Wiring diagrams for Discovery vehicles produced since 1989 (Discovery 1)

How to use electrical diagrams

The figure shows the dotted line:

From the component connector A137 there is a white wire with a cross-section of 0.5 mm² going to the component connector Y135.
From the Y135 component connector, a white wire with a cross-section of 0.5 mm² goes to pin 1 of the A137 component connector.

The code is also duplicated by a graphic symbol.

System element code and description

The code consists of a letter and a number. The letter denotes the element group, and the number denotes the feature of the system element.

Address code

The address code indicates which system element the wire goes to, the color of the wire, and which connector pin.

Graphic symbols are used to help identify system elements. Electrical symbols and element symbols comply with ISO and DIN standards.

Pin codes indicate the pins that are connected on a given element. They are marked according to DIN standards. The pins of the multi-pin connectors are numbered. The terminals are not always marked, especially on simple components with a limited number of connections

bl	blue
ge	yellow
nf	grayish
rt	red
ws	white
hgn	light green
br	brown
gn	green
og	orange
sw	black
hbl	light blue
rbr	dark burgundy
el	cream
gr	grey
rs	pink
vi	violet

K20 Fuel pump relay. Fuel pump relay

K22 Glow plug relay. Glow plug relay

K24 Electric window motor relay. Power window relay

K25 Electric window motor relay H. Window lifter relay II

K26 AC auxiliary fan relay. Additional air conditioner fan relay

K28-I Heater motor relay. Heater fan relay

K28-II Heater motor relay. Heater fan relay

K46 Fuel Injection relay. Fuel injection system relay

K62 HeadHght washer delay relay. Headlight washer relay with time delay

K68 Power saving relay. Energy-saving relay

K72 AC switch-over relay. Air conditioner relay

K94 Lambda system, relay. Oxygen sensor relay

K102 Dim-dip relay. Headlight high/low beam switch relay

K112 Heater relay. Heater relay

K143 AC compressor clutch relay. Air conditioning compressor electromagnetic clutch relay

K144 AC recirculation control motor relay. Air recirculation flap drive motor relay (air conditioner)

M1 Starter motor. Starter

F35 FueWelinkcabte. Fuse wire

G1 Alternator. Alternator

H8 Indicator lamp, left front. Left front turn signal lamp

H9 Indicator lamp, right front. Right front turn signal lamp

H13 Turn signal repeater/side marker lamp, left (left side)

H14 Indicator repeater/Side marker lamp, right (right side)

K1 Headlamp relay. Relay for switching on low and high beams

K4 Starter relay. Starter relay

K5 Indicator relay. Direction indicator relay

K6 Hazard tempt relay. Emergency signaling relay

K7 Intermittent wiper relay. Windshield wiper relay

K9 Rear intermittent wiper relay. Rear window wiper relay

K12 Coolant blower motor relay. Cooling fan relay

K13 Heated rear window relay. Rear window defroster relay

K14 Hom relay. Horn relay

K17 AC Relay. Air Conditioner Relay

K20 Fuel pump relay. Fuel pump relay

E5 Side lamp, top (see E1). Left side lamp bulb

E6 Side lamp, right (see E2). Right side light bulb

E9 Number plate lamp, left. Number plate lamp, left

E10 Number plate lamp, right. Number plate lamp, right

E12 Interior lamp/s front. Front interior lighting lamp

E23 Clock. Clock

E28 Heater control lamp/s. Heater control panel illumination lamp

E29 Cigarette Lighter Lamp (Tee R3)

E74 Interior lamp front II. Front lamp II for interior lighting

E85 Radio Illumination lamp. Radio backlight lamp

FA1-FC9 Fuse box. Fuses

B24 Fuel injection coolant temperature sensor. Coolant temperature sensor (fuel injection system)

B25 Fuel Injection air temperature sensor. Air temperature sensor (fuel injection system)

B30 Air Flow Sensor

B31 Fuel injection fuel temperature sensor. Fuel temperature sensor (fuel injection system)

B36 Temperature sensor. Temperature sensor

B50 Radio speaker, right front. Radio speaker, right front

B51 Radio speaker, left rear. Radio speaker, left rear

B52 Radio speaker, right rear. Radio speaker, right rear

B54 Crank angle sensor. Crankshaft position sensor

B55 Speed sensor. Speed sensor

B69 Knock sensor. Knock sensor

B72 Lambda probe. Oxygen sensor

B72-I Lambda probe. Oxygen sensor

B72-II Lambda probe. Oxygen sensor

B96 Alarm system horn. Anti-theft alarm sound signal

C1 Battery

C3 Radto suppressor. Radio interference suppressor

E1 Headlamp, left. Left headlight bulb

E2 Headlamp, right. Right headlight bulb

A35 Engine management control unit. Electronic engine control unit

A63 AC control unit. Air conditioning control unit

A125 Alarm system signal control unit. Anti-theft alarm system block

B1 Hom, left orringte. Sound signal, left or single

B2 Home, light. Sound signal, right

B3 Fuat gauge tank transmitter. Fuel level sensor

B4 Coolant temperature transamltter. Coolant temperature sensor

B8 Radio speaker, left front or tingle. Radio speaker, left front or single

B10 AC coolant thermoswitch. Thermal switch in the air conditioner cooling circuit

