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Home >> Ford >> 2001 >> Mustang Base, 2D Convertible, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Heated Glass/Defoggers >> Rear Window Defogger System >> Component Tests >> Grid Filament Test

Grid Filament Test

  1. Shine a strong light through grid from inside vehicle. Inspect grid from outside. Broken grid lines will appear as brown spots. Run engine at idle. Depress rear window defogger button. Rear window defogger indicator light should illuminate.
  2. Working from inside vehicle, connect negative lead of a DVOM to ground. Touch positive lead to wide Red/Brown strips on rear window. DVOM should indicate 10-13 volts. If less than 10 volts exist, check for faulty ground at connector C434 (Black wire). Connector C434 is located at right side of rear window defogger grid. Repair as necessary.
  3. With DVOM negative lead grounded, touch DVOM positive lead to each grid line at its midpoint. A reading of about 6 volts indicates grid line is good. If DVOM reads about 12 volts, grid line has a break between midpoint and right (ground) side. If DVOM reads 0 volts, grid line has a break between midpoint and left (feed) side. Repair as necessary. See GRID FILAMENT REPAIR  under ON-VEHICLE SERVICE.
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