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Volvo 850 – how to use system wiring diagrams

Volvo 850 service & repair manual

HOW TO USE SYSTEM WIRING DIAGRAMS

1995 Volvo 850

GENERAL INFORMATION Using Wiring Diagrams
All Models

INTRODUCTION

This CD obtains wiring diagrams and technical service bulletins, containing wiring diagram changes from the domestic and import manufacturers. These are checked for accuracy and are all redrawn into a consistent format for easy use.
In the past, when cars were simpler, diagrams were simpler. All components were connected by wires and diagrams seldom exceeded 4 pages in length. Today, some wiring diagrams require more than 16 pages. It would be impractical to expect a service technician to trace a wire from page 1 across every page to page 16.
Removing some of the wiring maze reduces eyestrain and time wasted searching across several pages. Today the majority of these diagrams follow a much improved format, which permits space for internal switch details.
Wiring diagrams are drawn in a “top-down” format. The
diagrams are drawn with the power source at the top of the diagram and the ground point at the bottom of the diagram. Components locations
are identified on the wiring diagrams. Any wires that don’t connect directly to a component are identified on the diagram to indicate where they go.

COLOR ABBREVIATIONS

COLOR ABBREVIATIONS TABLE
Color Normal Optional
Black ……………. BLK …………………….. BK Blue …………….. BLU …………………….. BU Brown ……………. BRN …………………….. BN Clear ……………. CLR …………………….. CR Dark Blue ………. DK BLU …………………. DK BU Dark Green ……… DK GRN …………………. DK GN Green ……………. GRN …………………….. GN Gray …………….. GRY …………………….. GY Light Blue ……… LT BLU …………………. LT BU Light Green …….. LT GRN …………………. LT GN Orange …………… ORG …………………….. OG Pink …………….. PNK …………………….. PK Purple …………… PPL …………………….. PL Red ……………… RED …………………….. RD Tan ……………… TAN …………………….. TN Violet …………… VIO …………………….. VI White ……………. WHT …………………….. WT Yellow …………… YEL …………………….. YL

IDENTIFYING WIRING DIAGRAM ABBREVIATIONS

NOTE: Abbreviations used on these diagrams are normally self-explanatory. If necessary see ABBREVIATIONS
article in GENERAL INFORMATION.

IDENTIFYING WIRING DIAGRAM SYMBOLS

volvo 850 how to use wiring diagrams howto tutorial service repair manual
NOTE: Standard wiring symbol are used in these diagrams. The illustration below will help clarify any symbols that are not easily understood at a glance. Most components are labeled “Motor”, “Switch” or “Relay” in addition to being drawn with the standard symbol.
Fig. 1: Identifying Wiring Diagram Symbols

