thumb|[[Volkswagen Group|VAG car relay]]
DIN 72552 is a DIN standard for labeling the electric terminals in automotive wiring. The most frequently used labels are listed in the table below.
{| border="1" cellspacing="0" cellpadding="2"
|-
! Contact
! Meaning
! Old terminal designation
|-
! colspan="3" | Ignition system
|-
| 1
| ignition coil, distributor, low voltage
|
|-
| 1a, 1b
| distributor with two separate circuits
|
|-
| 2
| breaker points magneto ignition
|
|-
| 4
| coil, distributor, high voltage
|
|-
| 4a, 4b
| distributor with two separate circuits, high voltage
|
|-
| 7
| terminal on ballast resistor, to distributor
|
|-
| 15
| battery+ from ignition switch
| 16
|-
| 15a
| from ballast resistor to coil and starter motor
| 16
|-
|15e
|battery+ from ignition switch, also when starter motor runs
|
|-
! colspan="3" | Preheat (Diesel engines)
|-
| 15
| preheat in
| +
|-
| 17
| start
|
|-
| 19
| preheat (glow)
|
|-
! colspan="3" | Starter
|-
| 45
| starter relay
| 30f, 30h
|-
| 45a
| starter 1 output
| 30h, 30h I
|-
| 45b
| starter 2 output
| 30h II
|-
| 50
| starter control
|
|-
| 50a
| starter control
|
|-
| 50b
| starter control
| 50
|-
| 50c
| starter control
| 50 II
|-
| 50d
| starter control
| 50b, 50k
|-
| 50e
| starter control
| 50a
|-
| 50f
| starter control
| 50
|-
| 50g
| starter control
| 50a
|-
| 50h
| starter control
| 50
|-
! colspan="3" | Battery
|-
| 15
| battery+ through ignition switch
| 16, 54/15
|-
| 30
| from battery+ direct
| 30/51
|-
| 30a
| from 2nd battery and 12/24 V relay
|
|-
| 31
| return to battery- or direct to ground
|
|-
| 31a
| return to battery- 12/24 V relay
|
|-
| 31b
| return to battery- or ground through switch
| 85d
|-
| 31c
| return to battery- 12/24 V relay
| 31, 31a
|-
! colspan="3" | Electric motors
|-
| 32
| return
| 31
|-
| 33
| main terminal (swap of 32 and 33 is possible)
| 30
|-
| 33a
| limit
|
|-
| 33b
| field
| 54e
|-
| 33f
| 2. slow rpm
|
|-
| 33g
| 3. slow rpm
|
|-
| 33h
| 4. slow rpm
|
|-
| 33L
| rotation left
| 30L
|-
| 33R
| rotation right
| 30R
|-
! colspan="3" | Indicators
|-
| 49
| flasher unit in
| 15, 15+, 15/54, +, +15, X
|-
| 49a
| flasher unit out, indicator switch in
| 54L, S, S4, L
|-
| 49b
| out 2. flasher circuit
|
|-
| 49c
| 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
|-
! colspan="3" | AC generator
|-
| 51
| DC at rectifiers
|
|-
| 51e
| as 51, with choke coil
|
|-
| 59
| AC out, rectifier in, light switch
| 51, 51-, 51a
|-
| 59a
| charge, rotor out
| 59
|-
| 64
| generator control light
|
|-
! colspan="3" | Generator, voltage regulator
|-
| 61
| charge indicator (charge control light)
|
|-
| B+
| battery +
| 51, 51B+, B+30, B+51
|-
| B-
| battery -
| 31B-
|-
| D+
| dynamo/alternator diode+
|
|-
| D-
| dynamo/alternator diode-
|
|-
| DF
| dynamo field
|
|-
| DF1
| dynamo field 1
|
|-
| DF2
| dynamo field 2
|
|-
| U, V, W
| AC three phase terminals
|
|-
! colspan="3" | Lights
|-
| 54
| brake lights
|
|-
| 54g
| lights
| 54
|-
| 55
| fog light
| N
|-
| 56
| spot light
|
|-
| 56a
| headlamp high beam and indicator light
|
|-
| 56b
| low beam
|F
|-
| 56d
| signal flash
|
|-
| 57
| parking lights
|
|-
| 57a
| parking lights
| P
|-
| 57L
| parking lights left
| PL
|-
| 57R
| parking lights right
| PR
|-
| 58
| licence plate lights, instrument panel
|
|-
| 58d
| panel light dimmer
| 58b
|-
| 58L
| parking light
| 58
|-
| 58R
| parking light
| 58
|-
! colspan="3" | Window wiper/washer
|-
| 53
| wiper motor + in
| 1, 3, 54d, S
|-
| 53a
| limit stop +
| 54, +2
|-
| 53b
| limit stop field
| 3, 54e
|-
| 53c
| washer pump
|
|-
| 53e
| stop field
| 1, 2
|-
| 53i
| wiper motor with permanent magnet, third brush for high speed
|
|-
! colspan="3" | Acoustic warning
|-
| 71
| beeper in
| H
|-
| 71a
| beeper out, low
|
|-
| 71b
| beeper out, high
|
|-
| 72
| hazard lights switch
|
|-
| 85c
| hazard sound on
|
|-
! colspan="3" | Switches
|-
| 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
|
|-
! colspan="3"| Relay
|-
| 85
| relay coil -
| Important if relay coil has flyback diode in parallel
|-
| 86
| relay coil +
| Important if relay coil has diode in parallel
|-
! colspan="3" | Relay contacts
|-
| 87
| common contact
| 30/51
|-
| 87a
| normally closed contact
|
|-
| 87b
| normally open contact
|
|-
| 88
| common contact 2
| 30/51 (relay)
|-
| 88a
| normally closed contact 2
|
|-
| 88b
| normally open contact 2
|
|-
! colspan="3" | Additional
|-
| 52
| signal from trailer
|
|-
| 54g
| magnetic valves for trailer brakes
|
|-
| 75
| radio, cigarette lighter
| R
|-
| 77
| door valves control
|
|}
EN 50005
A different standard, European Norm (EN) 50005 recommends terminal numbering for general application relays (e.g. 11/12/14/A1/A2 for a SPDT relay) that may nevertheless be applied to automobiles.
References
- bosch-classic.com