General information BMW X5 E53

Model: E38, E39 and E53

Production: From Start of Production

The ZKE III system was introduced on the E38 in 1995 and subsequently used on the E39 and the E53. ZKE III is responsible for the control of various body electronics systems. Although there are some functional differences from model to model, the majority of the functions and systems are identical.

The ZKE III system is comprised of the General Module (GM III) which is connected to a network of peripheral modules all connected by a bus network. The Peripheral Bus (P-Bus) is responsible for transferring commands and information between various system components.

The modules on the P-Bus which are connected to the GM include

Scheme 338

1. Driver's side door module (switchblock) PM-FT/SB
2. Passenger door module (PM-BT)
3. Sunroof module (SHD)
4. Seat/mirror/steering column module PM-SM

The modules of the ZKE III system are networked together by the P-Bus to control the functions of the body electronics which include

Systems controlled directly by the GM III

1. Windshield Wiping/Washing
2. Automatic Interval Control (Rain Sensor)
3. Headlight Washing
4. Tailgate Wiping/Washing
5. Interior Lighting
6. Central Locking
7. Keyless Entry
8. Key Memory
9. Power Trunk Release
10. Electric Opening of Tailgate
11. DWA Alarm System
12. Servotronics
13. Consumer Cut-off/sleep mode
14. Diagnosis

Systems controlled by the Driver's Door Switch Block module

1. Power Windows
2. Mirror Adjustment/Memory/Heating

Systems controlled by the Passenger's Door Module

1. Mirror Adjustment/Memory/Heating
2. Power Windows

Systems controlled by the Sunroof Module (SHD)

1. Power Sunroof

Systems controlled by the Seat/Mirror/ Steering Column Memory Module

1. Seat Adjustment/Memory
2. Steering Column Adjustment/Memory