B13 Brake pad wear sensor, right front. Brake pad wear sensor (right front)

B15 Brake pad wear tent, right rear. Brake pad wear sensor (right rear)

B24 Fuel injection coolant temperature tenter. Coolant temperature sensor (fuel injection system)

A1 Rado/Sterao unit. Radio

A4 Ignition control unit. Ignition control unit

A5 Instrument panel. Instrument panel

A6 Digital clock. Watch

A8 Rear lamp assembly, left

A10 Rear lamp assembly, right

A23 Alarm system control unit. Anti-theft alarm control unit

A35 Engine management control unit. Electronic engine control unit

S10	Rear wiper/washer switch	Rear wash/wipe switch
S13	Brake light switch	Stop lamps switch
S15	Horn switch (see S6)	Hom switch (see S6)
S16	Remote interior light switch (see S3)	Interior lamp remote switch (see S3)
S17	Heater/Air Conditioner Fan Switch	Heater/AC motor switch
S18	Local lighting lamp switch (left front)	Courtesy lamp switch, left front
S19	Local lighting lamp switch (right front)	Courtesy lamp switch, right front
S20	Local lighting lamp switch (left rear)	Courtesy lamp switch, left rear
S21	Local lighting lamp switch (right rear)	Courtesy lamp switch, right rear
S22	Tailgate/trunk light switch	Courtesy lamp switch, tailgate/boot
S23	Hood actuator switch	Bonnet switch
S25	Oil pressure warning light switch	Oil pressure warning lamp switch
S28	Reverse light switch	Reversing lamp/s switch
S29	Engine start inhibit switch (models with automatic transmission)	AT inhibitor switch
S30	Rear window defroster switch	Heated rear window switch
S32	Rear fog light switch	Rear fog lamps switch
S33	Brake fluid level indicator light switch	Brake fluid level warning lamp switch
S35	Parking brake indicator lamp switch	Handbrake warning lamp switch
S39	Inertia switch of the fuel shut-off solenoid valve	Inertia switch fuel cut-off
S42	Air damper position indicator switch	Choke warning lamp switch
S51	Temperature control system switch (air conditioner)	AC temperature control switch
S64	Driver's door window switch	Electric window switch, driver's door
S65	Front passenger door window switch	Electric window switch, front passenger door
S66	Left rear door window switch	Electric window switch, left rear
S67	Right rear door window switch	Electric window switch, right rear
S70	Left rear window switch (on the console)	Electric window switch, left rear console
S71	Right rear window switch (on the console)	Electric window switch, right rear console
S72	Power window safety switch	Electric window safety switch
S81	Switch II for heater/air conditioning fan (see S17)	Heater/AC motor switch II (see S17)
S98	Side rearview mirror adjustment mechanism switch	Mirror adjustment switch
S100	Central locking switch	Central locking switch
S152	Air conditioner safety switch (high refrigerant pressure)	AC high pressure safety switch
S153	Air conditioner switch (low refrigerant pressure)	AC low pressure switch
S163	Windshield wiper limit switch	Windscreen wiper contact switch
S192	Heater coolant line valve switch	Heater water valve, switch
S201	Remote control for radio	Radio/Stereo remote control switch
S213	Automatic air conditioning control system selector	AC automatic control selector
S217	Headlight adjustment switch	Headlamp beam adjustment switch
S239	Remote switch II for interior lighting (see S16)	Interior lamp remote switch II (see S16)
S252	Driver's door handle/lock limit switch	Door handle/lock switch, driver
S265	All-wheel drive mode switch	Four wheel drive switch
S278	High differential oil temperature warning switch	Differential oil temperature warning switch
T	Transformers
T1	Ignition coil	Ignition coil
V	Semiconductors
V6	Anti-theft system LED	Alarm system LED
V11	Air conditioner diode	AC diode
V16	Air conditioner diode II	AC diode II
X	Connectors
X1	Diagnostic connector	Diagnostic socket
X2	Trailer electrical connector	Trailer socket
Y	Solenoids
Y3	Fuel injection system injectors	Fuel injection solenoids
Y10	Two-way air conditioner solenoid valve	AC two-way valve
Y11	Air conditioning compressor electromagnetic clutch	AC compressor clutch
Y12	Fuel shut-off solenoid valve	Fuel cut-off valve
Y55	Heater water solenoid valve	Heater water valve
