Abbreviations of Signal and Circuit Designations

Abbreviation Designation
(+) Plus
(-) Negative
15 Switched positive
15 V-E Circuit 15 voltage, feed
15R Switched positive, in ignition position 1, 2 & 3
15X Switched positive, in ignition position 2
30 Battery voltage, positive (continuous positive)
30 FH li Left power window circuit 30
30 FH re Right power window circuit 30
30 V-E Circuit 30 voltage, feed
31 Return lead to battery negative of ground, direct
31 FH li Left power window ground
31 FH re Right power window ground
31 V-E Feed ground
31b Return lead to battery negative or ground through switch or relay, switched negative
49 Turn signal pulse generator input
49a Turn signal pulse generator output
49L Left turn signal lamp
49R Right turn signal lamp
50 Starter control (direct)
53 Wiper motor, input (+)
53b Wiper (shunt)
54 Stop lamp
55 Fog lamp
56 Headlamp
56a Main beam and main beam indicator
56b Low beam
58 Clearance, tail, license plate and instrument lamps
58d Variable instrument / switch illumination
61 Generator indicator
85 Winding end negative or ground
86 Winding start
87 Input
87a First output (NC side)
87b Second output
87c Third output
ABBF - Passenger airbag -
ABBF + Passenger airbag +
ABFA - Driver airbag -
ABFA + Driver airbag +
AE Trailer recognition
AF Audio frequency
AF-L Audio frequency, left channel
AF-R Audio frequency, right channel
AKSE (ACSR) Front passenger seat occupied recognition with automatic child seat recognition (ACSR)
AM Amplitude modulated frequency
AS Towing sensor
AS/HL Left up window drive
AS/HR Right up window drive
AS/RL Left down window drive
AS/RR Right down window drive
ASR-OFF ASR-OFF switch
ASS/IRS Towing sensor/ interior motion sensor
Autom. Ant. Automatic antenna
Ay - Transverse acceleration -
Ay + Transverse acceleration +
B Video signal, blue
B - Battery negative
B + Battery positive
B33 Alarm ATA ALARM tilt sensor
B33 Off ATA OFF tilt sensor
B33 On ATA ON tilt sensor
BBVHL Rear left brake pad wear
BBVHR Rear right brake pad wear
BBVVL Front left brake pad wear
BBVVR Front right brake pad wear
BF Front passenger
BLS Stop lamp switch NO contact
BS Stop lamp switch NC contact
CAN (H) CAN (high)
CAN (L) CAN (low)
CD Compact disc
CDW Bus CD changer bus
CDW Masse CD changer ground
CDW Steuerung CD changer control
CDW Versorg. CD changer power supply
D - Generator, negative
D + Generator, positive
D2B IN D2 BUS, input
D2B OUT D2 BUS, output
DBE Roof control panel
DF Generator field
DFA-HL Left rear speed sensor output
DFA-HR Right rear speed sensor output
DFA-VL Left front speed sensor output
DFA-VR Right front speed sensor output
DFHL Left rear speed sensor
DFHR Right rear speed sensor
DFVL Left front speed sensor
DFVR Right front speed sensor
DG + 5 V Pressure sensor voltage supply
DG - Signal Pressure sensor signal
Diag. Diagnosis
E. B/A Soft top bow open limit switch
E. B/U Soft top bow down limit switch
E. B/V Soft top bow locked limit switch
E. D/A Cover open limit switch
E. D/V Cover locked limit switch
E. D/Z Cover closed limit switch
E. R/Z Sun blind closed limit switch
E. U/O Rollover bar up limit switch
E. U/U Rollover bar down limit switch
E. V/A Soft top open limit switch
E. V/V Soft top locked limit switch
E. V/Z Soft top closed limit switch
EDW D ATA data
EDW M Ground
EDW-ZA ATA status display
FBS Parking brake
FM Frequency modulation
FSA - Handsfree system -
FSA + Handsfree system +
G Video signal, green
GAL Speed-responsive volume control
GPS-Ant. Global positioning system antenna
GS Emergency tensioning retractor
HFE Remote trunk lid release
HHS Rear window defroster
HL AV Left rear pressure reduction solenoid valve
HL EV Left rear pressure holding solenoid valve
HR AV Right rear pressure reduction solenoid valve
HR EV Right rear pressure holding solenoid valve
IP1S Actual value potentiometer 1
IP2S Actual value potentiometer 2
IPA Actual value potentiometer drive
IPDK Actual value potentiometer throttle valve
K. T/B Air conditioning temperature switch changeover
K. T/M Air conditioning temperature switch changeover ground
L. U/B Rollover bar operating switch indicator lamp
L. V Soft top operating switch indicator lamp
L/R Left/right
LW Steering angle
M. B/A Soft top bow open solenoid valve
M. B/Z Soft top bow closed solenoid valve
M. D/A Cover open solenoid valve
M. MU Deployment solenoid
M. U/H Rollover bar up solenoid valve
M. V/A Soft top open solenoid valve
M. V/BA Soft top bow lock open solenoid valve
M. V/DA Cover lock open solenoid valve
M. V/Z Soft top closed solenoid valve
MBBVVR Right front brake pad wear ground
MDFHL Left rear speed sensor ground
MDFHR Right rear speed sensor ground
MDFVL Left front speed sensor ground
MDFVR Right front speed sensor ground
Mikr. - Microphone negative
Mikr. + Microphone positive
MRA Solenoid valve actuation relay
MRU Solenoid valve voltage supply relay
MV + Solenoid valve positive
NC not connected
NF Low frequency
NF li Left low frequency
NF re Right low frequency
NSL-LL LHS rear fog lamp
NSL-RL RHS rear fog lamp
P. M Pump relay / solenoid valve rollover bow down
Poti (+) Potentiometer (positive)
Poti (-) Potentiometer (negative)
R Video signal, red
Rue. Backup lamp
RW Residual heat supply
S. MW Service ground signal
S.T/P Pump temperature signal
S. T/PM Pump temperature ground signal
SAB Side airbag
SBE Seat occupied recognition
Sig. Signal
SN Lock switch
SN-HD Trunk lid lock switch (voltage-coded)
SN1 Unlocking signal
SN2 Locking signal
SRS Locking signal
SYNC Synchronization
T. S/VL Left front window pushbutton
T. S/VR Right front window pushbutton
T. U/H Rollover bar up pushbutton
T. U/R Rollover bar down pushbutton
T. V/A Soft top open pushbutton
T. V/Z Soft top close pushbutton
Temp - Temperature negative
Temp + Temperature positive
TK Door contact
TKBFT Front passenger door contact
TKFT Driver door contact
TKHT Rear door and tailgate contact
U87 Circuit 87 voltage supply
UB Operation voltage
UMRFP Return pump monitor
USP1 Potentiometer 1 set value voltage supply
USP2 Potentiometer 2 set value voltage supply
USV 1 (VA) Switchover solenoid valve 1
USV 2 (VA) Switchover solenoid valve 2
VL V1 (VA) Front axle pressure increase solenoid valve
VL V2 (VA) Rear axle pressure increase solenoid valve
VLP - Charging pump (negative)
VLP + Charging pump (positive)
vo.li. - Left front negative
vo.li. + Left front positive
vo.re. + Right front positive
vo.re. - Right front negative
VR AV Right front reduce pressure solenoid valve
VR AV Right front pressure reduction solenoid valve
VR EV Right front hold pressure solenoid valve
VR EV Right front pressure holding solenoid valve
W/S Winter / summer program selector
Wake-up Wake-up signal (D2 bus)