WIRING DIAGRAM COMPONENT LOCATIONS

When trying to locate a component in a wiring diagram and you don’t know the specific system where it is located, use this handy component locator to find the system wiring diagram in which the component is located. Then, go to that system and locate the component within the wiring diagram.
For example, if you don’t know the specific system in which the ignition switch is located, look up ignition switch in the wiring diagram component location tables and go to the appropriate wiring diagram(s) which contain either full or partial views of the ignition switch. The full view of the ignition switch is located in Power Distribution.
The first listing for the component will be the full or most complete view of the component. Additional listings will be partial views of the component. Not all components are used on all models.
All components will have a partial view in Ground Distribution and Power Distribution. Data Link Connectors show connecting circuits between modules. Alternate names for components may be listed in wiring diagram component locations tables.
WIRING DIAGRAM COMPONENT LOCATIONS TABLE
Component Wiring Diagram
ABS Electronic Control Unit ………………….. Anti-Lock Brakes
Data Link Connectors ABS Hydraulic Unit ………………………….. Anti-Lock Brakes Acceleration Sensor …………………………. Anti-Lock Brakes Accessory Delay Relay ………………………….. Power Windows A/C Compressor Clutch Relay ………………… Engine Performance A/C Sensor ……………………………….. Engine Performance A/C Pressure Switch ……………………….. Engine Performance Adaptive Lamp Control Module ………………….. Exterior Lights Air Bag(s) ………………………….. Air Bag Restraint System Air Bag Module ………………………. Air Bag Restraint System Air Bag Sensor(s) ……………………. Air Bag Restraint System Air Injection Pump Relay …………………… Engine Performance Air Temperature Sensor ………………………. Overhead Console Alternator (Generator) ………………… Generators & Regulators Anti-Theft Control Module …………………… Anti-Theft System Starters
Autolamp Control Relay ……………………… Headlight Systems
Daytime Running Lights Automatic Shutdown (ASD) Relay ……………… Engine Performance Generators & Regulators
Autostick Switch ………………………….. Engine Performance Auxiliary Battery Relay ……………….. Generators & Regulators Back-Up Lights ……………………………….. Back-Up Lights Exterior Lights
Barometric (BARO) Pressure Sensor …………… Engine Performance Battery ………………………………….. Power Distribution Battery Temperature Sensor …………………. Engine Performance Body Control Module …………………….. Body Control Computer Anti-Theft System
Daytime Running Lights Engine Performance Headlight Systems Warning Systems
Boost Control Solenoid …………………….. Engine Performance Boost Sensor ……………………………… Engine Performance Brake Fluid Level Switch ……………… Analog Instrument Panels
Brake On/Off (BOO) Switch ………………. Cruise Control Systems
Engine Performance
Shift Interlock Systems Buzzer Module ……………………………….. Warning Systems Camshaft Position (CMP) Sensor ……………… Engine Performance Central Control Module ……………………… Anti-Theft System Clockspring …………………………. Air Bag Restraint System Cruise Control Systems
Steering Column Switches Clutch Pedal Position Switch ………………………… Starters Clutch Start Switch ………………………………… Starters Combination Meter ……………………. Analog Instrument Panels Constant Control Relay Module (CCRM) ………… Engine Performance Electric Cooling Fans
Convenience Center ………………………… Power Distribution
Illumination/Interior Lights Convertible Top Motor …………………… Power Convertible Top Convertible Top Switch ………………….. Power Convertible Top Crankshaft Position (CKP) Sensor ……………. Engine Performance Cruise Control Module ………………….. Cruise Control Systems Cruise Control Switch ………………….. Cruise Control Systems Condenser Fan Relay(s) ………………….. Electric Cooling Fans Data Link Connector (DLC) ………………….. Engine Performance Daytime Running Lights Module …………… Daytime Running Lights Exterior Lights
Defogger Relay ………………………….. Rear Window Defogger Diagnostic Energy Reserve Module (DERM) … Air Bag Restraint System Discriminating Sensor (Air Bag) ……….. Air Bag Restraint System Distributor ………………………………. Engine Performance Door Lock Actuators …………………………. Power Door Locks Remote Keyless Entry
