Alarm system (DWA) control unit
The software for the DWA has been integrated into the junction box electronics (JBE). The JBE controls the DWA. All relevant DWA components are connected with the JBE either directly or indirectly (via the K-CAN).
The JBE is also the activating control unit for the central locking drive. The JBE handles activation of all the central-locking drives. If the CAS control unit approves the unlocking of the vehicle, for example, the doors will be unlocked.
The JBE is a component of the junction box. The junction box is an assembly consisting of the JBE and power distribution box.
The power distribution box supplies the siren with tilt alarm sensor using terminal 30.
The JBE and power distribution box cannot be exchanged individually.
| Item | Explanation |
|---|---|
| 1 | Comfort Access (CA) |
| 2 | Outer door handle on driver's side with door contact on driver's side and, if Comfort Access is fitted, the button for the outer door handle on driver's side |
| 3 | Engine compartment lid contact switch |
| 4 | Diversity aerial |
| 5 | Junction box electronics (JBE) in the junction box |
| 6 | Voltage distributor in the junction box |
| 7 | Siren with tilt alarm sensor |
| 8 | Central locking drive for tailgate (R56) or split door (R55) |
| 9 | Ultrasonic interior movement detector (USIS) with 2 ultrasonic interior sensors |
| 10 | Door contact on passenger's side and, if Comfort Access is fitted, the button for the outer door handle on passenger's side |
| 11 | Footwell module (FRM) |
| 12 | Car access system (CAS) |
| 13 | Alarm system LEDs (3 LEDs) |
| Body bus | Body bus |
| Body CAN | Body CAN |
| Kl. 30 | Terminal 30 |