Cruise Control

Cruise control functions are activated directly from the stalk (lever) to the ECM. The individual positions (requests) are digitally encoded and are input to the ECM over a serial data wire.

The cruise control operational requirements are BMW "typical". The E85 does not have a "system on" indicator light. 

Cruise Control is integrated into the ECM because of the EDK operation.

Fig 1: Identifying Cruise Control Switch

Courtesy of BMW OF NORTH AMERICA, INC.

• The ECM controls vehicle speed by activation of the Electronic Throttle Valve (EDK).
• The clutch switch disengages cruise control to prevent over-rev during gear changes.
• The brake light switch and the brake light test switch are input to the ECM to disengage cruise control as well as fault recognition during engine operation of the EDK.

Road speed is input to the ECM for cruise control as well as DSC regulation. The road speed signal for cruise control is supplied by the DSC Control module.