is the driver left side as in USA? (LHD or RHD)?
educated means too we read the service manual (SM)
and the page on rear lamps. Schematics, or we just fiddle about and guess.
fuses all good, we check them all.
the problem #1 is on BCM cars, no 2 BCM work the same
so again the SM comes to our rescue.
BCM is body brain and runs all lamp, in odd ways, you don't know yet.
answering for only USA cars, LHD.
brake lamps are rear amps 2 or 3 total
that socket burnup (where) is signs of dead shorted lamp.
needs new lamp first and new socket 2nd.
the IPS runs all 3 rear stop lamps left, center and right.
facts, Schematic on my screen
all 3 lamps use the same single wire to glow. branks
but not ground
left uses GF04 ground wire to body.
GF04 ground runs the other 2 lamps.
so the only failure here is left lamp
- the lamp bad
- the wire bad (or socket0
- or the ground bad GF04
2 man job, step brake, 2nd man meter in hand.
a voltmeter tells you which one is bad.
step on brake pedal 12vdc here, all 3 on that 1 wire.
ground reads 0v.
yes ,yes, then lamp is bad.
meter black test wire must be to perfect metal ground for tests.
max ground volts is 0.5vdc max.but 0 is goal.
the lamp shorted I guess and burned up parts related.