transfer Case - AAM
  • Hydraulic Diagrams
    • Automatic Transmission - 6T40 (MNH) - Description And Operation
  • Power Transfer Unit/Transfer Case - AAM
• External Pages