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Rear Window Defogger Grid Test

  1. Shine a strong light through grid from inside vehicle. Inspect grid from outside vehicle. Broken grid lines will appear as Brown spots. Run engine at idle. Turn rear window defogger switch on. Rear window defogger indicator should illuminate.
  2. Connect negative lead of DVOM to ground. Touch positive lead from DVOM to wide Red/Brown strips on rear window. DVOM should indicate 10-13 volts. If voltage is lower, window grid ground wire (pigtail) connection is loose.
  3. With DVOM negative lead grounded, touch DVOM positive lead to each grid line at its midpoint. A reading of 6 volts indicates grid line is good. A zero reading indicates grid line is broken between midpoint and battery side of grid. A 12-volt reading indicates grid line is broken between midpoint and ground.
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