still got this haunting me, put second hand abs unit on, still the same, managed to get wiring diagram from bosch in german so not that good,but pin 17 shows speed signal out to clocks got square signal and this disappears when we reach 50mph speedo stops and steering goes light,switch ignition off and on all works again till you get to 50mph.If i disconnect any of the front sensors the speedo doesn't work so it must use both for a referance.I now suspect clocks,but can anyone tell me this when i scope the signal at the clock end i get a signal, if i disconnect the multiplug the signal disappears so it must break the circuit.
am i missing something basic here? so i suspect the clocks but can't sus why the signal goes if its coming out of the abs unit.
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