BMW Z4 ROADSTER 2.5I 2005 E85 Service Manual

Reference
At a glance
Controls
Driving tips
Mobility
39
A detent prevents inadvertent shifting into
selector lever positions R and P. To disengage
the detent, press the button on the front of the
selector lever knob, see arrow.
PPark
Select only when the vehicle is stationary. The
transmission locks to prevent the rear wheels
from turning.
R Reverse
Select only when the vehicle is stationary.
NNeutral
Select this, for example, in car washes. The
vehicle can roll.
D Drive, automatic shift program
This position is designed for driving under all
normal operating conditions. All forward gears
are available.
Kickdown
With kickdown, you achieve maximum acceler-
ating performance.
Depress the accelerator pedal past the
increased resistance point at the full-throttle
position.
M/S Manual mode and Sport program
Move the selector lever from position D to the
left into the M/S range:
The Sport program is activated. This is indi-
cated by the display SD in the instrument clus-
ter. This position is recommended for perfor-
mance-oriented driving. The Sport program is
enabled automatically when the Driving
Dynamic Control system is activated, refer to
page41.
Steptronic enters the manual selection mode
and executes the desired shift whenever you
tap the selector lever in the direction indicated
by + or –. M1 to M 5 appear in the instrument
cluster.
The transmission will only execute upshifts and
downshifts that will result in an appropriate
combination of vehicle speed and engine rpm.
For instance, downshifts that would result in
excessive engine speed will not be executed.
The desired gear will appear briefly in the
instrument cluster, followed by the actual gear.
To use the automatic transmission mode again,
move the selector lever to the right to position
D.
Malfunction
The warning lamp lights up. The trans-
mission system is malfunctioning.
Avoid heavy loads.
All of the selector lever positions can continue
to be engaged; in the forward drive positions,
however, the vehicle will be operating in a
restricted gear range only. Have the system
checked immediately.
Towing and jump starting beginning with
page97.

Driving
40
Sequential manual gearbox
SMG*
The concept
The sequential manual gearbox SMG is an
automated manual gearbox with which clutch-
ing 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:
>Optionally manual or automatic operation:
sequential mode or drive mode
>Ability to choose between two different
driving programs: standard or Sport, refer to
page41
>Protection against misshifting, and auto-
matic downshifting at minimum engine rpm
even in sequential mode
>Kickdown function in the drive mode
>Acceleration assistant, refer to page42.
The SMG is ready for operation when the igni-
tion key is in position 2.
Selector lever positions
You can see the current selector lever position
in the center console.
>R: Reverse
>N: Neutral
>One-touch functions for the sequential
mode
+: manual upshifting
–: manual downshifting>D: Drive mode.
N is automatically selected if the driver's
door is opened while the engine is run-
ning and the driver does not actuate the pedals,
the shift paddles or the selector lever.
This is accompanied by an acoustic signal and a
flashing N in the instrument cluster.<
Gear indicator
R N 1 to 6
The gear currently engaged is displayed; in the
Drive mode, a D appears in front of the gear
Shiftlock
While the vehicle is stationary and before shift-
ing out of N, depress the footbrake, as other-
wise the desired gear shift is not executed.
R Reverse
Select only when the vehicle is stationary.
Sequential mode
Each time the engine is started, the sequential
mode is activated as soon as you move the
selector lever towards the right while depress-
ing the brake pedal.
The gear is changed via the shift paddles or the
selector lever.
It is also possible to drive off in second gear, e.g.
on slippery roads.
D Drive mode
In the drive mode all forward gears are shifted
automatically.
To switch from sequential to drive mode: tap
the selector lever to the right toward D.