Y92	Fuel vapor recovery system shut-off solenoid valve	Purge cut-off solenoid valve
K13	Rear window defroster relay	Heated rear window relay
K14	Horn relay	Horn relay
K17	Relay I for turning on the air conditioner	AC relay I
K20	Electric fuel pump relay	Fuel pump relay
K22	Glow plug relay	Glowplug relay
K24	Window lifter motor relay	Electric window motor relay
K25	Relay II for switching on the window lifter motor	Electric window motor relay II
K26	Air conditioner auxiliary fan relay	AC auxiliary fan relay
K28	Heater fan motor relay	Blower motor relay
K46	Fuel injection system relay I	Fuel injection relay I
K62	Headlight washer relay with time delay	Headlight washer delay relay
K68	Energy-saving relay	Power saving relay
K72	Air conditioner shutdown relay	AC switch-over relay
K94	Oxygen sensor relay (lambda probe)	Lambda system, relay
K102	Relay I of the high-low beam switch	Dim-dip relay I
K112	Heater relay	Heater relay
K143	Air conditioning compressor electromagnetic clutch relay	AC compressor clutch relay
K144	Relay for turning on the electric motor of the air conditioner recirculation flap drive	AC recirculation control motor relay
M	Engines
M1	Starter	Starter motor
M2	Windshield wiper drive motor	Wiper motor
M3	Electric washer pump	Washer motor
M4	Rear window wiper motor	Rear wiper motor
M5	Rear window washer electric pump	Rear washer motor
Mb	Cooling system fan motor	Coolant blower motor
M7	Heater/Air Conditioner Blower Motor	Heater/AC blower motor
M10	Headlamp washer pump, left or single	Headlamp wash, left or single
M12	Electric fuel pump	Fuel pump
M14	Driver's window lift motor	Electric window motor, driver
M15	Passenger window lift motor	Electric window motor, passenger
M16	Rear left window lift motor	Electric window motor, rear left
M17	Rear right window lift motor	Electric window motor, rear right
M27	Outside rearview mirror drive motor (from the driver's side)	Door mirror motor, driver
M28	Outside rearview mirror drive motor (from the passenger side)	Door mirror motor, passenger
M31	Air conditioner evaporator electric fan	AC evaporator blower motor
M35	Headlight drive motor, left or single	Headlamp motor, left or single
M36	Headlight motor, right	Headlamp motor, right
M42	Stepper motor / stepper motor for mixture quality control system	Stepper/Mixture control motor
M47	Electric motor of the central locking system (left rear door)	Central locking motor, left rear
M48	Electric motor of the central locking system (front passenger door)	Central locking motor, passenger front
M49	Electric motor of the central locking system (rear right door)	Central locking motor, right rear
M58	Electric motor of the central locking system (trunk lid/tailgate)	Central locking motor, bootlid/tailgate
M63	Air conditioner condenser electric fan	AC condenser fan motor
R	Resistors
R2	Rear window defroster heating element	Heated rear window
R3	Cigarette lighter	Cigarette lighter
R6	Resistor in the heater fan motor circuit (see M7)	Heater motor resistor (see M7)
R26	Side rearview mirror heater (see M27, driver's side)	Heated mirror (see M27), driver
R27	Side rearview mirror heater (see M28, passenger side)	Heated mirror (see M28), passenger
R29	Resistor II of the heater electric fan (see R6)	Heater motor resistor II (see R6)
R41	Fuel injection system series resistor	Fuel injection series resistor
R61	Resistor in the air conditioner condenser cooling fan motor circuit	AC condenser fan resistor
R62	Air-fuel ratio control resistor	Mixture adjustment resistor
R65	Position sensor (potentiometer) throttle valve	Throttle valve potentiometer
S	Switches
S1	Ignition/starter switch (lock)	Ignition/Starter switch
S3	Light switch	Main lamp switch
S4	Headlight high/low beam switch/headlight flasher (see S6)	Dip/main/flash switch (see S6)
S5	Direction indicator switch (see S6)	Indicator switch (see S6)
S8	Windscreen wiper/washer switch (see S6, S7)	Wipe/wash switch (see S6,S7)
A	Nodes
A1	Radio	Radio/Stereo unit
A4	Ignition control unit	Ignition control unit
A5	Instrument panel (see X20-X25)	Instrument panel (see X20-X25)
A6	Clock (see A5)	Digital clock (see A5)
A8	Rear left light bulb assembly	Rear lamp assembly, left
A10	Right rear light bulb assembly	Rear lamp assembly, right
