battery BMW X5 2003 E53 Central Body Electronics Workshop Manual

MODEL YEAR 2000 FZV KEY
Visual Changes:
• New appearance with blue and white BMW roundel.
• New button arrangement (larger buttons) with sequential operation (enhanced operating
convenience)
• Rechargeable battery replaces replaceable batteries. Charged by EWS ring antenna.
• The key housing is encapsulated and can not be opened.
• The LED has been omitted.
• Key will be used in E46, E38 and E39 vehicles.
Features of the keyless entry system include:
• Up to 4 radio-control keys can be operated in conjunction with one vehicle.
• Locking/unlocking of doors, tailgate,
fuel filler lid.
• Selective unlocking of driver’s door (as
with key in lock)
• Arming/dis-arming of DWA alarm system
(if equipped).
• Remote unlocking of the tailgate only.
• Comfort opening of windows and
sunroof
• Interior lighting activation (search mode).
• Panic mode alarm activation..
• Automatic correction for up to 1000
erroneous activation signals.
• Low transmitter battery fault code
storage in the GM.
• An EEPROM is used to store the key
data.
• Keys delivered with a four color label
sheet containing four different colored
labels for each of the four possible FZV
keys.
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FZV KEY RECHARGEABLE BATTERY
From KL R, the battery inside the key head is charged inductively by the EWS ring antenna
via a coil antenna integrated in the key. The charging process is controlled by electronic
circuitry integrated in the key.
• The service life of a radio-control key used under normal conditions corresponds to the
vehicle lifespan.
• If the FZV keys are not used (ie: stored in a drawer), the battery will be discharged after
approx. 1.5 years.
• The time required to fully charge a discharged battery is approx. 30 hours.
• The remote control can be operated about 15 times after a charging period of approx.
30 minutes (driving time).
The key data is stored in a transponder chip. The transponder chip is a wireless read and
write EEPROM. It is powered via the ring coil at the steering lock. Power is applied
electromagnetically when the key is in the ignition switch from KL R.
The power supply is used both for data transfer as well as for charging the battery. This has
been made possible by new development of the transponder chip.
As with previous systems, every press of an FZV key also provides the battery charge
condition. When the FZV electronics receives a low power condition message three
successive times, the GM sets a fault indicating a low battery within a specific key. The
LCM is also informed via the bus system and alerts the driver via an instrument cluster
matrix message.
If the battery is recharged (used operate car), the fault will be automatically deleted when
five successive messages are received indicating a charged battery condition.
The battery has no affect on the EWS III communication function!
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REQUIRED PRECONDITIONS:
Before configuring Car or Key Memory
Functions, connect a battery charger to the
vehicle. This will ensure adequate battery
voltage during the Car/Key Memory
configuration.
If battery voltage drops below 11.8 volts, the
procedure will terminate.
Car Memory Configuration procedure:
From the Coding/Programming Selection
function of the DIS or MoDiC, Select "CAR
MEMORY" and proceed by pressing the
right arrow.
The system will scan for control systems
capable of configuration based on the ZCS
in the Instrument Cluster.
After a short wait the system will display a list
of detected control systems capable of CAR
MEMORY configuration.
Using the owner's selection list, enter the
systems selected for customization.
Example:The owner chooses not to have
an acoustic acknowledgment when the
DWA is disarmed.
• From the displayed list select "Anti Theft
System" and press the continue arrow.
• From the Anti Theft Sub menu, select 4.
Acknowledge.
The Acknowledge sub menu provides all
possible options for the DWA
Acknowledgment.
• Select 2. Disarm Acoustically, and press
the continue arrow.

