3315656 - E3080 HEADLAMP AGLINMENT CORRECTOR - Functional description (Right hand drive, Xenon Gas headlamps)

Functional description

The xenon lamp adjustment system receives its supply, only with the side lights on, at pin 16 of control unit M87 and at pin 1 of the actuators N30 and N31 from the external lights switch H6 , which in turn receives its ignition-dependent supply (INT/A) at pin 10 through fuse F5 of the junction unit B1 . The control unit M87 is connected to earth C30 via pin 1 while actuators N30 and N31 both have pin 4 connected to earths C10 and C13 respectively. The control unit M87 , via pins 14 (positive) and 9 (earth), supplies both adjustment sensors K28 and K29 at pins 3 (positive) and 1 (earth). The sensors K28 and K29 in turn supply, as an output from pin 2, the alignment signal which reaches the control unit M87 at pins 13 (front alignment) and 12 (rear alignment) respectively. The actuators N30 and N31 (stepper motors) are controlled by two specific signals: a direction signal (up or down), sent from pin 17 of the control unit M87 to pins 3 of the actuators, and a pulse signal (travel), sent from pin 18 of the control unit M87 to pins 2 of the actuators. The control unit M87 is also connected by pin 11 to the system diagnostic socket R10 , and by pin 15 to the instrument panel for switching on the fault warning light if a malfunction of the system is detected.