BMW 3 SERIES 2003 E46 Model Yar Changes

21
2001 model year changes
IHKA integrated heater and air conditioning case
The E39 IHKA case has been redesigned since 3/00. The E39 and E53 both share the
same case design.
The difference from the previous case is that a single flap (left and right), controls both the
fresh air and recirculation inlets. Ram air is controlled by a separate flap. What makes it
possible to use a single flap for fresh air/re-circ is the semi-circular door; as one inlet is cov-
ered another is opened.
Please refer to the Climate Control course material ST 054 for a complete functional description of
ram air pressure compensation.
1. Stepper motor for footwell
2. Stepper motor for rear compartment, stratification
3. Fresh air/recirculation flap
4. Output stage for blower motor
5. Stepper motor for ram air flap
6. Ram air flap
Stepper motors for the fresh air/recirculation,
defrost and ventilation flaps are located on the
left side of the housing
3
6
4
2
15
Right Side of IHKA IV Case
Ram air and fresh air/re-circ flaps as seen from the engine side of the bulkhead

22
2001 model year changes
E39 Rear Head Protection System (HPS)
For 2001, rear head protection airbags (HPS)
will be available for sedans ordered with rear
side airbags.
The airbags are a cushion (not an ITS) that is
deployed from the C-pillar. The HPS will n no
ot
t
be
de-activated along with the side airbags from
the factory since there is no danger to small
children sitting out of position.
A vehicle with rear HPS can be identified by
observing “HPS” embossed in the C-pillar
cover.
Rear airbags with HPS will be standard equipment on the 2001 E39 M5.
Review Questions
1. What addition was made to the 16 pin OBD connector that made diagnosis possible
with the DIS/MoDiC?
2. Describe the procedure to reset the Service Interval Indicator from the instrument
cluster.
3. How does the E39 IHKR system maintain the desired cabin temperature?
4. Was the “REST” feature deleted from the IHKA IV system?
5. What was the addition made to the rear airbag system of the 2001 E39?