Reference
At a glance
Controls
Driving tips
Mobility
41
Kickdown:
For rapid acceleration, e.g. during passing,
depress the accelerator pedal completely. You
achieve maximum acceleration.
To switch back to sequential mode: tap the
selector lever again to the right toward D, or
change the current gear via the shift paddles or
the selector lever.
When driving off on inclines, drive
smoothly without pausing. Do not keep
the vehicle in place by depressing the accelera-
tor pedal; instead, apply the parking brake. Oth-
erwise, the gearbox could overheat.<
Shifting gears
With selector lever
>To upshift, tap the selector lever toward +
>To downshift, tap the lever toward –.
With shift paddles on steering wheel
>To upshift, pull one of the shift paddles
>To downshift, push the paddle.
In the following situations, the SMG in the
sequential mode assists you:
>The transmission will only execute upshifts
and downshifts that will result in an appro-
priate combination of vehicle speed and
engine rpm. For instance, downshifts that
would result in excessive engine speed
cannot be executed
>During a stop the gearbox is automatically
downshifted into first gear
>Shortly before a gear-dependent minimum
speed is reached, the gearbox automatically
shifts down without you taking any action.
Malfunction
The warning lamp lights up. The trans-
mission system is malfunctioning.
Avoid heavy loads.
All of the selector lever positions can continue
to be engaged; in the forward drive positions,
however, the vehicle will be operating in a
restricted gear range only. Have the system
checked as soon as possible.
Towing and tow-starting, refer to page98;
Jump starting, refer to page97.
Overheating
An acoustic warning signal sounds. The gear-
box is overheating. If possible, stop the vehicle
or drive off swiftly so that the system can cool
off again.
Driving Dynamic Control
Driving Dynamic Control allows your BMW to
react in a sportier driving style at the touch of a
button:
>The engine responds more spontaneously
to any motion of the accelerator pedal
>The vehicle is steered more directly and
traction is enhanced
>Cruise control:
When the speed last stored is called up, this
speed is attained more quickly.
Additional features with SMG:
>Gears are shifted more quickly
>The engine speed range is optimally utilized
in the drive mode.
With automatic transmission:
>The Sport program is activated.

Driving
42
To activate the system
Ignition key in position 2
Press the SPORT button.
The LED in the button lights up.
To deactivate the system
Press the SPORT button again.
The LED in the button goes out.
Acceleration assistant with SMG
The acceleration assistant permits optimum
racing-style acceleration on skid-resistant
roads.
Do not use the acceleration assistant too
often, as this could cause the vehicle's
parts to wear prematurely.<
1.Activate Driving Dynamic Control
2.Press the DTC button, refer to page51, for
more than three seconds
3.Depress the accelerator all the way down
rapidly: kickdown. The optimum rpm for
driving off will be adjusted.
To maintain vehicle stability, drive with
the DSC switched on whenever possi-
ble.<
Electric Power Steering EPS
The concept
The electric power steering is a direct, sporting
steering system that is speed-sensitive.
Power support is reduced with an increase in
driving speed.
Malfunction
The indicator lamp stays lit:
The system has malfunctioned or is
faulty.
Steering remains operational.
Have the system checked as soon as possible.
Turn signal indicators/
Headlamp flasher
1High beams
2Headlamp flasher
3Turn signal indicators
If the flashing of the indicator lamp
and the clicking from the relay are
both faster than normal, one of the turn sig-
nal indicators has failed.<
To signal briefly
Press the lever up to the detent but not beyond.
It then returns to the center position when
released.

