Jeep Workshop Manuals
Grand Cherokee 2WD V6-3.7L (2008)
Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Description and Operation > Description > Page 247
Blower Motor Relay: Description and Operation
The ISO-standard blower motor relay is an electromechanical switch that uses a low current input from the ignition switch to control the high current
When the relay coil is de-energized, spring pressure returns the movable relay contact back against the fixed, normally closed contact point. The resistor
The blower motor relay terminals are connected to the vehicle electrical system through a receptacle in the power distribution center (PDC). The inputs
Terminal (30) receives fused battery current at all times.
Terminal (85) is connected to a ground circuit at all times.
Terminal (86) receives fused battery current through the run relay only when the run relay coil is energized.
Terminal (87) provides fused battery current to the blower motor through the blower motor relay only when the blower motor relay coil is
Terminal (87A) is not connected to any circuit in this application, but provides a battery current output only when the blower motor relay coil is
The blower motor relay cannot be repaired and must be replaced if found inoperative or damaged. Refer to the appropriate wiring information for
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