1989 — 2002 · platform 129
CIRCUIT 129 is the all-in-one bay for the R129 SL. Pick a facelift and an engine, then ask why the radio is dark, where fuse 9 lives, or which cylinder is dripping on the header.
Start with a symptom
Most ‘dead radio’ cars have a fuse, a trunk battery, or a Bose amp. Work top to bottom — do not pull the dash first.
Walk the treeSplit the job: silent switch is electrical. A pump that runs and a top that stops is hydraulics or a limit switch.
Walk the treePneumatic, not electric. The dash button is the fork in the road.
Walk the treeSplit by generation: HFM/LH cars want spark, fuel and a living harness. ME cars want a crank sensor that still works hot.
Walk the treeA window that does not know where it is will also kill the convertible-top sequence.
Walk the treePSE pumps that never sleep and trunk lamps that never go out are the usual thieves. Measure before you replace the battery twice.
Walk the tree01
Coffin under the hood, bullets in the trunk, battery in the well.
02
Zoomable power, audio, roof, engine and lighting diagrams.
03
Every cylinder, the pump, Pentosin, the sequence.
04
PSE pump, door boots, IR remote, fuel flap.
05
X11/4 pulse, OBD-II, roof Hall, PSE shorts.
06
Fitment ritual, emergency manual, wind roar.
Pit-lane tech
Pick a car in the garage for tighter answers. Uses the same fuse maps and trees as the rest of the bay.