sensor BMW 5 SERIES 2003 E39 Model Yar Changes

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

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
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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

19
2001 model year changes
Changes made to the E39 IHKA
 New Control Unit (since 9/00).
 Addition of solar sensor (since 9/00).
 New IHKA integrated heater and air conditioning case (since 3/00).
IHKA IV Control Unit
The “REST” button on the control unit has been
replaced with a “MAX” button. Two different functions
are carried out by pushing the MAX button:
 Maximum cooling function
 Residual heat function
Determination of which function will be enabled is
based on switching criteria.
A/C MAX function
(This feature was introduced in the E38 since 9/99)
Maximum cooling performance is automatically activated by pressing the MAX button. An
LED on the button illuminates to indicate that the function is active.
Criteria for operation:
Terminal 15 “on” , MAX button pressed and outside temperature above 60
oF.
The following settings are adjusted or activated:
 Temperature control is canceled and the temperature display indicates 60
o F.
 Both water valves are closed.
 The left and right Y-factors are set to -27.5%.
 The compressor is switched on (LED turns on in the A/C switch).
 The blower setting is set to maximum.
 Recirculation is activated (LED turns on in the re-circ switch).
 Air distribution is set to center vents only.
Operation of the max defrost is overridden by selecting MAX. The operation of the rear win-
dow defogger is not affected.

20
2001 model year changes
REST Function
The REST function continues to operate as usual except that the MAX button has taken the
place of the REST button. Activation criteria continues to be:
 Ignition “OFF” or in KL R.
 “MAX” button pressed.
 Outside temperature below 60
o F.
 Coolant temperature above 80o C.
 Battery voltage above 11.4V.
The REST feature operates as previously.
Diagnostics
The IHKA IV diagnosis has been upgraded to the E46 style diagnostic program.
Solar Sensor
The IHKA IV integrates the solar sensor into the
calculation used to automatically regulate the
interior vehicle temperature. The sensor is
located in the right side defrost outlet.
In the case of a very sunny day, the interior
warms faster than the control unit can compen-
sate for. Similar is true if the weather suddenly
becomes overcast.
The input of the solar sensor in the E39 can
affect the operation of:
 Blower setting
 Air distribution to center vent
Because the E39 IHKA IV is a dual zone system. the solar sensor housing contains two
photo-resistors that measure solar radiation on the left and right halves of the interior.
(Please refer to the Solar Sensor module in the 2000
Systems Diagnosis training course ST 039 for a com-
plete description of the solar sensor operation and
diagnosis)
Solar Sensor
Two photo-resistors
inside of housing