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Re: 03 Impala High Beam light on all the time
Some component is sending 12 volts to the HB lamp because one side is always grounded. I would check the wiring from the multifunction switch at steering column to the Instrument Panel (IP). The HB indicator may have a separate contact output from the multifunction switch, although the low/high beams are working properly. Also, there is a decoder module with diodes for all idiot lights in the Instrument Panel.
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