A23	Anti-theft alarm control unit	Alarm system control unit
A35	Electronic engine control unit	Engine management control unit
A63	Air conditioning control unit	AC control unit
A125	Alarm system signal control unit	Alarm system signal control unit
IN	Sensors
B1	Sound signal, left or single	Horn, left or single
B2	Horn, right	Horn, right
VZ	Fuel level sensor	Fuel gauge tank transmitter
B4	Coolant temperature sensor	Coolant temperature transmitter
B8	Radio speaker, left front or single	Radio speaker, left front or single
B10	Thermal switch in the air conditioner cooling circuit	AC coolant thermoswitch
B13	Brake pad wear sensor (right front)	Brake pad wear sensor, right front
B15	Brake pad wear sensor (right rear)	Brake pad wear sensor, right rear
B24	Coolant temperature sensor (fuel injection system)	Fuel injection coolant temperature sensor
B25	Air temperature sensor (fuel injection system)	Fuel injection air temperature sensor
B30	Air flow sensor	Air flow sensor
B31	Fuel temperature sensor (fuel injection system)	Fuel injection fuel temperature sensor
B36	Temperature sensor	Temperature sensor
B50	Radio speaker, right front	Radio speaker, right front
B51	Radio speaker, left rear	Radio speaker, left rear
At 52	Radio speaker, right rear	Radio speaker, right rear
B54	Crankshaft position sensor	Crank angle sensor
B55	Speed sensor	Speed sensor
B69	Knock sensor	Knock sensor
B72	Oxygen sensor (lambda probe)	Lambda probe
WITH	Batteries and capacitors
C1	Battery	Battery
C3	Radio interference suppressor	Radio suppressor
E	Lamps
E1	Left headlight bulb (see A7)	Headlamp, left (see A7)
E2	Right headlight bulb (see A9)	Headlamp, right (see A9)
E5	Left side light bulb (see E1)	Side lamp, left (see E1)
E6	Right side light bulb (see E2)	Side lamp, right (see E2)
E9	License plate light, left or single	Number plate lamp, left or single
E10	License plate light, right	Number plate lamp, right
E12	Front interior light	Interior lamp/s front
E23	Clock (see A5)	Clock (see A5)
E28	Heater control panel illumination lamp	Heater control lamp/s
E29	Cigarette lighter illumination lamp (see R3)	Cigarette lighter lamp (see R3)
E74	Front lamp II interior lighting	Interior lamp front II
E85	Radio backlight lamp	Radio illumination lamp
F	Fuses and protective devices
F1-F30	Fuse box (see X28)	Fuse box (see X28)
F35	Air conditioning evaporator pump circuit fuse	AC evaporator pump line fuse
G	Generators
G1	Generator	Alternator
H	Warning signs
H8	Left front turn signal lamp	Indicator lamp, left front
H9	Right front turn signal lamp	Indicator lamp, right front
H13	Turn signal repeater/side marker light(left side)	Indicator repeater/Side marker lamp, left
H14	Turn signal repeater/side marker light (right side)	Indicator repeater/Side marker lamp, right
K	Relay
K1	Headlight low and high beam relay	Headlamp relay
K4	Starter relay	Starter relay
K5	Direction indicator relay	Indicator relay
K6	Emergency signaling relay	Hazard lamps relay
K7	Windshield wiper relay	Intermittent wiper relay
K9	Rear window wiper relay	Rear intermittent wiper relay
K12	Cooling system fan motor relay	Coolant blower motor relay

Connection symbols

Plug and socket	Shielded wire	Connection without wire, i.e. printed circuit or internal connection
Multi-pin connector	Shielded wire bundle
Fixed (soldered connection)	Color change	In some circuits, wire color coding has been replaced by wire numbers, which designate a specific wire and are independent of color. In this case, the wire is numbered at each end
Fixed (fastened with a bolt or nut)	Changing the color of a wire in a wiring harness
Wire connected to ground	Capacitor, capacity
Direct mass (without wire, grounding through the element body)	Resistance
Wire going to alternative equipment	Induction coil	Any color code with a line under it is the color of a plastic or rubber ring, color strip, or color of a wire connector, not the main color of the wire
A soldered or crimped connection where the wire is divided into several directions	Blocking diode	Multi-pin connectors are marked with letters, numbers and/or colors (example: X14(J) rt)
Changing the wiring connection method according to model/year	Fuses (line fuse)	Two circuit elements are combined into one node S3/R4