After catching the car thief when getting the peeping Tom call, the shot of the radio is lit as if it was daylight. This scene supposedly takes place at night.
The 1 in 1-Adam-12 indicates they are assigned to downtown L.A. at Parker Center, the station they use for shots is Rampart Division. When their unit breaks down it is towed back to the station by the North Hollywood OPG (Official Police Garage), which is in the Valley and not part of the downtown area.
Although Malloy and Reed are issued a Plymouth Belvedere as a replacement car, in many long shots and close ups they are in their usual Matador.