Door Lock Relay(s) ………………………….. Power Door Locks Electrochromic Mirror ………………………….. Power Mirrors Electronic Level Control (ELC)
Height Sensor ………………………… Electronic Suspension Electronic Level Control (ELC) Module …….. Electronic Suspension Engine Coolant Temperature (ECT)
Sending Unit ………………………. Analog Instrument Panels Engine Coolant Temperature (ECT) Sensor ……… Engine Performance Engine Control Module ……………………… Engine Performance Generators & Regulators
Starters ETACS ECU …………………………………… Warning Systems Power Windows
Remote Keyless Entry Evaporative (EVAP) Emissions Canister ……….. Engine Performance EVAP Canister Purge Solenoid ……………….. Engine Performance EVAP Canister Vent Solenoid ………………… Engine Performance Exhaust Gas Recirculation (EGR) Valve ……….. Engine Performance Fuel Tank Vacuum Sensor ……………………. Engine Performance Fog Lights ………………………………… Headlight Systems Daytime Running Lights
Fog Light Relay ……………………………. Headlight Systems
Daytime Running Lights Fuel Door Release Solenoid …………….. Power Fuel Door Release Fuel Gauge Sending Unit ………………. Analog Instrument Panels Fuel Injectors ……………………………. Engine Performance Fuel Pump ………………………………… Engine Performance Fuel Pump Relay …………………………… Engine Performance Power Distribution
Fuse/Relay Block ………………………….. Power Distribution Fusible Links …………………………….. Power Distribution Generators & Regulators
Starters Generator ……………………………. Generators & Regulators Engine Performance
Power Distribution Generic Electronic Module (GEM) …………… Body Control Modules Electronic Suspension
Glow Plug Relay …………………………… Engine Performance Glow Plugs ……………………………….. Engine Performance Grounds …………………………………. Ground Distribution Headlight Door Module ………………………… Headlight Doors Headlight Relay ……………………………. Headlight Systems Daytime Running Lights
Headlights ………………………………… Headlight Systems
Daytime Running Lights Heated Oxygen Sensor(s) (HO2S) ……………… Engine Performance Heated Windshield Control Module ……………. Heated Windshields Height Sensor ………………………….. Electronic Suspension Horns ………………………………. Steering Column Switches Horn Relay ………………………….. Steering Column Switches Idle Air Control (IAC) Motor/Valve ………….. Engine Performance Ignition Coil(s) ………………………….. Engine Performance Ignition Key Lock Cylinder ………………….. Anti-Theft System Ignition Module …………………………… Engine Performance Ignition Switch …………………………… Power Distribution Engine Performance
Generators & Regulators
Starters Illuminated Entry Module ………….. Illumination/Interior Lights Illumination Lights ………………. Illumination/Interior Lights Impact Sensor ……………………….. Air Bag Restraint System Inertia Fuel Shutoff Switch ………………… Engine Performance Inhibit Relay ……………………………………… Starters Instrument Cluster …………………… Analog Instrument Panels Intake Air Temperature (IAT) Sensor …………. Engine Performance Interior Lights ………………….. Illumination/Interior Lights Interlock Switch …………………………………… Starters Junction Block ……………………………. Power Distribution Keyless Entry Receiver …………………… Remote Keyless Entry Key Reminder Switch ………………………………… Starters Knock Sensor ……………………………… Engine Performance Lamp Control Module ………………………….. Exterior Lights License Plate Lamp …………………………… Exterior Lights Lighting Control Module ………………. Lighting Control Modules Anti-Theft System
Daytime Running Lights
Headlight Systems Lower Relay ……………………………. Power Convertible Top Malfunction Indicator Light (MIL) …………… Engine Performance Instrument Panels
Manifold Absolute Pressure (MAP) Sensor ……… Engine Performance Mass Airflow (MAF) Sensor ………………….. Engine Performance Mega Fuse ……………………………. Generators & Regulators Memory Seat/Mirror Module ……………………… Memory Systems Mirror Defogger …………………………. Rear Window Defogger Moon Roof Motor ……………………………… Power Moon Roof Moon Roof Relay ……………………………… Power Moon Roof Multi-Function Control Module …………………. Warning Systems Neutral Safety Switch ………………………………. Starters Oil Level Switch ………………………….. Engine Performance Oil Pressure Switch/Sending Unit ………. Analog Instrument Panels Engine Performance
Overhead Console ……………………………. Overhead Console
