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Originally Posted by goltho
• The green/red (GR) wire from the brake switch pin 3 (C0775-3) is connected to the electronic auto transmission (EAT) pin 43 (C0932-43) ... It currently functions exactly the same as the wire from C0775-4 which controls the brakes lights i.e. power appears when the brake pedal is depressed.
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According to your wiring diagrams this appears to be incorrect. Your diagram shows the brake pedal switch making pins 1 & 3 (sending +12v to two ECUs) but pins 2 & 4 sends an
earth to the LSM, ABS ECU, cruise "relay" and cruise ECU, i.e. not exactly the same function.
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• Whilst T4 confirms the brake lights functioning correctly from C0775-4, it however reports the brakes being permanently on based on C0775-3. This is despite both pins C0775-3 and -4 behaving identically. This alone appears to be preventing cruise from working.
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This suggests that there may be a problem with your brake pedal switch.
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• Pin 6 on the cruise control relay (C0895-6) requires to be connected to C0775-3; in the absence of header C0285 ...
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I can't find C0285. Do you mean C0288?
Simon