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Voltage is applied at all times to the Lamp Control Module through the HEADLAMP Circuit Breaker. With the Headlamp Switch ON, the Headlamps input to the Lamp Control Module is grounded. The Lamp Control Module then applies voltage to the Headlamp Dimmer Switch. When the Headlamp Dimmer Switch is in the LO position, voltage is applied through I/P Fuse Block LO BEAM LH, EXP Fuse and LO HIGH BEAM RH, EXP Fuse to the LH and RH Low Beam filaments. The LH and RH Low Beam filaments then light.

When the Headlamp Dimmer Switch is in the HI position, voltage is applied through I/P Fuse Block HI BEAM LH, EXP Fuse and HI HIGH BEAM RH, EXP Fuse to the LH and RH High Beam filaments. The LH and RH High Beam filaments then light. Voltage is also applied to the coil of the Four Lamps Burn Relay which is permanently grounded to G201. The switch of the Four Lamps Burn Relay receives voltage at all times from I/P Fuse Block 4 LP BURN Fuse. With the coil energized, the switch contacts close and voltage is applied to the LH and RH Low Beam filaments. This allows the LH and RH Low and High Beam filaments to be lit.