key BMW X5 2002 E53 Central Body Electronics Workshop Manual

TABLE OF CONTENTS
Subject Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Windshield Wiping/Washing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Optional Rain Sensor (AIC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Central Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Remote RF Keyless Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Model Year 2000 FZV Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Car Memory / Key Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Power Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Window Anti-Trap Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Interior Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Anti-Theft (DWA) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Tilt Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Interior Protection (UIS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Alarm Siren . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Alarm Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Seat Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Mirror Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Seat Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Steering Column Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
General Functions of ZKE III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Diagnosis/Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Revised 6-96

INTRODUCTION
The Central Body Electronics (ZKE III) equipped on the X5 includes the following sub-
systems under the total scope of its control:
• Windshield/tailgate wiping/washing,
including windshield rain sensor (AIC).
• Interior lighting
• Central locking
• Keyless entry
• Tailgate release
The following is an overview of new or changed features found on the X5 ZKE III variant.
• Passenger’s door module is now incorporated into the passenger’s door switchblock
module.
• Sunroof module (SHD) located on the K bus.
• The Central Locking system uses a new style door lock actuator with hall effect sensors
similar to E46.
• The GM III is responsible for the Key Memory feature. It provides the added
convenience of identifying users of the vehicle. Whenever the vehicle is locked or
unlocked via the FZV keyless entry system, a unique key identification signal (key
number) is transmitted to the General Module.
The key identification signal alerts the GM to communicate with other control systems
over the K Bus to store (when locked) or reset (when unlocked) certain driver adjustable
settings for the driver using the specific key. The GM also resets certain driver
adjustable settings that it controls directly.
• Power windows/Sunroof
• DWA alarm system
• Mirror - adjustment/memory/heating
• Seat adjustment/memory
• Steering column adjustment/memory
• Consumer cut-off/sleep mode
ZKE - 2

ZKE - 8
WINDSHIELD WASHING:
Pulling the Windshield Wiper Switch rearward closes the “wash” contact providing a
switched ground input to the GM. The GM activates the windshield washer pump directly
via a power output final stage transistor.
HEADLIGHT WASHING:
When the headlights are on, the headlight
washer pump is activated with the first
activation of the windshield washer pump.
The GM recognizes headlights on via K bus
signalling.
Within the same “on” cycle (ignition key has
not been switched off), it is only activated
again after five successive windshield washer
cycles.
The GM provides a ground on the headlight
washer relay control circuit providing pump
operation. The relay is located in the e-box.
The X5 uses three separate washer pumps
which are all easily accessible on the 5.3 liter
washer fluid reservoir located in the engine
compartment.
GM III
HEADLIGHT WASHER
RELAY
HEADLIGHT
WASHER
PUMP
WINDSHIELD
WASHER
PUMP
TAILGATE
WASHER
PUMP

ZKE - 14
CENTRAL LOCKING
SYSTEM FEATURES:
• The Central Locking system controls the door locks, tailgate locks and Fuel Filler Flap
actuators.
• The familiar single/double locking strategy is maintained from previous systems with a
new style door lock mechanismcombined with dual actuator motors similar to that
of the E46 ZKE V system.
• The automatic locking feature activates the door lock actuators when a road speed
signal of 7.5 MPH is detected via the K-Bus. The factory default encoding of this
feature is off, but can be encoded on for individual users with the Key Memory function.
• The Driver’s door lock location is the only point outside of the vehicle where the key can
mechanically control the central locking system functions. The lock incorporates the
familiar overrunning lock cylinder that breaks away and freewheels if an attempt is made
to destroy the lock with a screwdriver, dent puller, etc.
• The selective unlocking feature is maintained. A single unlock request from the driver’s
door with the key or via the remote transmitter unlocks the driver’s door only. A second
unlock request unlocks the remaining doors and trunk. This feature can be modified
for individual users with the new Key Memory capabilities to activate all lock actuators
simultaneously.
• When unlocked, the X5 uppertailgate can be opened by:
- the tailgate button in the center console SZM,
- trunk release switch pad located above the license plate, or
- the trunk release button on an FZV key.
• With the upper tailgate open, the lower tailgate is then opened by depressing the switch
located along it’s top edge.
• GM and EWS 3.3 interface via the K bus to monitor double lock status and to initiate
double lock override. This feature allows the doors to be opened from the inside if an
accepted EWS key is switched on in the ignition when double locked.

