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The easest way to turn on hi and lo beams together when hi beam is on is to connect two wires on multifunctional switch.
You need to connect thick white (middle one) and thick tan wires together.
If you loose exterior light during connecting wires - check fuse #6 at passanger feet fuse block.
Here is the diagram.
it fom '99 but it fit my 04 c5. connect tan and white wires to make lo beam works too, when hi beam is on.
