Similar to the KL15, KL30 etc. wiring codes in Automotive Wiring, Automotive relays have their own nomenclature. Automotive OEMs (manufacturers) such as Citroen, Jaguar Land Rover, Ford and others (I don’t know if Tesla does as well, but I suspect not) use automotive relays. The labelling of which utilises the DIN 72552 convention for labelling the electric terminals in automotive wiring.
Small Automotive Relays
This is the pin out for a 1 Form C relay. (1 Form A, and 1 Form B relays have terminals 87a or 87b de-populated).
- 85 – relay coil -Ve
- 86 – relay coil +Ve
- 87 – common contact
- 87a – normally closed contact
- 87b – normally open contact
If the relay has a second set of contacts; such as a 2 Form C relay. (2 Form A and 2 Form B relays have terminals 88a or 88b de-populated).
- 88a – normally closed contact 2
- 88b – normally open contact 2
Din 72552
Din 72552 covers more than just the terminals of relays, some of the most common labels are listed below:
| Contact | Meaning | Notes | Old terminal designation |
|---|---|---|---|
| Ignition System | |||
| KL1 | ignition coil, distributor, low voltage | ||
| KL1a, 1b | distributor with two separate circuits | ||
| KL2 | breaker points magneto ignition | ||
| KL4 | coil, distributor, high voltage | ||
| KL4a, 4b | distributor with two separate circuits, high voltage | ||
| KL7 | the terminal on the ballast resistor, to the distributor | ||
| KL15 | battery+ from the ignition switch | See also In Automotive Wiring, What is KL? | 16 |
| KL15a | from ballast resistor to coil and starter motor | 16 | |
| KL15e | battery+ from the ignition switch, also when the starter motor runs | ||
| Preheat (Diesel engines) | |||
| KL15 | preheat in | + | |
| KL17 | start | ||
| KL19 | pre-heat (glow) | ||
| Starter | |||
| KL45 | starter relay | 30f, 30h | |
| KL45a | starter 1 output | 30h, 30h I | |
| KL45b | starter 2 output | 30h II | |
| KL50 | starter control | ||
| KL50a | starter control | ||
| KL50b | starter control | 50 | |
| KL50c | starter control | 50 II | |
| KL50d | starter control | 50b, 50k | |
| KL50e | starter control | 50a | |
| KL50f | starter control | 50 | |
| KL50g | starter control | 50a | |
| KL50h | starter control | 50 | |
| Battery | |||
| KL15 | battery +Ve through the ignition switch | See also In Automotive Wiring, What is KL? | 16, 54/15 |
| KL30 | from battery +Ve direct | See also In Automotive Wiring, What is KL? | 30/51 |
| KL30a | from 2nd battery and 12/24 V relay | ||
| KL31 | return to the battery -Ve or direct to ground | See also In Automotive Wiring, What is KL? | |
| KL31a | return to the battery -Ve 12/24 V relay | ||
| KL31b | return to the battery -Ve or ground through switch | 85d | |
| KL31c | return to the battery -Ve 12/24 V relay | 31, 31a | |
| Electric motors | |||
| KL32 | return | 31 | |
| KL33 | main terminal (swap of 32 and 33 is possible) | 30 | |
| KL33a | limit | ||
| KL33b | field | 54e | |
| KL33f | 2. slow rpm | ||
| KL33g | 3. slow rpm | ||
| KL33h | 4. slow rpm | ||
| KL33L | rotation left | 30L | |
| KL33R | rotation right | 30R | |
| Indicators | |||
| KL49 | flasher unit in | 15, 15+, 15/54, +, +15 | |
| KL49a | flasher unit out, indicator switch in | 54L, S, S4 | |
| KL49b | out 2. flasher circuit | ||
| KL49c | out 3. flasher circuit | ||
| C | 1st flasher indicator light | K, K1, P | |
| C2 | 2nd flasher indicator light | K1, K2, K3, K4 | |
| C3 | 3rd flasher indicator light | K3, K4 | |
| L | indicator lights left | HL, L54, VL | |
| R | indicator lights right | HR, R54, VR | |
| L54 | lights out, left | SBL | |
| R54 | lights out right | SBR | |
| AC generator | |||
| KL51 | DC at rectifiers | ||
| KL51e | as KL51, with a choke coil | ||
| KL59 | AC out, rectifier in, light switch | 51, 51-, 51a | |
| KL59a | charge, rotor out | 59 | |
| Generator, Voltage regulator | |||
| KL61 | charge indicator (charge control light) | ||
| B+ | battery +Ve | 51, 51B+, B+30, B+51 | |
| B- | battery -Ve | 31- | |
| D+ | dynamo/alternator diode +Ve | ||
| D- | dynamo/alternator diode -Ve | ||
| DF | dynamo field | ||
| DF1 | dynamo field 1 | ||
| DF2 | dynamo field 2 | ||
| U, V, W | AC three-phase terminals | ||
| Lights | |||
| KL54 | brake lights | ||
| KL54g | lights | 54 | |
| KL55 | fog light | N | |
| KL56 | spotlight | ||
| KL56a | headlight high beam and indicator light | ||
| KL56b | low beam | F | |
| KL56d | signal flash | ||
| KL57 | parking lights | ||
| KL57a | parking lights | P | |
| KL57L | parking lights left | PL | |
| KL57R | parking lights right | PR | |
| KL58 | licence plate lights, instrument panel | ||
| KL58d | panel light dimmer | 58b | |
| KL58L | parking light | 58 | |
| KL58R | parking light | 58 | |
| Window wiper/washer | |||
| KL53 | wiper motor +Ve in | 1, 3, 54d, S | |
| KL53a | limit stop +Ve | 54, +2 | |
| KL53b | limit stop field | 3, 54e | |
| KL53c | washer pump | ||
| KL53e | stop field | 1, 2 | |
| KL53i | wiper motor with a permanent magnet, third brush for high speed | ||
| Acoustic warning | |||
| KL71 | beeper in | H | |
| KL71a | beeper out, low | ||
| KL71b | beeper out, high | ||
| KL72 | hazard lights switch | ||
| KL85c | hazard sound on | ||
| Switches | |||
| KL81 | opener | ||
| KL81a | 1 out | ||
| KL81b | 2 out | ||
| KL82 | lock in | ||
| KL82a | 1st out | ||
| KL82b | 2nd out | ||
| KL82z | 1st in | ||
| KL82y | 2nd in | ||
| KL83 | multi position switch in | ||
| KL83a | out position 1 | ||
| KL83b | out position 2 | ||
| Relay | |||
| KL85 | relay coil -Ve | important if the relay coil has a flyback diode in parallel | |
| KL86 | relay coul +Ve | important if the relay coil has a flyback diode in parallel | |
| Relay contacts | |||
| KL87 | common contact | 30/51 | |
| KL87a | normally closed contact | ||
| KL87b | normally open contact | ||
| 88 | common contact 2 | 30/51 (relay) | |
| 88a | normally closed contact 2 | ||
| 88b | normally open contact 2 | ||
| Additional | |||
| KL52 | signal from trailer | ||
| KL54g | magnetic valves for trailer brakes | ||
| KL75 | radio, cigarette lighter | R | |
| KL77 | door valves control | ||
