Tracker 2WD L4-2.0L VIN C (1999)
Heated Glass Element: Component Tests and General Diagnostics
Defogger Grid Lines Diagnosis
TOOLS REQUIRED
J 34029-A Digital Multimeter
In order to locate inoperative grid lines, start the engine and turn on the rear window defogger system. Ground the negative (-) lead of the J 34029-A.
Lightly touch the positive (+) lead to each grid line. Voltage will decrease as the lead is moved farther away from the feed bus bar. If the J 34029-A
shows a high voltage at both ends of the grid lines, inspect for a loose ground terminal-to-bus bar connection or a loose ground wire-to-body connection.
Test all grid lines in at least two places in order to eliminate the possibility of bridging a break. For best results, contact each grid line a few millimeters
on either side of the window centerline. If an abnormal meter reading is apparent on a specific grid line, place the lead on that grid line and move the
lead until the voltage drops significantly. A drop in voltage indicates a break in the continuity of the grid line. Use a wax pencil or a crayon in order to
mark the grid line breaks on the outside of the window.
