This is what I happened, while leaving a roundabout traction control went crazy, I assumed I'd driven over a diesel spill. Shortly after glow plug light starts flashing. Drove car home.
Both brake lights not working, LED strip OK, no voltage at brake terminal on tow bar socket. Brake pedal at rest and first 6 LEDs left to right glow with ignition on.
Visually checked brake bulbs
Obtained following error codes:
Replaced brake switch but over sized barbs prevented it being twisted into position. Filled barbs but left switch slightly loose, so glued with a spot of Araldite. While glue setting continued test with old switch. Cleared error codes that reoccurred instantly on starting engine.
Checked tow socket showing unusual and missing outputs, stripped socket to look for damaged wires. Found nothing.
Connected new switch and changed brake bulbs; both blown. LEDs stopped glowing, brake lights work and glow plug light didn't flash after engine restart. Brake output appears at tow socket. Clear error codes, no new codes showing after drive.
Any ideas what that is all about, simply two blown bulbs? Or could that switch have been responsible for the implausible signal and glowing LEDs?