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Home >> BMW >> 2004 >> 545i Automatic >> 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 High
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Layout And Pin Assignment For IHKA High

Fig 1: Identifying Control Panel IHKA High
G00431728Courtesy of BMW OF NORTH AMERICA, INC.
PIN ASSIGNMENT FOR IHKA HIGH CONNECTOR X13765, 2-PIN BLACK

Pin Type Description
1 V Terminal 30, power supply
2 M Terminal 31, earth
M = Earth
V = Supply
For current specifications regarding pin assignments, please refer to BMW diagnosis system
PIN ASSIGNMENT FOR IHKA HIGH CONNECTOR X01130, 12-PIN BLACK

Pin Type Description
1 E Signal from left-hand heating system heat exchanger sensor
2 E Signal from right-hand heating system heat exchanger sensor
3 E Signal from evaporator temperature sensor
4 - -
5 - -
6 E/A Earth point for sensors
7 A PWM signal to electric auxiliary heater
8 - -
9 - -
10 V LIN bus, supply
11 E/A LIN 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
PIN ASSIGNMENT FOR IHKA HIGH CONNECTOR X1527, 26-PIN BLUE

Pin Type Description
1 E/A LIN bus, data
2 V AUC sensor, supply
3 E Signal from AUC sensor
4 V Condensation sensor, power supply
5 E Signal from condensation sensor
6 E/A CAN-bus high
7 E/A CAN-bus low
8 V Refrigerant pressure sensor, supply
9 E Signal from refrigerant pressure sensor
10 V Solar sensor, power supply
11 E Solar sensor, left signal (E63/E64 right signal)
12 E Solar sensor, right signal (E63/E64 left signal)
13 M Solar sensor, earth
14 E PWM signal from DDE for electric auxiliary heater
15 A Control valve in A/C compressor
16 E Dual water valve, left
17 E Dual water valve, right
18 A Auxiliary water pump
19 A Relay for heated rear window
20 A Heated washer jets
21 M Refrigerant pressure sensor, earth
22 V Rear stratification flap, power supply (not E63)
23 E Signal from rear stratification flap (not E63)
24 E Signal from ventilation temperature sensor
25 M Earth point for AUC, ventilation temperature and condensation sensor
26 M Rear stratification control
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