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  1. uHu

    (Fairly urgent) LX470 AHC (frt riding bumpstop) no AHC dash light or service lights

    Congratulations. Good progress. For pressures, you have to do the reading the right way. This is all described in several threads in here, but in simple terms: There are no pressure gauges/sensors in the AHC system except for the one at the pump. This one is used by TechStream in an inventive...
  2. uHu

    (Fairly urgent) LX470 AHC (frt riding bumpstop) no AHC dash light or service lights

    The FSM lists the voltages expected on each pin on the plugs, and lotsa other diagnosis info.
  3. uHu

    (Fairly urgent) LX470 AHC (frt riding bumpstop) no AHC dash light or service lights

    With no AHC in TechStream and no AHC lights in the instrument panel, I would guess that either the AHC ECU is missing power or earth, or that the ECU doesn't know that the engine is running. There is an Alternator input on the AHC ECU, which I suppose is for the purpose of detecting that the...
  4. uHu

    (Fairly urgent) LX470 AHC (frt riding bumpstop) no AHC dash light or service lights

    Have you checked all the fuses, according to the wiring diagram? It is more than two - that's why i'm asking. There are two fusible links hanging off the battery terminal. Fuses (Size - name): 50 A - AHC (squarish one) 20 A - AHC-IG 15 A - AHC-B 7.5 A - AM1 Those 6 are required for the AHC-ECU...
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