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Message: <blockquote data-quote="wateka" data-source="post: 140900" data-attributes="member: 21519">On my 853 there was no PWM. It's just simple open-closed micro relays built in to the epoxy covered module controlled by open-closed switches in the handle. Handle switches are easily replaceable with any replacement handle, as long as it's not a PWM handle. I have not had to do this, but conceptually if your module is bad, bypass it. Wire up your own Bosch-style automotive relays that are controlled by the relevant switch and see what happens. You'll obviously have to do some testing with a multi-meter to identify the correct wires. There are obvious safety items you'll have to deal with if you bypass the module, such as making sure power is only provided to to AUX function when needed. If the handle switches were live all the time, bumping them could have negative consequences.</blockquote>