relay BMW X5 2002 E53 Central Body Electronics ZKE Manual

Sunroof Motor/Module (SHD): The motor is powered to open, close and lift the sunroof
panel. The motor contains two hall effect sensors that monitor the motor shaft rotation pro-
viding sunroof panel position.
The hall sensors also provide the end limit cut
out function for the SHD once the system is ini-
tialized. The SHD counts the pulses and cuts
the motor out prior to the detected end run of
the sunroof panel.
The combined motor module has a pin con-
nector for interfacing the switch, and vehicle
harness (power, ground and Bus.)
The electronic controls and relays are contained in the sunroof module (PM-SHD). The
module is connected to the P-Bus (E38 >99 MY on the K-Bus) for comfort closing/open-
ing and diagnosis/fault memory purposes.
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Central Body Electronics ZKE III
System Components: Inputs - Processing - Outputs
/K-BUS

Workshop Hints
SHD Self Diagnosis
The SHD monitors operation and stores fault codes if a defect is determined. The SHD
monitors the following conditions:
• SHD motor relays:The relays are checked for sticking contacts (plausibility) and non
functional contacts.
• Hall effect position sensors:The SHD must detect a pulse frequency from the hall
effect sensor(s) during operation.
• Sunroof Switch: The SHD monitors the signal plausibility of the coded signaling from
the sunroof switch.
Sunroof Fault Response Characteristics
If a fault occurs with any of these functions, the SHD responds as follows:
• Overrides the end run detection.
• Switches the motor off if the relay contacts stick for more than 500 ms.
• Switches the motor off if pulses are not received.
Emergency Operation of the Sunroof
If the sunroof motor does not respond to the switch signals, the hex key in the trunk lid tool
kit is used to manually turn the motor shaft drive.
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Central Body Electronics ZKE III

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 remain activated. Circuits controlled by
consumer cut off will be switched off as the GM enters into the sleep mode.
For example, the interior lights are connected to the consumer cut out circuit (KL 30) and
can remain on if one of the control switches are left on. The consumer cut off will deacti-
vate KL 30 to the interior lighting after 16 minutes (or with the DISplus/MoDIC).
The following circuits are con-
trolled by consumer cut off:
• Map/Reading Lights
• Glove Box/Luggage Compart-
ment Lights
• Transmission Range Indicator
Light
• Overload Protection Relay for
- Power Seat Motors
- Steering Column Motors
Overload Protection
The seat and steering column motors receive
operating power through the consumer cutoff/
overload protection relay module. The consumer
cutoff signal from the GM signals the relay to
maintain operating power to the consumers.
If the relay module detects an increase in amper-
age (overload) the relay will open. The relay mod-
ule (K-72) is located in the electrical carrier
behind the glove box. The relay is reset by
switching the ignition “off” for 16 minutes, dis-
connecting the relay or the DISplus/ MoDIC.
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Central Body Electronics ZKE III
E38 Shown
Overload
Protection Relay
Module