Important: The test lamp brilliance will decrease proportionately to the increased resistance in the grid line as the probe is moved from the battery positive bus wire, to the ground bus wire. The test lamp brilliance may vary from one window to another.
• | If the test lamp shows full brilliance at both ends of the grid lines, inspect for an open or poor connection in the ground circuit of the rear window defogger grid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. |
• | If the test lamp goes out, test the grid line in at least 2 places (1, 3) to eliminate the possibility of bridging the open (2) in the grid line. |
Important: Only use this procedure for rear window defogger systems that have the radio antenna made on the rear glass or where the rear window defogger is being used as a radio antenna.