Reference
At a glance
Controls
Driving tips
Mobility
43
Washer/wiper system
0Wipers retracted
1Intermittent operation or rain sensor
*
2Normal wiper speed
3Fast wiper speed
4Brief wipe
5To set interval time or sensitivity of the rain
sensor
Intermittent operation or rain sensor*
In vehicles equipped without a rain sensor, the
wipe interval is predefined.
The interval time can be set over four stages. In
addition, the wipe interval is varied automati-
cally depending on road speed.
On vehicles with a rain sensor, the wipe interval
is automatically controlled according to rain
intensity. You can adjust the sensitivity of the
rain sensor. It is positioned on the windshield,
directly in front of the interior rearview mirror.
To activate intermittent operation or
rain sensor
Ignition key in position 1 or higher:
Lever to position 1.
In any case, the wipers will move once across
the windshield.
In vehicles equipped with a rain sensor, you can
leave the lever continuously in position1. Then,
as long as the ignition key is in position 1 or
higher, you only need to activate the rain sen-
sor.
Turn rotary dial5 briefly.
To set interval time or sensitivity of the
rain sensor
Turn rotary dial 5.
To deactivate intermittent operation or
rain sensor
Return lever to position 0.
Turn the rain sensor off in automatic car
washes. Failure to do so could result in
damage caused by undesired wiper activa-
tion.<
Normal wiper speed
When the vehicle is stopped the wipers switch
to intermittent wipe, except in vehicles without
rain sensor.
Fast wiper speed
When the vehicle is stopped the wipers switch
to normal wiping speed, except in vehicles with-
out rain sensor.
Cleaning windshield and headlamps*
0Wipers retracted
1Cleaning windshield and headlamps
*
The system sprays washer fluid against the
windshield and activates the wipers for a brief
period.
If the vehicle's lights are on, the headlamps are
cleaned at reasonable intervals.
Do not use the washers if there is any
danger that the fluid will freeze on the
windshield, otherwise vision could be
obscured. Therefore, use antifreeze, refer to
page86.
Do not use the washers if the fluid reservoir is

Driving
44 empty, as the washer pump will otherwise be
damaged.<
Windshield washer nozzles
The windshield washer nozzles are automati-
cally heated
* when the engine is running or the
ignition is switched on.
Cruise control*
Do not use cruise control when unfavor-
able conditions make it inadvisable to
drive at a constant speed. Otherwise, the vehi-
cle could go out of control and an accident
could be caused. Unfavorable conditions
include, for example, twisting roads, high traffic
density, or adverse road conditions such as
snow, rain, ice, or loose surfaces.<
1To maintain, store and increase speed
2To maintain, store and decrease speed
3To recall the stored speed
4To deactivate the system
To maintain, store and increase speed
Above approx. 20 mph / 30 km/h you can main-
tain and store any desired speed.
Press the lever briefly in direction 1:
The system maintains and stores the current
vehicle speed. Every time you tap the lever, the
speed increases by approx. 0.6 mph / 1 km/h.
Hold the lever in position1:
The vehicle accelerates without pressure on
the accelerator pedal. As soon as you release
the lever, the system stores and maintains the
current speed.
If, on a downhill grade, the engine braking
effect is not sufficient, the controlled
speed can be exceeded. Speed can drop on
uphill grades if the engine output is insuffi-
cient.<
To maintain, store and decrease speed
Press the lever briefly in direction 2:
When the cruise control is active, vehicle speed

Reference
At a glance
Controls
Driving tips
Mobility
45
is reduced by approx. 0.6 mph / 1 km/h every
time you tap the button.
Hold the lever in position2:
With the cruise control active, the system auto-
matically reduces the throttle opening to slow
the vehicle. As soon as you release the lever,
the system stores and maintains the current
speed.
To recall the stored speed
Press the lever briefly in direction 3:
The vehicle accelerates to and maintains the
last speed stored.
To deactivate the system
Press the lever briefly in direction 4:
The cruise control is deactivated immediately.
In addition, the system is automatically deacti-
vated in response to the following conditions:
>When you apply the brakes
>When you depress the clutch or move the
automatic selector lever from D to N
>If you exceed or fall below the preset speed
for an extended period, for example by
depressing the accelerator
>If DSC is in action.
You can recall the speed last stored.
Cruise control is also deactivated when the igni-
tion key is turned to position 0.
The stored speed is cleared in this case.

