DIN 72552 Standardisation Definition Guide
Thursday, 30 October 2014 | AdrianR
The standardisation definition guide below is presented for the identification of 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 numbering can be found on switch relays, key switches and wiper motors. In cases where a replacement base code system has been presented, the definition guide assists engineers when replacing or renewing components and wiring.
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 ignition switch. |
| 30 | From battery positive direct. |
| 30a | From 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 | Terminal on 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). |
Starter
| 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 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. |
This blog post was first created: 30th October 2014, rewritten with amendments by the author 20th July 2017.
