Jeep Workshop Manuals
Grand Cherokee 2WD V6-3.7L (2008)
Relays and Modules > Relays and Modules - Lighting and Horns > Trailer Lighting Relay > Component Information > Description and Operation > Description > Page 318
Trailer Lighting Relay: Description and Operation
The trailer tow relays are electromechanical switches that use a low current input from the Front Control Module (FCM) (also known as the Integrated
The movable common supply contact point is held against the fixed normally closed contact point by spring pressure. When the relay coil is energized,
The inputs and outputs of the trailer tow relays include:
Common Supply Terminal (30) - The common feed terminal is connected to a fused B(+) circuit at all times.
Coil Ground Terminal (85) - The coil ground terminal is connected to a control output of the FCM through a right or left trailer tow turn relay
Coil Battery Terminal (86) - The coil battery terminal is connected to a fused B(+) circuit at all times.
Normally Open Terminal (87) - The normally open terminal is connected to the trailer lamps through a right or left trailer tow turn signal circuit
Normally Closed Terminal (87A) - The normally closed terminal is not connected to any circuit in this application, but will have battery voltage
The trailer tow relays as well as the hard wired inputs and outputs of the relays may be diagnosed using conventional diagnostic tools and procedures.
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