Oxygen Sensor(s) (O2S) …………………….. Engine Performance
Parking Brake Switch …………………. Analog Instrument Panels Park Lights …………………………………. Exterior Lights Park/Neutral Position Switch ………………………… Starters Engine Performance
Anti-Theft System
Body Control Module Perimeter Lighting Control Relay ………………. Exterior Lights Power Amplifier ………………………………. Power Antennas Power Antenna Module ………………………….. Power Antennas Power Antenna Motor …………………………… Power Antennas Power Distribution Center ………………….. Power Distribution Generators & Regulators
Starters Power Door Lock Motors ………………………. Power Door Locks Power Mirror Motors ……………………………. Power Mirrors Memory Systems
Power Sliding Door Controller ………….. Power Sliding Side Door Power Seat Motors ……………………………….. Power Seats Memory Systems
Power Steering Pressure Switch ……………… Engine Performance Power Top Motor ………………………… Power Convertible Top Power Top Relay(s) ……………………… Power Convertible Top Powertrain Control Module ………………….. Engine Performance Analog Instrument Panels
Cruise Control Systems Data Link Connectors Generators & Regulators Starters
Power Window Motors ……………………………. Power Windows Power Window Relay(s) ………………………….. Power Windows Radiator Fan Motor(s) …………………… Electric Cooling Fans Radiator Fan Relay(s) ……………………… Engine Performance Electric Cooling Fans
Rainsense Module ………………………… Wiper/Washer Systems Raise Relay ……………………………. Power Convertible Top Remote Anti-Theft Personality (RAP) Module ……. Anti-Theft System Starters
Warning Systems Seat Belt Pretensioners ………………. Air Bag Restraint System Seat Belt Retractor Solenoid ……………….. Passive Restraints Seat Belt Switch …………………….. Air Bag Restraint System Passive Restraints
Shift Interlock Solenoid ………………. Shift Interlock Systems Shift Lock Actuator …………………… Shift Interlock Systems Side Marker Lights …………………………… Exterior Lights SIR Coil Assembly (Clockspring) ……….. Air Bag Restraint System Slip Ring (Clockspring) ………………. Air Bag Restraint System Steering Column Switches
SRS Control Module …………………… Air Bag Restraint System Starter Motor ……………………………………… Starters Starter Interrupt Relay …………………………….. Starters Starter Solenoid …………………………………… Starters Starter Relay ……………………………………… Starters Steering Wheel Position Sensor ……………….. Anti-Lock Brakes Stoplights ………………………………….. Exterior Lights Stoplight Switch ………………………….. Engine Performance Cruise Control Systems
Anti-Lock Brakes Sun Roof ECU …………………………………. Power Sun Roof Sun Roof Motor ……………………………….. Power Sun Roof Sun Roof Position Sensor ………………………. Power Sun Roof Taillights ………………………………….. Exterior Lights Throttle Position (TP) Sensor ………………. Engine Performance
Torque Converter Clutch Solenoid/Switch ……… Engine Performance Traction Control Switch ……………………… Anti-Lock Brakes Trailer Tow Connector ………………………… Exterior Lights Trailer Tow Relay ……………………………. Exterior Lights Transmission/Transaxle …………………….. Engine Performance Transmission Control Module (TCM) …………… Engine Performance Starters
Transmission Range Sensor …………………………… Starters Back-Up Lights Engine Performance
Transmission Range Switch ……………………… Back-Up Lights Engine Performance Anti-Theft System
Turn Signal Flasher ………………………….. Exterior Lights Turn Signal Lights …………………………… Exterior Lights Twilight Sentinel Switch ……………………. Headlight Systems Daytime Running Lights
Vapor Canister Leak Detection Pump ………….. Engine Performance Vehicle Control Module (VCM) ……………….. Engine Performance Vehicle Dynamic Module ………………….. Electronic Suspension Vehicle Speed Control Servo …………….. Cruise Control Systems Vehicle Speed Sensor …………………….. Data Link Connectors Analog Instrument Panels
Cruise Control Systems
Electronic Suspension Voltage Regulator …………………….. Generators & Regulators Water-In-Fuel Sensor ………………………. Engine Performance Analog Instrument Panels
Wheel Speed Sensors …………………………. Anti-Lock Brakes Window Timer Module …………………….. Power Convertible Top Windshield Intermittent Wiper Relay ……….. Wiper/Washer Systems Windshield Washer Motor ………………….. Wiper/Washer Systems Wiper Motor …………………………….. Wiper/Washer Systems

 

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