Wiring Labelling Done

A couple more hours and I now have the loom fully labelled:

I’ve used the codes from the pin out diagram and the labelled and will keep the diagram with the car as a reference. I thought this would be the most logical approach and it helped me to start to get my head around the wiring diagram. The BCU has two connectors (A and B) and if there’s a logic, which I suspect there is, as to which wire is in which pin on what connector, I can’t spot it :D. The wires have come bundled and zip tied together in groups out of the two connectors. I haven’t investigated if this just for convenience or if there has been an attempt to put them in order.

Today, I’m going to work through the wiring diagrams separating the wires out into there different circuits (lights, ignition, aux etc) and then bundle them up that way. Doing this, I’ll also be able to identify the circuits I don’t need. The BCU has a lot of functionality I don’t need (wipers, washers, heater etc). Identifying the circuits in this way might make the task feel a little less overwhelming!

I also need to get back under the car. I’m not an expert in electrics or reading wiring diagrams. There are a few places where understanding how practically the loom will work from the diagram will be easier to understand by looking at the current wiring on the car.

For example (sorry not the best quality image!):

On this lights circuit a 0.35mm RED/black wire comes from the pin and at the black dot splits to the left front and left rear side lights. I can think of any number of ways of implementing this split and googling provides even more! With the little experience I have in this type of job, it’s difficult to assess which is the most robust solution. Tracing some wiring on the car will allow me to establish how the previous builder achieved the same.

I’ve snuck an extra day’s leave from work… it’s just like me to start to build some momentum at the end of a break!