Chart E Rear Defogger Grid Partially Inoperative

Diagnostic Chart:

Wiring Diagram:

Buick LeSabre with the heated backlite antenna rear window must be tested in at least three places. Each of the three zones created by the two vertical antenna lines must be checked For best results, contact each grid line a few millimeters either side of the window centerline, If an abnormal light reading is apparent on a specific grid line, place test lamp probe on the grid at the left bus bar and move probe toward the right bus bar until light goes out. This will indicate a break in the continuity of the grid line. Refer to REAR DEFOGGER for further information concerning grid line repair. Heated Glass Element