Schematic diagrams of electrical equipment on the Audi A4

general information

Before diagnosing the failure of any of the circuits, check the condition of the fuses and circuit breakers protecting it (if the latter are provided). Make sure that the battery is fully charged and check the quality of the contact connections of the wires connected to its pole terminals.

When looking for a failure of a particular circuit, first of all also check the quality of the contact connections of its electrical wiring. When disconnecting electrical connectors, try to pull only by their housings, and in no case by the wiring harness.

Wiring insulation color designation codes*

The code	Color
BLK	Black
BLU	Blue
BRN	Brown
GRN	Green
GRY	Grey
LT	Light (hue)
NCA	Any
ORG	Orange
PNK	Pink

List of abbreviations used in the notation on the diagrams

Russians

Reduction	Meaning
AT	automatic transmission
D/V	Sensor-switch
D/SWITCH	Sensor-switch
K/V	air conditioner
K/L	Pilot lamp
C/LAMP	Pilot lamp
LF	low frequency
PR-L	Fuse
RKPP	Manual gearbox
MF	midrange
heating element	Thermoelectric heating element
EM	Electromagnetic
E/MOTOR	electric motor
E/DRIVE	electric drive

latin

Reduction	Meaning
ABS	Anti-lock brake system
AIR	(System) secondary air mixing
CMP	(Sensor) camshaft position
CVT	AT variator type
DLC	Diagnostic connector
ECM	Engine control module
ECT	(Sensor) engine coolant temperature
EVAP	(System) trapping fuel vapors
GPS	(Navigational) global positioning system
IAC	(System) idle speed stabilization
IAT	(Sensor) intake air temperature
KS	Knock sensor
LDP	Leak detection pump
MAF	(Meter) mass air flow
MAP	Absolute pressure in the inlet pipeline
MIL	(Control lamp) failures ("Check engine")
MOTRONIC	(System) fuel injection control
PNP	(sensor-switch) start permission
SERVOTRONIC	Power steering with speed-dependent gain
SRS	Additional security system (airbags, emergency seat belt tensioners)
TCM	AT control module
TELEMATIC	Emergency call system
TIPTRONIC	A device that provides the possibility of manual, forced gear shifting AT
TPS	Throttle position sensor
VSS	Vehicle speed sensor