BMW 7 Series: System Overview

Input/output Central Locking

Fig. 10: Central Locking Input/Output Diagram

COMPONENTS DESCRIPTION CHART

1. ID transmitter
2. Central locking button
3. Interior trunk button in the A-pillar
4. Car Access System 4 (CAS 4)
5. Center-lock button
6. Central locking, fuel filler flap
7. Exterior trunk button
8. Junction box electronics module (JB)
9. Automatic soft-close drive in the trunk lock
10. Trunk central locking system
11. Lock (4x) in vehicle doors
12. Driver's-door lock barrel
13. Footwell module (FRM)

K-CAN2 - Bodyshell CAN

Central Locking System Circuit Diagram

Fig. 11: Central Locking System Circuit Diagram

COMPONENTS DESCRIPTION CHART

1. Footwell module (FRM)
2. Car Access System (CAS)
3. Center-lock button
4. Junction box electronics module (JB)
5. Front-passenger-door illuminated entry system
6. Door contact, central locking, front passenger door
7. Rear, passenger-side illuminated entry system
8. Door contact, central locking, rear passenger side
9. Fuse in the luggage compartment power distribution box
10. Central locking, fuel filler flap
11. Central locking button
12. Trunk lock central locking system
13. Automatic soft-close drive in the trunk lock
14. Rear, driver's side central locking system
15. Rear, driver's side illuminated entry system
16. Hall sensors for lock barrel, door contact, driver's-door central locking system
17. Driver's-door illuminated entry system
18. Valet switch
19. Remote control receiver in diversity module
20. Exterior trunk button

K-CAN2 - Bodyshell CAN2
KI. 30B - Terminal 30, basic operation
LIN-Bus - Local Interconnect Network bus
GPRL - Luggage compartment light

K-CAN signals at Car Access System 4

CAR ACCESS SYSTEM K-CAN SIGNALS CHART

The radio signal from the ID transmitter is received by the rear window antenna. The remote control receiver integrated in the diversity module (19) forwards the signal to the Car Access System (2). After the signal has been successfully checked, the Car Access System issues a request for control of the central locking system.

The Car Access System is the master control unit for the central locking system.

The junction box electronics module (4) executes the unlocking or locking of the vehicle.

The footwell module (1) evaluates the status of all door contacts (6, 8, 14 and 16). It communicates the current status on the KCAN2. This means, for example, that the Car Access System is able to prevent locking when the driver's door is open.

The status of the center-lock button (3) is evaluated by the Car Access System and communicated over the KCAN2.

Depending on the status, the junction box electronics module activates central locking. The junction box electronics modules is also responsible for registering the status and activating central locking in the trunk.

The junction box electronics module is also responsible for controlling the fuel filler flap (10).

The footwell module evaluates the signals from the Hall sensors for the lock barrel (16) and makes this information available on the K-CAN2.

With this information, the Car Access System knows the status of the door lock in the driver's door. This is important if a request is issued to unlock or lock the vehicle using the ID transmitter, for example.

The central locking button is integrated in the underside of the trunk and is part of the Comfort Access option.

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