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 and no further ZKE function is active.
For example, the approximate E39 (528i) Battery draw is:
- Ignition switch off = approximately 750 mA.
- One minute after = approximately. 560 mA.
- After 16 minutes (sleep mode) = approximately. 18 mA.
All modules in the ZKE system will go into the sleep mode. The P-Bus remains active, however no data transfer takes place until a wake-up request is received. The general module, door modules or keyless remote module can wake the system up and put the ZKE back on line. The K-Bus is active (high) in the sleep mode.
Sleep Mode Criteria: KL R, KL 15 OFF and no further function activated for 16 minutes.
Wake Up Criteria: KL R or 15 "ON" or a change in one of the signals listed below.
SIGNAL SPECIFICATION
| Signal | Activity | Originating Module |
|---|---|---|
| K-Bus | High | General Module |
| Door jamb switches (up to 4) | Low | General Module |
| Trunk lid lock cylinder microswitch | High | General Module |
| Trunk lid pushbutton microswitch | Low | General Module |
| Interior trunk lid pushbutton microswitch | Low | General Module |
| Central locking button | Low | General Module |
| Hood microswitch | Low | General Module |
| Trunk lid microswitch | Low | General Module |
| Interior light switch | Low | General Module |
| FIS Sensor (UIS) | Low | General Module |
| Tilt Alarm Sensor | Low | General Module |
| FBZV operational signal | High | FBZV Module |
| Driver's door lock microswitch (lock) | High | PM-FT/SB |
| Driver's door lock microswitch (unlock) | High | PM-FT/SB |
| Passenger door lock microswitch (lock) | High | PM-BT |
| Passenger door lock microswitch (unlock) | High | PM-BT |