Letter designation | Device, device |
A | Accumulator battery |
IN | Starter |
WITH | Generator |
D | Egnition lock |
E | Manual switch |
F | Mechanical switch |
G | Sensor, control devices |
H | Horn, two-tone horn |
J | Relay, control unit |
R, L, M, W, X | Control lamps, lamps, lamps |
N | Solenoid valves, resistors, switching devices |
ABOUT | Distributor |
P, Q | Spark plug connectors, spark plugs |
R | Radio |
S | Circuit breakers |
T | Plug connections, connectors |
W | Electric motors |
For accurate recognition, numbers are given next to the letters.
Relays and electronic control units are usually marked in gray. Lines drawn inside are internal connections. They show how relays and other electrical and electronic devices switch between themselves and with the relay board.
The number in the black square indicates the location of the relay on the fuse relay board. Directly on the marked relay is the contact designation. For example: if the terminal is marked 17/87 on the wiring diagram, then 17 is the terminal designation on the relay board 87: this is the terminal designation on the relay (control unit).
The designation of the terminals is standardized by DIN.
Terminal designations
Terminal 30. Battery voltage is always applied to this terminal. The cable is always red or red with colored streaks.
Terminal 31. Leads to ground. Ground wires are usually brown.
Terminal 15. Powered by the ignition switch. The wires conduct current only when the ignition is on. The cable is always green or green with colored veins.
Terminal X. Conducts current also only when the ignition is on, but the current is interrupted as soon as the starter is turned on. This ensures that only the ignition system is energized during start-up. All large current consumers are in this circuit. The main beam is also supplied with current from this terminal. High beam automatically switches to parking when the ignition is turned off.
On the wiring diagram on individual conductors there are numbers and combinations of letters below them. For example:
1,5
WS/ge
The numbers indicate the cross section of the conductor. The letters indicate the color of the conductor. If the designation consists of two groups of letters separated by a slash, as in the example, then the first group indicates the main color of the conductor: WS - white, the second group of letters: ge - yellow - additional color. Since it sometimes happens that the same wire colors are used for different circuits, it is recommended to control the color combination of the corresponding conductors on the connecting terminals. White wires, for distinction, are additionally equipped with a number, which in the wiring diagram is under the letter designation of the color.
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