Heated Glass Element Switch: Testing and Inspection

For instructions on how to use the DRB III scan tool or the a/c heater control self-diagnostics to test the control, (Refer to HEATING & AIR CONDITIONING - DIAGNOSIS AND TESTING - SELF DIAGNOSTICS). The problem is not with the a/c heater control if no trouble codes are found. The next step should be to check the rest of the system after the MTC or ATC head is checked.