Grand Caravan V6-3.3L VIN E Flex Fuel (2007)
Heated Glass Element Relay: Description and Operation
Operation
OPERATION
The ISO-standard rear window defogger (EBL) relay is an electromechanical switch that uses a low current input controlled by the front control module
(FCM) to control the high current output to the rear window defogger grid lines and heated mirror grids (when equipped). The movable, common feed
relay contact is held against the fixed, normally closed relay contact by spring pressure. When the electromagnetic relay coil is energized, it draws the
movable common feed relay contact away from the fixed, normally closed relay contact and, holds it against the fixed, normally open relay contact. This
action allows high current to flow to the rear window defogger grid lines and heated mirror grids.
When the relay coil is de-energized, spring pressure returns the movable relay contact back against the fixed, normally closed contact point. The resistor
or diode is connected in parallel with the relay coil, and helps to dissipate voltage spikes and electromagnetic interference that can be generated as the
electromagnetic field of the relay coil collapses.
The EBL relay cannot be repaired and, if faulty or damaged, it must be replaced. Refer to the appropriate wiring information for diagnosis and testing of
the ISO-standard relay and for complete rear window defogger (EBL) wiring diagrams.
