1993 XJS 4.0 I had a problem where the high beam only would come on after car was parked. Sometimes took 5 minutes and sometimes 5 hours.
Turned out to be Headlight Logic module relay. DAC6902-OE. $180. Located next to 5 Blue relays in Left side of engine compartment.
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Do you still need a Headlight Logic module relay DAC6902?
I have an extra available.
Steve
Iām all set.
Thanks