13
2001 model year changes
E39 IHKR
The 525i/it will be fitted with IHKR as standard
equipment. IHKA will be available as an option
on those vehicles by ordering the Convenience
package: SA 466.
IHKR is a semi-automatically regulated heating
and air-conditioning system. The components
are similar to the IHKR system used in the X5
3.0i.
The E39 IHKR is a single zone system that regulates the temperature of the cabin based
on the occupants desired temperature, selected by a temperature setting dial. Blower con-
trol, air distribution settings and stratification flap are manual.
System Components
The E39 IHKR consists of the following components:
IHKR control unit with operating controls
IHKR integrated heater and air conditioning case
1 Heater core temperature sensor
Evaporator temperature sensor
Interior temperature sensor (located in drivers footwell)
Double cage blower motor and final stage
1 Water valve (duty cycle controlled)
Auxiliary water pump
1 Fresh air/re-circ stepper motor
Auxiliary fan (DME controlled)
Refrigerant Pressure Sensor
Left and right fresh air micro-filters
16
2001 model year changes
The IHKR control module communicates with the DME via the K-Bus/KOMBI/CAN Bus
link to request permission for compressor activation. The control of the compressor
clutch is directly by the IHKA module via a final stage.
Rear Window Defroster:The rear window defroster is controlled via a request from
the button on the panel. After switching on for the first time, the rear window is heated
for 10 minutes. Output voltage to the window is provided by the K13 rear defogger
relay. After automatic switch off, if the button is pressed once again the control unit will
pro vide a clocked operation alternating at 40 seconds on and 80 seconds off. If the
vehicle voltage drops below 11.4V during this second heating operation the function is
stopped, however the LED on the button will not be extinguished. If voltage increases
past 12.2V for at least one second, clocked operation will resume. Clocked operation
continues until the button is pressed again or the ignition is cycled.
Washer Jet Heating:The IHKR provides operating current to the washer jet heaters
based on outside temperature. The washer jets are heated below an outside
temperature of 37
oF.
K-Bus Communication:The IHKR control unit is on the vehicle K-bus and receives
and sends information concerning:
Engine temperature, RPM, KL61, KL50, compressor request, auxiliary fan request,
compressor load (DME)
Outside temperature KL15 and road speed (KOMBI)
Diagnosis and coding (DIS/MoDiC)
Ventilation Flap
Stratification flap
Heater Core
Defrost Flap
Evaporator
Outlet, rear footwellOutlet, Rear compartment
Blower
Left side of IHKR case
18
2001 model year changes
E39 IHKA IV I.P.O.
E39 IHKA IV
CONTROL
PANEL/
MODULE
MAX DEFROST
DEFROST VENT A/C COMPRESSOR
FACE VENT RECIRCULATION - AUC
FOOTWELL VENT REAR DEFROST
AUTOMATIC PROGRAM
MAX COOLING/
REST HEATING
FAN SPEED
REQUEST
INDEPENDENT DRIVER
& PASSENGER SIDE
TEMPERATURE CONTROL
HEATER CORE TEMPERATURE SENSORSEVAPORATOR
TEMPERATURE
COMPRESSOR
SHUT OFF/ON
SIGNAL (KO REL)
+ +REAR
WINDOW
DE-FOGGER
RELAY
AUTO
MAX
70 F 76 F
INTERIORAIR
BLOWER
RELAYBLOWER
RELAY
KL31KL 31KL30KL 30
KL15KL 15
M-BUSM-BUS
-FA C EVENTFLAP
-DEFROST
-FOOTWELL
-FRESHAIR/RECIRCULATION
-RAMAIRFLAP
- FACE VENT FLAP
- DEFROST
- FOOTWELL
- FRESH AIR/RECIRCULATION
- RAM AIR FLAP
FIVESTEPPER
MOTORSFIVE STEPPER
MOTORS
FRESHAIRFLAP
STEPPERMOTORFRESH AIR FLAP
STEPPER MOTOR
INTERIOR AIR TEMP
PHOTO TRANSISTOR
DIAGNOSIS AND CODING
6411839142064 118391420
6411839142064 118391420
COMPRESSOR
CONTROLCOMPRESSOR
CONTROL
AUXILIARYWATERPUMPAUXILIARY WATER PUMP
AUCGAS
SENSOR
HEATERAUC GAS
SENSOR
HEATER
K-BUSK-BUS
-Coolanttemp
-
OutsideAirTemp
-
Vehiclespeed
- Coolant temp
- Outside Air Temp
- Vehicle speed-KLR
-
RecircfromMFL
-
Diagnosis
-KLR
- Recirc from MFL
- Diagnosis
LEFT
WATER
VA LV ELEFT
WATER
VA LV ERIGHT
WATER
VA LV ERIGHT
WATER
VA LV E
-+
A
M
WASHER JET HEATING
2-8VOLT
SIGNAL2-8 VOLT
SIGNAL
MM
BLOWERMOTOR
OUTPUTSTAGEBLOWER MOTOR
OUTPUT STAGE
+
BLOWER
BMWDISB
M
WD
I
SBMWDISBMWDIS
DSC III
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kjsdfkljsdfkdsfkjdsfkljsdfkjds
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K-BUS
DME
SOLAR SENSORSAUC OXIDIZABLE
GAS SENSOR
