Control Module HVAC

Climatronic Control Module -J255-, Multi-pin Connector Assignments







12-pin multi-connector -A-(black -T12/-)

1 Data Link Connector (DLC) K-wire
2 Motronic Engine Control Module -J220- (idle speed control)
3 A/C readiness
4 Open
5 Terminal 58d (instrument illumination - dimmer)
7 Fresh air intake duct temperature sensor -G89-
8 Outside air temperature sensor -G17-
9 Ground signal (sensors - motors)
10 Open
11 Engine Coolant Temperature (ECT) warning lamp (where applicable*)
12 Ground signal (sensors - motors)

20-pin multi-connector housing -B-(red -T20/-)

1 Outside temperature signal from instrument cluster (where applicable*)
2 CAN Bus - high (where applicable*)
3 CAN Bus - low (where applicable*)
4 CAN Bus - shielding (where applicable*)
5 Sender for outlet temperature, floor outlet -G192-
6 Sender for outlet temperature, center -G191-
7 Evaporator vent temperature sensor -G263-
8 Temperature regulator flap motor position sensor -G92-
9 Central flap motor position sensor -G112-
10 Footwell/Defrost flap motor position sensor -G114-
13 Standing time - instrument cluster (where applicable*)
14 Temperature increase off/PTC off (P/N 3B1/2 907 044 F only - where applicable*)
15 Engine Coolant Shutoff Two-Way Vacuum Valve Relay -J585-(where applicable*)
17 Back pressure flap motor position sensor -G113-
18 Sunlight photo sensor -G107-

*) Confirm using applicable wiring diagram


16-pin multi-connector housing -C- (brown -T16b/-)

1 Kickdown (where applicable*)
2 A/C pressure switch -F129- pin 2 (diagnosis 2/32 bar - high pressure side)
3 Compressor voltage (where applicable*)
4 Speedometer signal (where applicable*)
5 Open
6 Engine Speed (RPM) signal (where applicable*)
7 Terminal 58 (instrument illumination) (where applicable*)
8 Reference voltage 5 V (10 mA) for flap motors
9 Fresh air blower control signal (-)
10 - 11 Open
12 Motronic Engine Control Module (ECM) (engine electronics - bidirectional)
13 Open
14 Fresh air blower control signal (+)
15 Wiring control (internal)
16 Control module for fresh air blower -J126-

*) Confirm using applicable wiring diagram

16-pin multi- connector -D- (black -T16a/-)

1 Open
2 Temperature regulator flap motor -V68-
3 Footwell/Defroster flap -V85-
4 Central air flap motor -V70-
5 Air flow flap motor -V71-
6 A/C Clutch relay -J44- or A/C Compressor Regulator Valve -N280- (where applicable*)
7 Terminal 30 (where applicable*)
8 A/C Clutch relay -J44- (where applicable*)
9 Terminal 15
10 Temperature regulator flap motor -V68-
11 Footwell/Defroster flap motor -V85-
12 Central air flap motor -V70-
13 Air flow flap motor -V71-
14 Terminal 31 (Ground - where applicable*)
15 Terminal 31 (Ground)
16 Coolant (FC) Fan Control Control Module -J293- or First Speed Engine Coolant Fan Control (FC) relay -J279- (where applicable**)

*) Confirm using applicable wiring diagram
**) Engine dependant - confirm using applicable wiring diagram