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The next displayed screen is the "active/not
active" selection.
The blue "=" sign indicates what mode this
particular function is set to at the present.
• Select the "not active" function and press
the continue arrow.
The system will accept the selection and
bring the CAR MEMORY main selection
menu back in the display.
If additional selections are required, enter
into the systems displayed and repeat the
steps from above.
• When all of the required CAR MEMORY
configuration selections are entered, scroll
down to the bottom of the main car
memory menu and select 99 SET
VEHICLE.
All of the selected configuration changes are
now displayed. Check the displayed list
against the Owner's selection list making
sure all of the choices are entered.
Print this list out and place in the vehicle
history file for future reference.
• Press the continue arrow to proceed with
the configuration. The display will request
that the ignition switch be "switched off
and on again". Switch off for a minimum
of 10 seconds, then switch back on.
Press the "Yes" button to continue.
A bar graph indicating configuration progress is displayed along with the current battery
voltage. This portion of the configuration varies in duration based on the total number of
configuration selections. Watch the battery voltage level during the configuration. Low
battery condition will terminate or possibly incorrectly configure the vehicle.

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The blue "=" sign indicates what mode this
particular function is set to currently.
• Select the "not active" function and press
the continue arrow.
The system will accept the selection and
bring the KEY MEMORY main selection
menu back in the display.
If additional selections are required, enter
into the systems displayed and repeat the
steps from above.
• When all of the required KEY MEMORY
configuration selections are entered,
select 99 SET VEHICLE.
The next screen displays all of the selected
configuration changes.
Check the displayed list against the Owner's
selection list making sure all of the choices
are entered. Print this list out and place in
the vehicle history file for future reference if
necessary.
• Press the continue arrow to proceed with
the configuration.
The next display will request that the ignition
switch be "switched off and on again". Press
the "Yes" button to continue.
A bar graph indicating configuration process
is displayed along with the current battery
voltage.
The display will change indicating the
"Vehicle setting completed". Turn the
ignition switch back off for 10 seconds and
then back on. Verify the configuration
change(s) by activating the new function.

HOOD CONTACT SWITCH
Located on the right side engine com-
partment, the hood contact switch pro-
vides a ground signal to the GM signifying
an open hood.
The plunger of this switch can be pulled
up past a detent causing the switch con-
tact to open. This feature can be used to
simulate a closed hood with the hood
open when diagnosing the DWA system.
DWA LED
The LED is provided with constant battery voltage (KL 30). The GM provides a switched
ground signal providing the various blinking signals used to convey DWA status to the vehi-
cle operator (covered further on).HOOD SWITCH
COMPONENTS
DOOR CONTACTS
As mentioned in the Central Locking Section, the door lock contact hall effect sensors pro-
vide status of door open/closed. The GM will activate the siren if a door open signal
becomes active when the DWA is armed.
TAILGATE SWITCH CONTACTS
The tailgate switch contact is located in the tailgate lock actuator assembly. When closed,
the tailgate contact provides a ground signal to the GM signifying a "closed tailgate". The
GM will activate the siren if the tailgate switch contact ground signal opens when the DWA
is armed.
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TILT SENSOR
Located in the electrical carrier forward of the glove
box, the tilt sensor is an electronic sensing device with
the sole purpose of monitoring the vehicle's parked
angle when DWA is armed.
The sensor requires three signal wires to perform its function:
• KL 30 - Constant battery voltage
• Signal "STDWA"; switched ground input signal provided by the GM indicating DWA
armed/disarmed status. The tilt sensor is used as a splice location for the STDWA sig-
nal to the Siren and FIS interior protection sensor.
• Signal "NG"; switched ground output signal provided to the GM. The signal is used for
two purposes,
1. As a momentary acknowledgment that the tilt sensor received STDWA and is cur-
rently monitoring the vehicle angle.
2. If the tilt sensor detects a change in the vehicle's angle when DWA is armed, signal
NG is switched to inform the GM to activate the siren.
When the tilt sensor receives the STDWA signal from the GM it memorizes the vehicle's
parked angle. The angle of the vehicle is monitored by the solid state electronics. Once
armed, if the angle changes, the tilt sensor provides a switched ground signal to the GM to
activate DWA.

