RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN C (2002)
The headlamp relay terminals are connected to the vehicle electrical system through a connector receptacle in the Power Distribution Center (PDC).
The inputs and outputs of the headlamp relay include:
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The common feed terminal (30) is connected to ground at all times through a take out and eyelet terminal connector of the right headlamp and
dash wire harness that is secured by a ground screw to the left fender inner shield near the PDC in the engine compartment.
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The coil ground terminal (85) is connected to the Central Timer Module (CTM) through the security relay control circuit. The CTM energizes the
headlamp relay control coil by internally pulling this circuit to ground.
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The coil battery terminal (86) is connected to battery current at all times through a fused B(+) circuit that is internal to the PDC.
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The normally open terminal (87) is connected to the headlamps at all times through the beam select switch low beam output circuit. This circuit
provides a path to ground for the headlamps through the common feed terminal when the headlamp relay control coil is energized by the CTM.
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The normally closed terminal (87A) is not connected to any circuit in this application, but is grounded through the common feed terminal when the
headlamp relay control coil is de-energized.
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The headlamp relay can be diagnosed using conventional diagnostic tools and methods.