Everything under control
46
Everything under control
Odometer
1Odometer
2Trip odometer
Odometer
With the ignition key in position 0, you can acti-
vate the displays shown in the illustration by
pressing the button – see arrow – in the instru-
ment cluster.
Trip odometer
To set to zero
Ignition key position 1
Keep the button pressed until the trip odometer
counter is set to zero.
Tachometer
Never allow the engine to operate with the nee-
dle in the red overspeed sector of the gauge.
To protect the engine, the fuel supply is inter-
rupted when you approach this sector.
Fuel gauge
When indicator lamp1 begins to stay on contin-
uously, there are still approx. 2.1 gallons/8 liters
of fuel in the fuel tank.
Tank capacity: approx. 14.5 gallons/55 liters.
If the tilt of the vehicle varies, for example when
you are driving in mountainous areas, the nee-
dle may fluctuate slightly.
Fill the fuel tank well before it is empty.
Driving to the last drop of fuel can prevent
the engine from operating properly and result in
damage.<
When you switch on the ignition, the indicator
lamp comes on briefly to indicate an operational
check.
Engine coolant temperature
gauge
Blue
The engine is still cold. Drive at moderate
engine and vehicle speeds.

Reference
At a glance
Controls
Driving tips
Mobility
47
Between the blue and red zones
Normal operating range. The needle may rise as
far as the edge of the red sector during normal
operation.
Red
When you switch on the ignition, warning
lamp1 comes on briefly to indicate an opera-
tional check.
Comes on while driving:
The engine has overheated. Stop and switch
the engine off immediately and allow it to cool
down.
For checking the coolant level, refer to page87.
Service interval display
Remaining distance to next service
The displays shown in the illustration appear for
a few seconds when the ignition key is in
position 1 or after the engine is started.
The next service due appears with the message
OIL SERVICE or INSPECTION, together with
the distance remaining in miles – in kilometers
in Canada – before the next scheduled service.
The computer bases its calculations of the
remaining distance on the preceding driving
style.
A flashing message and a minus sign in front of
the number mean that the service interval has
already been exceeded by the distance shown
on the display. Please contact your BMW center
for an appointment.
Outside temperature
If the vehicle is not equipped with a computer,
the display in the instrument cluster always
shows the outside temperature.
Clock
If you wish to have a permanent time display,
you can have it appear in the car radio display,
refer to the Owner's Manual for Radio.
You can set the clock and the time display in the
car radio as follows.
To set
Ignition key in position 1 or higher:
Hours
1.Keep button2 pressed for several seconds
until the hours are displayed and the colon
flashes
2.Press button1 repeatedly until the required
hour is set
Minutes
3.Press button2 to switch to the minutes dis-
play

Everything under control
48 4.Press button1 repeatedly until the required
minutes are set
5.Press button2 to confirm the settings.
The set time of day is transferred to the car
radio display or appears in the instrument clus-
ter display.
Display mode
In ignition key position 0:
Press button1.
The time of day is displayed for several sec-
onds.
Computer*
Mode selection
With the ignition key in position 1 or higher, you
can use the onboard computer button BC in the
turn signal lever to retrieve information from the
computer for display in the instrument cluster.
Every time you tap the onboard computer but-
ton BC, another function is displayed.
The order of the displays:
>Time
>Outside temperature
>Average fuel consumption
>Cruising range
>Average speed.
With the ignition key in position 1 or higher, the
last active setting is displayed.
If you wish, you can have all the displays
of the following functions shown in
another unit of measure.<
Outside temperature
To change the unit of measure, °F/°C
While the temperature display is active, keep
the onboard computer button BC in the turn
signal lever pressed until the display changes.
Ice warning
If the outside temperature drops to approx.
37.57/36, the computer automatically
switches to the outside temperature display.
A signal also sounds and the display flashes for
a short time.
Clock
Setting the 12-hour or 24-hour mode*
If the vehicle is equipped with a computer, you
can have the time displayed in either a 12-hour
or 24-hour mode.
While the time display is active, press the
onboard computer button BC in the turn signal
lever until the display changes.