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Does anyone know where the Jake brake module would be installed on a '93 with DDECII? I found the coolant module at the rear of the coach behind the termination box. (Had to remove the top stainless steel cover to access) My jakes do not work and I need to do some volt testing starting at the module. Switch gets power at the armrest.

It is possible to wire the jakes with simple relays instead of the jake brake module, not sure how Newell accomplished connecting the jakes. Just food for thought. Basically the only thing from the ECM is a signal that the engine is at zero throttle position, this only allows the jakes to come on when that signal is present. 
Hopefully someone knows where they hid the jake controls.