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Home >> BMW >> 2004 >> 745Li >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating And Air Conditioning - Service Information >> Integrated Automatic Heating/Air-Conditioning System (IHKA), Basic And High E60, E61, E63, E64 >> Brief Description Of Components >> Control Unit: >> IHKA Controls/Control Unit >> Layout And Pin Assignment For IHKA Basic
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Layout And Pin Assignment For IHKA Basic

Fig 1: Identifying Control Panel IHKA Basic
G00431727Courtesy of BMW OF NORTH AMERICA, INC.

Pin Assignment For Connector X18793, 18-Pin Black 

PIN ASSIGNMENT FOR IHKA BASIC CONNECTOR X18793, 18-PIN BLACK

Pin Type Description
1 E/A LIN bus, data
2 - -
3 E Signal from refrigerant pressure sensor
4 V Terminal 15, power supply for refrigerant pressure sensor
5 - -
6 E/A CAN-bus high
7 E/A CAN-bus low
8 M Earth for refrigerant pressure sensor
9 - -
10 V Terminal 30, power supply
11 A Control valve in A/C compressor
12 A Water valve
13 A Auxiliary water pump
14 A Relay for heated rear window
15 A Heated washer jets
16 E PWM signal from DDE for electric auxiliary heater
17 - -
18 M Earth point, terminal 31
A = Output
E = Input
E/A = Input and output
M = Earth
V = Supply
For current specifications regarding pin assignments, please refer to BMW diagnosis system
PIN ASSIGNMENT FOR IHKA BASIC CONNECTOR X01130, 12-PIN BLACK

Pin Type Description
1 E Signal from heating system heat exchanger sensor
2 - -
3 E Signal from evaporator temperature sensor
4 - -
5 - -
6 M Earth point for sensors
7 A PWM signal to electric auxiliary heater
8 - -
9 - -
10 V LIN bus, supply
11 E/A N bus, data
12 M LIN bus, earth
A = Output
E = Input
E/A = Input and output
M = Earth
V = Supply
For current specifications regarding pin assignments, please refer to BMW diagnosis system