Headlamp range adjustment (HRA), location of components - GF82.10-P-0001-01C
Model 129 with code (612b) Xenon headlamp unit
The illustration shows model 129 without ADS. On vehicles equipped with ADS the front axle level sensor and rear axle level sensor take over the functions of the front and rear axle headlamp range adjustment sensors (A52 and A51).