Rear Window Defogger Relay: Description

The rear window defogger (EBL) relay is a International Standards Organization (ISO)-type relay. Relays conforming to the ISO specifications have common physical dimensions, current capacities, terminal functions and patterns. The EBL relay is a electromechanical device that switches battery current through a fuse in the power distribution center (PDC) to the rear window defogger grid and to the outside mirror heating grids, when equipped. The EBL relay is energized when the relay coil is provided a ground path by the control circuitry within the body control module (BCM). See Fig 1.

The EBL relay is located in the junction block (JB) in the passenger compartment.

Fig 1: Identifying Relay Terminals

Courtesy of DAIMLERCHRYSLER CORP.