RAM 1500 Van V8-5.2L CNG VIN T (1999)
Rear Window Defogger System
2. Ensure that the rear glass heating grid feed and ground wires are connected to the glass. Confirm that the ground wire has continuity to ground, and
that there is continuity between the electrical contacts in the rear door hinge pillar when the rear door is closed.
3. Check the fuses in the Power Distribution Center (PDC) and in the junction block. The fuses must be tight in their receptacles and all electrical
connections must be secure.
When the above steps have been completed and the rear glass heating grid is still inoperative, one or more of the following is faulty:
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Defogger system control
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Rear window grid lines (all grid lines would have to be broken or one of the feed wires disconnected for the entire system to be inoperative).
If setting the defogger switch to the On position produces a severe voltmeter deflection, check for a short circuit between the rear window defogger
system control output and the rear glass heating grid.
