Halogen headlamps

When the dipswitch is moved to the spring-back position, CIM sends the bus message "Flash to pass active ON". UEC lights main beam by supplying voltage from control module pins 17 and 21 to pin 2 of the headlamps (11FL/FR).

Fig 1: Identifying Halogen Headlamps

Courtesy of SAAB-SCANIA OF AMERICA, INC.

At the same time, UEC sends the bus message "Main beam active", which is used by MIU to light up the main beam symbol.