In reply to a message from Grooveman sent Tue 19 May 2015:
The wiring diagram shows all 4 modules wired into the one
pin in parallel, so cutting a wire isn’t going to make a
difference. Cut all 4 and the VCM will see zero volts,
which is a fault condition with zero volts presented to the
VCM at pin 32 in the connector. If any of the connected
modules sees a bad bulb, it will take the gray/pink wire to
ground and the VCM reports a bulb failure. I think the best
work-around will be to disconnect the gray/pink wire going
into the 36-pin black connector just behind the driver’s
knee bolster near the ignition key and feed it 12 volts from
a source nearby, say the pink/white wire at pin 12 in the
same connector.–
The original message included these comments:
Pete, so you’re saying that the default ‘‘fault’’ condition is open
circuit on the pink/gray wire. Why then didn’t I get a light when
I cut the pink/gray wire coming out of the rear module?
So if I decide to remove the instrument cluster and track down that
single pink/gray wire going into the VCM I should know if the bulb
light is triggered by a power or no power condition on the wire
simple by cutting it! (But I think I essentially did that by
cutting the rear module�s wire?)
–
Pete Peterson 70E(193K) XJ40s(88-270K,89-97K, 94-122K)
Severna Park, Maryland, United States
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