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DIN 72552 Standardisation Definition Guide

  The standardisation definition guide below is presented for identifying contact terminal configurations, specifically on automotive electrical components available at Arc Components Limited. DIN 72552 is used by most high-end component and vehicle manufacturers when creating an automotive circuit, and the DIN standardisation guide identifies the terminal connection on automotive electrical parts. Examples of Pin-in and Pin-out DIN numbering can be found on Switch Relays, Key switches, Wiper motors, etc. This definition guide will assist engineers when replacing or renewing components and wiring, where a DIN code number system has been presented.

  The guide is presented with terminal identification first, followed by designation.


Relay Coil - Positive and Negative Coil Energising.

Terminal or Contact Identification
85 Relay coil - Negative.
86 Relay coil  - Positive.


Relay Contacts - Line Feed or Switching.

Terminal or Contact Identification
87 Common contact.
87a Normally Closed contact.
87b Normally Open contact.
88 Common contact 2.
88a Normally Closed contact 2.
88b Normally Open contact 2.


Battery Circuit.

Terminal or Contact Identification
15 Battery Positive through the ignition switch.
30 From battery Positive direct.
30a From the 2nd battery and 12-24V relay.
31 Return to battery Negative or direct to ground.
31a Return to battery Negative 12-24V relay.
31b Return to battery Negative or ground through a switch.
31c Return to battery Negative 12-24V relay.


Ignition System

Terminal or Contact Identification
1 Ignition coil, low voltage, distributor.
1a, 1b Distributor - two separate circuits.
2 breaker points magneto ignition.
4 Coil, distributor high voltage.
4a, 4b Distributor - two separate circuits, high voltage.
7 The terminal on the ballast resistor, to the distributor.
15 Battery Positive from the ignition switch.
15a From ballast resistor to coil and starter motor.


Preheat - Diesel Engine

Terminal or Contact Identification
15 Preheat in.
17 Start
19 Preheat (glow).



Terminal or Contact Identification
50 Starter control.


Electric Motor - Terminals

Terminal or Contact Identification
32 Return.
33 Main terminal (swap designation of 32 and 33 possible in application).
33a Limit
33b Motor field.
33f 2. slow rpm.
33g 3. slow rpm.
33h 4. slow rpm.
33L Rotation left.
33R Rotation right.


AC Generator

Terminal or Contact Identification
51 DC at rectifiers.
51e As 51, with choke coil.
59 AC out, rectifier in, light switch.
59a Charge, rotor out.
64 Generator control light.


Generator - Voltage Regulator

Terminal or Contact Identification
61 Charge indicator (charge control light).
B+ Battery Positive.
B- Battery Negative.
D+ Dynamo or alternator diode Positive.
D- Dynamo or alternator diode Negative.
DF Dynamo field.
DF1 Dynamo field 1.
DF2 Dynamo field 2.
U, V, W AC three-phase terminals.


Lighting Circuit

Terminal or Contact Identification
54 Brake lights.
55 Fog light.
56 Spotlight.
56a headlamp high beam and indicator light.
56b Low beam.
56d Signal flash.
57 Parking lights.
57a Parking lights.
57L Parking lights left side.
57R Parking lights right side.
58 licence or number plate lights, instrument panel.
58d Panel light dimmer.


Turn Indicators

Terminal or Contact Identification
49 Flasher unit in.
49a Flasher unit out, indicator switch in.
49b Out 2. flasher circuit.
49c Out 3. flasher circuit.
C 1st flasher indicator light.
C2 2nd flasher indicator light.
C3 3rd flasher indicator light.
L Indicator lights left side.
R Indicator lights right side.
L54 Lights out, left side.
R54 Lights out, right side.


Window Wiper and Washer Circuit

Terminal or Contact Identification
53 Wiper motor Positive in.
53a Limit stop Positive.
53b Limit stop field.
53c Washer pump.
53e Stop field.
53i Wiper motor with a permanent magnet, third brush for high speed.


Switches Circuit

Terminal or Contact Identification
81 Opener.
81a 1 out.
81b 2 out.
82 Lock in.
82a 1st out.
82b 2nd out.
82z 1st in.
82y 2nd in.
83 Multi-position switch, in.
83a Out position 1.
83b Out position 2.


Acoustic Warning

Terminal or Contact Identification
71 Beeper in.
71a Beeper out, low.
71b Beeper out, high.
72 Hazard light switch.
85c Hazard sound on.


Additional Circuit Functions

Terminal or Contact Identification
52 Signal from the trailer.
54g Magnetic valves for trailer brakes.
75 Radio, cigarette lighter.
77 Door valves control.


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