adding headlight washers

adding headlight washers

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Just putting a ZT front on one of my 75s and have been doing a bit of research on adding the headlight washers.
The short story is it appears you can retro fit the washers to a 75 as long as you have a specific horn (bbus) and the required second washer pump to the existing tank (there is a spot already there for it) but the real issue appears to be the activation of the BCU to switch on the headlight washer option which is linked to this bbus horn.
Im assuming all the wiring for the second pump and the bbus horn are in place ??
It appears that it needs a T4 session but when that was tried it was found that an earlier disc version of T4 was required,a T1 disc.
Im wondering if anyone has used TOAF to enable headlight washers or if TOAF can access the option ?
Im aware there is an alternative setup to make the headlight washers work using 2 relays but it would be nice to get the factory setup to work if possible.
Trying to ascertain this before buying a bbus horn .

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adding headlight washers