Power for the headlights goes directly from the battery to the headlight
switch, then to the dip/flash switch on the column.
The fact that the high beams are working but not the low beam says the
problem is somewhere between the switch on the column and the
headlights.
Either the switch has failed, or there's a broken wire or open connector
in the wiring harness.
The wiring for the low beams is a blue wire with red tracer. Check the
wires coming off the steering column with a voltmeter to see if the
problem is with the switch or the wiring forward of the steering column.
If you have power at the connector harness coming off the switch, then
keep working forward to find the open circuit.
Please see my tip at http://www.fixya.com/cars/r6022358-relay_check and let me know if you have questions.
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