battery BMW X5 2005 E53 Central Body Electronics ZKE Manual

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Pages: 80, PDF Size: 4.14 MB

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Page 62 of 80

BMW X5 2005 E53 Central Body Electronics ZKE Manual Driver’s Seat (E38/E39)
Principle of 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 mot

Driver’s Seat (E38/E39)
Principle of 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 direc-
tion.
The pulse position of the motors is stored in the seat module, in an EEPROM (of the PM-
SM), 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.
Diagnosis: The PM-SM communicates with the DISplus or MoDiC. The PM-SM monitors
the seat motors and circuits as well as it's internal operation. Any detected faults are stored
in the PM-SM fault memory and are called up when diagnosing the system with the Fault
Symptom diagnostic plan. The PM-SM also provides status display to the DISplus of the
input and output control signals as well as component activation.
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Central Body Electronics ZKE III
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Page 68 of 80

BMW X5 2005 E53 Central Body Electronics ZKE Manual 68
Central Body Electronics ZKE III
Center Console Switch Center (SZM): From 1999 MY E38, E39 and E53 vehicles are
equipped with a SZM to control the front seat heating and prov

Page 69 of 80

BMW X5 2005 E53 Central Body Electronics ZKE Manual Rear Window Roller Sunblind Operation
The roller sunblind is activated by momentarily pressing and releasing (one touch) the sun-
blind rocker switch in the SZM. The SZM activates the motor in the app

Page 75 of 80

BMW X5 2005 E53 Central Body Electronics ZKE Manual General Functions of ZKE III
Consumer Cut Off
The Consumer Cut Off function interrupts battery voltage to circuits preventing inadvertent
battery drain if one of these consumers were to remai

Page 76 of 80

BMW X5 2005 E53 Central Body Electronics ZKE Manual Sleep Mode
To lower the constant battery draw when the vehicle is parked, the complete ZKE system
will go into the “Sleep Mode” 16 minutes after the ignition has been switched off a

Page 77 of 80

BMW X5 2005 E53 Central Body Electronics ZKE Manual Battery Status
The GM monitors KL R on a dedicated circuit. If the ignition is switched on and detected
via the KL R circuit but the GM does not receive KL R status via the K Bus, the

Battery Status
The GM monitors KL R on a dedicated circuit. If the ignition is switched on and detected
via the KL R circuit but the GM does not receive KL R status via the K Bus, the GM mon-
itors the KL R voltage level. If after an additional 0.3 seconds there is no K Bus activity, the
GM initiates an emergency running program.
A substitute value for vehicle speed is used to allow the GM to operate certain functions.
The emergency running program will terminate if the GM detects a vehicle speed or KL R
status via the K bus.
Diagnosis/Troubleshooting
The GM contains an EEPROM fault memory. Diagnosis and troubleshooting is carried out
with the DISplus or MoDiC. The diagnostic link is through the Instrument cluster over the K
bus to the GM.
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Central Body Electronics ZKE III

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