DOOR LOCK ACTUATORS
The actuators are sealed, self contained units with no
replaceable parts. The door lock actuators use hall effect
sensors to provide:
• Door lock key position (driver’s door only),
• Door open/closed status.
The driver’s door lock provides the following signals to
the driver’s door switchblock module (PM-FT/SB):
• Lock / Unlock,
• DWA arm/disarm
• Convenience closing and opening signals.
DOOR LOCK POSITION HALL
SENSORS
The Drivers door switchblock
module monitors these key positions
over two wires. The signals are
generated by two hall effect sensors
(Hall Sensor 1 & 2) located in the
actuator.
When the key is turned, a plastic
cylinder in the lock actuator is
simultaneously rotated by the lock
tumbler extension rod.
A magnet is incorporated in the
plastic cylinder, which when rotated
changes the magnetic influence on
the hall sensors.
The presence of a magnet in close
proximity to the sensing surface of
either hall sensor creates a coded
input over the two wires that the GM
uses to determine the key position.
• Magnet in front of sensor, current flow through the sensor is <5 mA (0).
• Magnet rotated away from sensor, current flow through the sensor is >12 mA (1).
Hall sensor 1 & 2 are not included in the front passenger door or rear door actuators.
ZKE - 16
NEUTRAL
- 0 -
MANUAL
LOCK
HALL SENSOR 1
MANUAL
UNLOCK
• DOUBLE LOCK
 DWA ARMED
 CONVENIENCE
CLOSING (hold
until activated). UNLOCK
 DWA DISARMED
 CONVENIENCE
OPENING (hold
until activated).
HALL
SENSOR 2
TUMBLER
EXTENSION ROD
PLASTIC CYLINDER WITH ASYMMETRICAL MAGNET
(Shown in the Lock Position)

ZKE - 18
ACTUATOR MOTOR CONTROL
There are two motors incorporated in each actuator that provide two separate functions:
•Single lock/unlock function. This motor controls the mechanical lock mechanism
when the central lock button is pressed to single lock the vehicle. The mechanism is
locked at this point but can by opened from the interior by pulling an interior door handle
twice or by pressing the central lock button again. When single lock function is
activated, the fuel filler flap actuator is not locked.
•Double lock/unlock function. This motor is activated only when the vehicle is locked
from the outside at the driver’s door lock with a key or when the GM receives a lock
request from the FZV system. In this case the double lock motor is activated
simultaneously with the single lock motor. The function of the double lock motor is to
mechanically offset an internal rod disabling it from unlocking the vehicle from the
interior. This prevents the doors from being unlocked by any means except from an
unlock request at the driver’s door, the FZV remote key or via central lock button.
• Continuous locking/unlocking will initiate a timed arrest of the locking system. The GM counts
each time the locks are actuated. After approximately 12 cycles, the timed arrest is active.
The timed arrest is deactivated one actuator cycle for every 8 seconds until the counter is
reset to 0. The timed arrest is overridden if a crash signal is received from the MRS III.

All door lock actuators and the fuel filler flap actuator are controlled directly by the GM via
four internal load relays. The drivers door lock actuator has a separate circuit for the
selective unlocking feature.
If this feature is disabled by key memory encoding, the driver’s door lock actuator selective
unlock circuit is activated simultaneously with the balance of the motors during unlock.
CONTROL DURING DOUBLE LOCK:
CONTROL DURING SINGLE LOCK:
SELECTIVE SINGLE LOCK
- CONTROL - SWITCHED POWER -
SINGLE LOCK CONTROL
- SWITCHED POWER -
GROUND
DOUBLE LOCK CONTROL
-SWITCHED POWER-
FUEL
FILLER
FLAP
LEFT
REAR
DOORRIGHT
REAR
DOORPASS.
DOORDRIVER’S
DOOR
SELECTIVE SINGLE UNLOCK
- SWITCHED GROUND -
SINGLE UNLOCK CONTROL
- SWITCHED GROUND -
UNLOCK CONTROL
- SWITCHED POWER -
DOUBLE LOCK CONTROL
-GROUND-
FUEL
FILLER
FLAP
LEFT
REAR
DOORRIGHT
REAR
DOORPASS.
DOORDRIVER’S
DOOR
SELECTIVE SINGLE LOCK
- CONTROL - SWITCHED POWER -
SINGLE LOCK CONTROL
- SWITCHED POWER -
GROUND
NOT ACTIVE
FUEL
FILLER
FLAP
LEFT
REAR
DOORRIGHT
REAR
DOORPASS.
DOORDRIVER’S
DOOR
ZKE - 19
CONTROL DURING SINGLE UNLOCK:

TAILGATE CONTROL
The tailgate can be opened from the following locations:
• Exterior tailgate switch pad above the license plate
• Interior remote tailgate button
• FZV radio key
The remote tailgate button is locked out when the GM
detects a vehicle speed signal > 4 MPH via the K-bus.
The switch has been incorporated into the SZM.
ZKE - 20

REMOTE RF (KEYLESS) ENTRY
The X5 keyless entry system’s operation is carried over from the E38/E39. However, the
FZV key has undergone considerable redesign.
• The remote key receiver is part of
the antenna amplifier and is
installed in the center of the top
section of the tailgate.
The receiver produces a digital
signal based on the transmitter
command and sends it to the GM
for processing.
The GM then carries out all remote
lock system, window/sunroof
convenience closing features and
DWA arming/disarming functions.
• The frequency at which the key transmits the radio signal to the antenna amplifier is 315
MHz.
• The system is also used to convey the key identification number being used to
lock/unlock the vehicle. This is a requirement of the Key Memory feature covered further
on in this manual.
GM III
ZKE - 23
GM III

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.
ZKE - 24TAILGATE OPENS