Steering lock problem solved (for real)

bdl99

But you agree that the blue arrow is an input to the CPU and it won't be hot without the fuse? It wouldn't be an indication of the steering lock status because it would always be hot as long as the relay was activated which the CPU already knows because it triggers the relay via the earth/ground feed above the blue arrow and the status of the lock is communicated by the other wires going from the steering lock to the CPU. As I said it is great that there appears to be no down sides, but it is also unusual for a circuit to include a feed like that if it isn't used. It could simply be for the CPU to know that the activation of the relay was successful, but without seeing the inside of the CPU or having access to the code there would be no way of knowing for sure.

Baer383

Actually I don't see the blue arrow as a input from the S/L ,but as a CPU output to the S/L thats why when the fuse is removed the power is taken from that wire(fuse 48) and then no input is given to the S/L via that wire.And again there have been no issue and no codes.

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2013 ZL1

754 rwhp 747 rwtq

bdl99

I don't see it as either. It is an input from the relay to the CPU. The relay is activated by the wire above the blue arrow, completing the circuit and energizing the coil in the relay. 12V then flows from the fuse through the relay and in to the CPU and the S/L. 12V is fed to both the CPU and the S/L.