Check wiring on carbon brushes in the CAC circuit. Does the car make a one floor run down? HG pulling in after the car takes off indicates that it sees a call above the car. LG being in makes the car run down in answer to the calls. CAC sees the call and fires CST or SE reset to tell the car to decelerate. The carbon brush in the CAC circuit is split and the bottom half looks for car calls in the down direction. Independent service usually only takes one call at a time and therefore stops on loss of LG and HG. Does the car resspond to hall calls properly? This uses DHC and UHC brushes. Has the car always done this? Or has it just started having a problem?
Last edited by Johnny; 09/27/14 09:34 PM.
