How to Use Diagrams

Diagram Layout

[diagram example]

Key To Image

  1. Coordinates
  2. Wire cross section size with wire color code (E.G. 6.0 sq.mm, Red)
  3. Terminal designation (E.G. Terminal 30)
  4. Part designation and connection of wire (See Component Index)
  5. Alpha-numeric Coordinate of the field to which the wire continues
  6. Welded connection point or harness splice
  7. Ground point
  8. Wiring harness with harness designation (E.G. Harness number 31)
  9. Single plug connection
  10. Multiple plug connection

Diagram Sections, Fields and Wire Continuations

Porsche wiring diagrams are separated into diagram sections and use a coordinate system which divides each section into small fields. Letter coordinates span across the top and bottom of each diagram section and numeric coordinates span down each side of the diagram section. Since wiring often continues from one diagram section to a different diagram section, the alpha-numeric coordinate (5) is used to identify a field in a new diagram section in which a circuit is to be continued. To follow a circuit that continues to a new diagram section, determine the color and size of the wire, identify the new diagram section alpha-numeric coordinate, and go to the field coordinate of the new diagram section. Note that there may be more than one circuit that is continued to this field and you will need the field coordinate from which the circuit was continued and the color code of the wire to identify the correct circuit.

Wire Color Code Identification

Code Color
BK or SW black
WT or WS white
RE or RT red
GN green
YE or GE yellow
GR grey
BR brown
BL blue
VI or LI violet
PK pink
OR orange

M-Numbers

M-Number Description
M 061 England Version
M 139 Adjustable Seat Heating Seat Left
M 193 Japan Version
M 208 Trailer Coupling
M 215 Saudi Arabia Version
M 221 PSD Porsche Lock Differential
M 249 Automatic Transmission
M 261 Outside Mirror Flat Passenger's Side
M 326 Radio Berlin
M 340 Adjustable Seat Heating Seat Right
M 383 Sport Seat Left
M 387 Sport Seat Right
M 454 Cruise Control
M 479 Australian Version
M 481 Transmission
M 482 RDK Tire Pressure Control
M 484 USA Version
M 513 Lumbar Support Seat Right
M 525 Alarm System with Continuous Tone (Switzerland)
M 528 Outside Mirror Convex Passenger's Side
M 533 Alarm System with Interval Tone
M 537 Seating Position Control Comfort Seat Left
M 538 Seating Position Control Comfort Seat Right
M 553 USA - Canada Version
M 562 Airbag
M 570 Additional Air Conditioner (Increased Refrigerating Capacity)
M 576 Rear Fog Light
M 586 Lumbar Support Seat Left
M 593 ABS System
M 650 Electric Sun Roof

Construction Components

[location diagram]

Component
Number		 Component Description Position in
Vehicle		 Coordinate
Location
1 ABS/DIFFERENTIAL LOCK CONTROL UNIT 7cQ AB 73-76
2 ALARM SYSTEM CONTROL UNIT 7cM OP 67/68
3 ALARM SYSTEM RELAY 8dN LM 62/63
4 ALARM SYSTEM ADDITIONAL CONTROL UNIT 8dN OP 64/65
5 OUTSIDE TEMPERATURE SENSOR 2/3dQ G 31
6 ACCELERATING SENSOR 10eQ K 73
7 BOOSTER 11eK FG 62/63
8 RECEIVER FOR RADIO BERLIN 7cL C 66
9 SUPPRESSOR FOR RADIO BERLIN 11eK A 62
10 SUPPRESSOR FOR RADIO 8dO C 62
11 SWITCHING UNIT EX (M193) 8dN P 28-30
12 EZK CONTROL UNIT 7dL L 82-84
13 REAR WINDOW WIPER RELAY 18cO OP 17
14 HIGH PRESSURE AND LOW PRESSURE SWITCH 2dM P 32
15 AIR CONDITIONING SYSTEM CONTROL UNIT 8cN/O AB 34-36
16 COOLANT FAN FINAL STAGE 1cN O 39/40
17 COOLANT FAN CONTROL UNIT 10eK MNO 39/40
18 COOLING WATER PRESSURE SWITCH 5cM MN 29/30
19 COOLING WATER TEMPERATURE SWITCH 6cM MN 29
20 BULB CONTROL UNIT 7cL NO 1
21 IDLE SPEED COADJUSTMENT POTENIOMETER 7dL OP 88
22 LH JETRONIC CONTROL UNIT 7dL J 87-89
23 SOLENOID VALVE LOCK DIFFERENTIAL 17dQ C 72
24 SOLENOID VALVE (ADDITIONAL AIR CONDITIONER) 10eM F 38
25 OIL LEVEL SWITCH 3eN/O O 26
26 OIL TEMPERATURE SWITCH (M249) 13eO P 35/36
27 PUMP LOCK DIFFERENTIAL 17dQ B 77/78
28 PUMP RELAIS LOCK DIFFERENTIAL 16dO B 79/80
30 CONTROL FOR ADDITIONAL AIR CONDITIONER 12dN EF 39/40
31 TIRE PRESSURE CONTROL UNIT 7cP K 76-78
32 SEAT MEMORY CONTROL UNIT LEFT 10dP K-O 57
33 SEAT MEMORY CONTROL UNIT RIGHT 10dM K-O 57
34 MIRROR MEMORY CONTROL UNIT 7cQ O 54-57
35 CRUISE CONTROL CONTROL UNIT 7dN/O AB 89/90
36 FREEZING PROTECTION SWITCH AIR CONDITIONER 7cM FG 31
37 RESISTOR INSTRUMENT LIGHTS 7eP DE 21/22
38 WARNING BUZZER 8cP D 30
39 WASHING FLUID LEVEL SWITCH 6cL M 29
40 RESISTANCE FROUP FOR BLOWER 7cL/M KL 31/32
41 RESISTANCE GROUP FOR ADDITIONAL AIR CONDITIONER 12dO HJ 37/38
42 TIME RELAY 8dN P 23-25
43 CENTRAL ELECTRIC 7dM Passenger's Footwell/Firewall
44 IGNITION CIRCUIT CONTROL CONTROL UNIT 7dL HJ 81/82
- POWER WINDOW/SUN ROOF CONTROL UNIT 10eQ JK 13/14
- CENTRAL LOCK CONTROL UNIT 8dO JKL 11/12

