14
2001 model year changes
E39 IHKR I.P.O.
-+
HEATERCORE
TEMPERATUREHEATER CORE
TEMPERATURE
DME
KL31
KL30
KL15
FAN SPEED
A/C REQUEST
RECIRCULATION
REAR DEFROST
TEMPERATURE
CONTROL
EVAPORATOR
TEMPERATUREWASHER JET HEATER
BLOWER MOTOR OUTPUT STAGE
REAR WINDOW DEFROST RELAYWATER VALVE
FRESH AIR/RECIRC MOTOR
E39
IHKR
REFRIGERANT PRESSURE
0
45
80 72
TEMP
INTERIOR TEMPERATURE
(FOOTWELL)
LCM58G
K-BUS
KOREL
+M
COMPRESSORCONTROLCOMPRESSOR CONTROL
KL 30
KL 15
BMWDISBMW
DISBMWDISB
M
WD
I
S
DSC III
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K-BUS
M
AUXILIARY WATER PUMP
COMPRESSOR
SHUT OFF/ON
SIGNAL
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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K-BUS
DME
SOLAR SENSORSAUC OXIDIZABLE
GAS SENSOR
