four wheel drive BMW Z4 ROADSTER 2.5I 2004 E85 Owner's Manual

Driving
40 direction, the transmission shifts up. When
the lever is tapped in the – direction, the
transmission shifts down. M1 to M 5 appear
in the gear indicator.
The Adaptive Transmission Control ATC
executes upshifts or downshifts only when
the new gear will provide a suitable combi-
nation of engine and road speed, e.g. ATC
will not execute downshifts if the engine
speed is too high. The desired gear will
appear briefly in the instrument cluster, fol-
lowed by the actual gear.
If you are driving in the manual mode
and wish to accelerate rapidly, e.g. to
pass another vehicle, shift down manually
or with the kickdown function.<
Shifting from M/S to selector lever posi-
tions P, R and N is possible only by going
through position D.
Available indicators
P R N D SD M1 M2 M3 M4 M5
Malfunction
If the indicator lamp comes on,
there is a malfunction in the trans-
mission system.
All of the selector lever positions can con-
tinue to be engaged; in the forward drive
positions, however, the vehicle will be
operating in the fourth gear only.
If this happens, avoid extreme engine loads
and consult the nearest BMW center.
Never work in the engine compart-
ment when a drive gear – forward or
reverse – is engaged. If you do so, the vehi-
cle could move. information beginning on page 94.
Sequential manual gearbox
SMG*
The concept
The sequential manual gearbox SMG is an
automated manual gearbox with which
clutching and shifting is assumed by an
electro-hydraulic system.
The SMG is operated via two shift paddles
on the steering wheel and the selector lever
in the center console.
It offers the following functions:
>Sequential mode: manual mode
>Drive mode: automated mode
>Ability to choose between two different
driving programs: Standard, Sport,
refer to Dynamic Driving Control
>Operating safety through protection
against misshifting
>Automatic upshifts and downshifts in
the drive mode
>Automatic downshifts at minimum
engine rpm
>Kickdown function in the drive mode
>Acceleration assistant.
Selector lever positions
The current selector lever position is shown
by a light-emitting diode on the center con-
sole.
R: Reverse
N: Neutral

Technology for safety and driving convenience
54 The display has two levels:
>Normal braking:
Brake lamp 1 lights up on both sides of
the vehicle together with the center
brake lamp
>Forceful braking and braking with ABS:
Brake lamps 1 and 2 light up on both
vehicle sides together with the center
brake lamp.
Antilock Brake System ABS
The concept
ABS keeps the wheels from locking during
braking, thereby enhancing active driving
safety.
Malfunctions
If the yellow indicator lamp for the
Antilock Brake System ABS comes
on together with the brake warning
lamp and the indicator lamp for the
Dynamic Stability Control DSC:
The entire ABS and DSC control
system has failed. Continue driving
cautiously and defensively. Avoid
hard brake applications. Please have the
system checked by your BMW center as
soon as possible.
Indicator lamp for the Antilock
Brake System ABS with the brake
warning lamp and the indicator
lamp for the Dynamic Stability Con-
trol DSC for Canadian models.
Braking with ABS
If you are in a situation which requires full
braking, you will exploit the full benefits of
the ABS system if you apply maximum
brake pressure: panic stop.
Pulsation at the brake pedal combines with
sounds from the hydraulic circuits to indi-
cate to the driver that ABS is in its active
mode.
Flat Tire Monitor
The concept
As you drive, the Flat Tire Monitor keeps
track of pressure levels in all four tires. The
system alerts you whenever the inflation
pressure of a tire falls significantly below
the pressure of another tire.
The system actually detects pressure loss
by monitoring differences in the relative
speeds of the four wheels. It interprets vari-
ations outside specified limits as severe
pressure loss, and then responds by gen-
erating a warning.
System requirements
In order for the Flat Tire Monitor to learn the
correct tire inflation pressure, please do the
following:
1.Check the tire inflation pressures in all
tires
2.Compare to the inflation pressure table,
refer to page 76, and correct if neces-
sary
3.Initialize the system.
If the system is not initialized,
undetected losses in pressure or
false warnings that indicate a non-exis-
tent flat tire are possible.<
System limitations
The Flat Tire Monitor cannot provide
you with advance warning of sudden
and severe tire damage caused by external
factors and does not detect the balanced
and very gradual pressure loss that takes

Reference
At a glance
Controls
Driving tips
Mobility
55
place in all four tires over an extended
period of time.<
On the other hand, the following situations
can lead to false warning, a delayed detec-
tion of pressure loss and even to the sys-
tem not functioning:
>Driving on snow-covered or slippery
roads
>Performance-oriented driving: slip at
the drive wheels, high levels of lateral
acceleration
>When driving with snow chains, false
warnings and undetected pressure
losses may occur
>If the Flat Tire Monitor was not initial-
ized after the last time the tire inflation
pressures were corrected, undetected
losses in pressure or false warnings
that indicate a non-existent flat tire are
possible.
Initializing the system
Each time you correct the pressure in
a tire, or change a wheel or tire, reini-
tialize the system immediately afterwards.
This requires driving.<
1.Start the engine, but do not drive off
2.Press the button as long as you need to
until the yellow indicator lamp in the
instrument cluster lights up for a few
seconds
3.Drive off.
It takes a few minutes before the Flat Tire
Monitor can detect a flat tire and issue a
warning.
When driving with snow chains, do
not initialize the system.<
Flat tire warning
The indicator lamp in the instrument
cluster lights up in red. This visual
alert is accompanied by an acoustic
warning signal. There is a flat tire or a sign-
ficant loss of tire pressure.
1.Carefully reduce your speed to under
50 mph / 80 km/h. Avoid strong braking
and steering maneuvers. Do not exceed
a maximum speed of 50 mph / 80 km/h.
2.Check the inflation pressure in all four
tires as soon as possible.
Because the sides of Run Flat
tires are reinforced, a drop in infla-
tion pressure usually cannot be
detected from the outside, refer to Run
Flat tires on page 80.<
3.Before continuing to drive, refer to the
notes on page 80.
If the vehicle is not equipped with Run
Flat tires, refer to page 80, the stan-
dard equipment by design, continuing to
drive with a flat tire can result in serious
accidents.<
System malfunction
The indicator lamp in the instrument
cluster lights up yellow. The Flat
Tire Monitor is malfunctioning or out
of order. Please refer the problem to your
BMW center.