Plug Connections

Component
Number 		Number
of Pins		 Component Description Position in
Vehicle		 Coordinate
Location
T1 2 GLOVE BOX LAMP 7cL CD1, P13
T2 3 ENGINE COMPARTMENT LAMP, HEATED SPRAY JET RIGHT 6cO C4,C11
T3 26 DOOR DRIVER'S SIDE 7cQ C44, C55-60, D22, G16, P13
T4 26 DOOR PASSENGER 'S SIDE 7cL C42, C52-54, M16
T5 30 INSTRUMENT SCUTTLE 7cQ C-F4, F-H3, C13-16, K23, H33
T6 12 DOOR DRIVER'S SIDE 7cQ C44, C60, F63, G14, H1
T7 4 TRANSMISSION 16dO P5,G29
T8 2 LICENSE PLATE LIGHTS 18cN P6
T9 2 DOOR CONTACT SWITCH TAILGATE 18c0 N9
T10 6 REAR WIRE HARNESS/B-PILLAR 13dL LM10,N31-32
T11 8 B-PILLAR/TAILGATE 13aN K10, NO31
T12 2 SIDE MARKER LAMP LEFT REAR 18cO O10
T13 2 SIDE MARKER LIGHT RIGHT REAR 18cN O2
T14 3x2 BRAKE PAD WEAR CONTACT, SPEED SENSOR LEFT FRONT 5cP G78
T15 3x2 BRAKE PAD WEAR CONTACT, SPEED SENSOR RIGHT FRONT 5cM F78
T16 3x2 BRAKE FAD WEAR CONTACT, SPEED SENSOR LEFT REAR 16dO E78
T17 3x2 BRAKE FAD WEAR CONTACT SPEED SENSOR RIGHT REAR 16dO E78
T18 14 FRONT END/ENGINE WIRE HARNESS 3cM O26, O33, JK39,D83
T19 26 INSTRUMENT PANEL/REAR WIRE HARNESS 7dL E13, GH28, HJ23, M4
T20 14 SEAT DRIVER'S SIDE 10eO K43-44, HJ46, F58-60
T21 14 SEAT PASSENGER'S SIDE 10eL H42, F51-53, G63
T22 12 DOOR PASSENGER'S SIDE 7cL C42, C51, G63, J1, L14
T23 21 ABS 6dQ K74-76, F30
T24
T25 		6 TRAILER HITCH 6dL OP74
T26
T27 		2 HEATED SPRAY JET LEFT 6cO C12
T28 4 PULSE SENDER 16dO G29
T29 4 AIR CONDITIONING SYSTEM 8cN F33
T30 6 AIR CONDITIONING SYSTEM 8cN F33-34
T31 4 INSIDE TEMP SENSOR FOR AIR CONDITIONER 8cN BC33
T32 3 AUTOMATIC TRANSMISSION 16dO O35, D86
T33 6 FRONT END/INSTRUMENT PANEL WIRE HARNESS 6dL C2, M38, N69
T34 8 ADDITIONAL AIR CONDITIONER 12dN G39
T35
T36
T37
T38 		1 ADDITIONAL AIR CONDITIONER 6dL F36
T39
T40
T41 		2 PLUG BRIDGE INSTEAD RADIO BERLIN 11eK A62-63
T42
T43 		6 WH INSTRUMENT PANEL/B-PILLAR 13dL E13, N63
T44 3 WIRE HARNESS B-PILLAR/TAILGATE LOCK 13aN O63
T45 2 IGNITION FINAL STAGE/CONTROL UNIT 6dL K83-84
T46 19 DIAGNOSIS CONNECTION 11eK J30
T47 8 CODING ELEMENT FOR IGNITION SYSTEM AND LH-JETRONIC 7dL N84
T48 3 OX. SENSOR 6dL O89
T49 2 FRESH AIR BLOWER 7cL M32
T50 6 AUTOM. TRANSM., COUPLING TO GEARBOX WIRE HARNESS 16dO M22
T51 6 AUTOM. TRANSMISSION, COUPLING TO REAR WIRE HARNESS 16d0 BC85, M2
T52 6 AIRBAG 8dN M73
T53 2 AIRBAG 8dN M73

Ground Points

Component
Number 		Component Description Position in
Vehicle
MP I BODY FRONT LEFT 1cO
MP II BODY FRONT RIGHT 2cM
MP III WHEEL HOUSING WALL FRONT RIGHT 3cM
MP IV STEERING CONSOLE 8cP
MP V FIREWALL 8dM
MP VI BODY REAR 16dO
MP VII GROUND STRAP BATTERY 18dO
MP VIII ENGINE POWER 6cO
MP IX ENGINE ELECTRONICS 6cN
MP X WHEEL HOUSING LEFT OUTER 3dQ
MP XI WHEEL HOUSING RIGHT INNER 5cM
MP XII WHEEL HOUSING LEFT INNER 5cP