cooling BMW 3 SERIES 2003 E46 Model Yar Changes

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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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

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.