ALARM SIREN
The siren is located in the vehicle cowl
on the driver’s side of the vehicle. This
location provides a secure position with
loud acoustic output.
The siren contains electronic circuitry
for producing the warning tone when
the alarm is triggered. The siren also
contains a rechargeable battery that is
used to power the siren when the alarm
is triggered.
The rechargeable battery will allow the siren to sound if it or the
vehicle’s battery is dis-connected. The siren battery is recharged,
from the vehicle’s battery when DWA is not in the armed state.
The siren has four wires connecting it to the system; KL 30, KL 31,
Signal STDWA (arm/disarm signal from GM), and Signal NG (acti-
vate siren output signal to the GM)
The arm/disarm output signal from the GM (STDWA) is provided to the Tilt sensor, FIS sen-
sor and the siren simultaneously. The arm/disarm signal is a switched ground that signals
the components of DWA armed/disarmed status.
The activate siren signal (NG) is high whether DWA is armed or disarmed. If a monitored
input activates the alarm, the high signal to the siren is switched to a 50% duty cycle at
the GM. The control circuitry in the siren activates the siren driver. If the DWA is armed
and the battery is disconnected the siren recognizes the normally high “NG” signal as sud-
denly going low, the siren is also activated.
SIREN INSTALLATION
POSITION
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DRIVER’S SEAT MEMORY FUNCTION
As with previous systems, the seat memory feature of the SM stores three seat positions
for recall. The positions are stored in a non-volatile memory preventing loss of positions if
in case the SM or the battery is disconnected.
The additional buttons on the SM (M) pro-
vide activation of recording memory position
and (1-2-3) for storing or recalling a specific
seat setting.
Storing current seat position:
• Seat in desired position,
• Ignition switch in KL R,
• Press the M button until it illuminates
• Within 7 seconds press the 1,2 or 3 but-
ton to store.
The stored position can be recalled at any time by pressing the appropriate memory loca-
tion button (1-2-3).
MEMORY RECALL MODES OF OPERATION
Depending on current SM input signals via K-Bus, the memory recall operates in two dis-
tinctly different modes:
• One-touch mode (TTB),
• or press and hold mode of operation (DTB).
If the following input signal status is current, the SM resets the seat position by a momen-
tary“one touch”of the selected memory button.
• Ignition switch off with the driver’s door open, or,
• KL R on, door open or closed
If the following input signal status is current, the SM resets the seat position by a continu-
ous ”press and hold”of the selected memory button.
• Ignition switch off with the driver’s door closed
• KL 15 on, door open or closed.

SEAT OPERATION
Each motor for seat adjustment contains a micro-processor (called a Ripple Counter) that
receives a digital signal from the seat control module for motor activation. The motors are
connected to KL 30 and KL 31 and respond to the signals generated by the seat module
when seat movement is requested. The seat adjustment switch provides ground input sig-
nals to the module when seat movement is desired. The module processes these input sig-
nals and sends output signals to the seat motor processors. The seat motor processors
activate the motors and the seat moves to the desired point.
The circuitry of the Ripple Counter detects the motor activation current. As the armature
segments of the motor rotate passed the brushes, the current flow rises and falls produc-
ing a ripple effect. The peaks of these ripples are counted and stored in the Ripple Counter
module. The memory function of the seat module uses this ripple count instead of feed-
back potentiometers to memorize and recall seat positions.
RIPPLE COUNT RECOGNITION
When the seat is installed and the battery is connected, the ripple counter uses the initial
position of the motors as the “Zero Position”. Any movement from this point is counted as
“+” or “-” pulses as the motors move in either direction. The pulse position of the motors
is stored in the seat module, in an EEPROM, before the ZKE goes into its “Sleep Mode”.
This prevents the position recognition from being lost. If the battery is disconnected before
the 16 minute sleep mode activation, the memory positions of the seat will be lost and
reprogramming will be required.
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