I think the front are controlled by the BCM, Body Control Module ...
... I said I think they are.
As Ev points out - 'we're' "thinking" (vs. knowing) on this :thumbsup:
Which is why we need valid schematics :yes:
You can't even figure out a license plate light problem on many vehicles without schematics - probably hooked to the RAP-Power system so you don't trip or fall in a ditch walking behind on a dark night
I can't recall what year they went to full BCM (body control module) systems on these. But mid 90's
sounds right.
If the Hazard system was also a no-go in testing, then I would suspect a control module/relay issue.
Hopefully you have checked each individual lmp effected by the system by now. I would consider this a prudent first step before going further.
Remember these are all Dual-element lamps and serve more than one function - IIRC ...
A good wack with a vehicle is enough to jar connections loose, create shorted wiring or just break internal lamp elements many times.
You need to trace down items here that are in common to these systems;
- common power feed/distribution wiring
- common lamp element use
- common function of systems, as in flashing, constant on, tandem use with others.
Finding what all these systems has in common will often lead you to the problem source.
Hope some of this helps ...