Central Control Module: Description and Operation
Central Body Electronics (ZKE II):
This section describes the central body electronics (ZKE II) in general. If a defect occurs solely in a parts system of the central body electronics (ZKE) then follow the diagnostic procedure for the corresponding part system.
Functional Description:
Image Legend:
Nr. Abbreviation Description
1 GM General module
2 RM Relay module
3 TMFT Driver's door module
4 TMBT Passenger's door module
5 SHDM Sunroof module
6 Power windows switch block
7 Electronic power circuit protection relays: K15, K30
8 SPA module
9 ADV module
10 3 x wiper relay
11 SIR relay, washer pump relay
12 Rear lid relay, consumer load cutout
13 Interior light relay
General:
In order to increase its reliability, the central body electronics system (ZKE II) comprises several components which are connected to the general module (only the components 1 - 6) by way of data lines. Each of these components undertakes certain control and monitoring tasks.
Components of the ZKE:
1. General Module (GM): Central unit of the ZK:
- controls the data exchange with other control units
- controls the data exchange with the ZKE components 2-6c
- controls the relay module functions controls the electronic power fuse
2. Sunroof Module (SHDM): Control module linked to general module (GM) controls and monitors the SHD motor:
3. Driver's Door Module (TMFT): Control module linked to general module (GM):
- controls and monitors door lock heating (TSH)
- monitors front power window on driver's side
- monitors central locking motor drive on driver's side
4. Passenger's Door Module (TMBT): Control module linked to general module (GM):
- monitors front power window on passenger's side
- monitors central locking motor drive on passenger's side
5. Relay Module (RM): Driven by the general module (GM):
- contains the relays for power windows and central locking system
- switches the relays for wiper, wash pump, intensive wash, unlocking rear lid and consumer load cut-out
- switches the ADV module (ADM)
- switches the SRA module (SRM)
General: The power supply to all ZKE modules is interrupted when the relay module is removed
6. Power Window Switch Block on Driver's Door:
7. ADV Module (AD M): Relay module for windscreen wiper pressure control:
8. SRA Module (SRM): Relay module for headlamp washer system and auxiliary wash pump in luggage compartment:
9. Electronic Power Circuit Protection: Fuse protection of load circuits:
Electronic Power Circuit Protection:
Electronic power circuit protection for the motor drives of the power windows (FH), sunroof (SHD) and central locking system (ZV) is provided by the electronic power fuse. It consists of the power measurement circuit in the relay module (PM), the control in the general module (GM) and the 2 fuse relays (ES relays) k15 and K30.
- ES relay k15: Driver's power window, ZV, SHD
- ES relay K30: Passenger's power window
Power measurement circuit: Constant current measurement of the drives for FH, ZV and SHD in the relay module (RM) and transfer of measured values to the general module (GM).
Control: If a current limit value is exceeded, the general module no longer activates the corresponding ES relay.
Note: The ES relay is always only on for as long as an FH, ZV or SHD function is active.
Repeat lockout: If the relay module (PM) detects excess current, the corresponding ES relay is not activated for 60 5. The relay can be driven once again after 60s. It is switched off again if the fault still applies. This automatic switching cycle takes place 6 times in succession, it is then followed by activation of the repeat lockout. The repeat lockout can be canceled by switching the ignition off and on (terminal 15).
ES-relay: The ES relays k15 and K30 switch battery voltage to the power circuits for the power windows and central locking system in the relay module (PM) and to the sunroof module. The relays are driven by the general module (GM).
Fuse link: Additional fuse protection (30 A) of the power circuits in the case of the ES relays being defective.
Load Cut-out:
The interior lights (LB), the glove compartment, engine compartment and luggage compartment lights can be switched on when the vehicle is
parked. This places an unnecessary load on the battery when switched on permanently. To avoid this situation, the battery supply to the above specified lamps is cut 16 minutes after parking the vehicle.