Lane Assistant (LA) activation, function

W54.71-1067-82

1 ASIC data bus

A7 Base module (GM)

A62 Lane assist (SPA) control unit

A68 Master switch module 4

A78 Dash support switch module 3

A127 Lane Assistant camera

CAN 1 Vehicle CAN

CAN 2 Interior CAN

S1 Drive switch

S148 Lane Assistant button

The Lane Assistant (SPA) can be activated after switching on the ignition by pushing the Lane Assistant button (S148) in the switch module 3 dash support (A78).

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Requirements

 Power supply present for all affected control units and networking intact

 The drive switch (S1) is in the driving position:

 "Ignition ON" (circuit 15)

 Lane Assistant (SPA) deactivated

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Function sequence

1 The Lane Assistant button (S148) is a signal switch. This means an electronic circuit is located in the button which reads in the switch operation and converts it into a message. If the upper rocker of the Lane Assistant button (S148) is pressed, the installed electronics transmits the message "Lane Assistant ON" to switch model 4 master via the ASIC data bus (1) (A68).

The red status LED in the Lane Assistant button (S148) is switched on at the same time.

2 The switch module 4 master (A68) receives the message and forwards it over the interior CAN (CAN 2).

3 The base module (GM) receives the message through the interior CAN (CAN 2) (A7) and transmits it to the Lane Assist (SPA) control unit over the vehicle CAN (CAN 1) (A62).

4 The Lane Assistant function is activated as soon as the Lane Assistant (SPA) control unit (A62) receives the "Lane Assistant ON" message.