Grand Cherokee 2WD V6-3.7L (2008)
Trailer Lighting Relay: Description and Operation
Description
DESCRIPTION
Vehicles equipped with an optional factory-installed trailer towing package have two trailer tow relays, one for the trailer right turn and brake lamps and
the other for the trailer left turn and brake lamps. The trailer tow relays are conventional International Standards Organization (ISO) micro relays. Relays
conforming to the ISO specifications have common physical dimensions, current capacities, terminal patterns, and terminal functions. Each relay is
contained within a small, rectangular, molded plastic housing and is connected to all of the required inputs and outputs through five integral male
spade-type terminals that extend from the relay base plate.
The trailer tow relays are located in the Integrated Power Module (IPM) in the engine compartment near the battery. Refer to the layout label on the
underside of the IPM cover for specific relay cavity assignment information.
A trailer tow relay cannot be adjusted or repaired and, if ineffective or damaged, the unit must be replaced.
