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Originally Posted by richtazz
On the digital climate control, the control head is more problematic than the blower module. Since both pieces are quite pricey, I'd diagnose further before I start swapping parts though.
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That's a difficult area to troubleshoot and just about everyone I worked with had to do some form of controlled substitution to determine if it was the climate control head unit or blower motor module.
Digital climate control systems have a diagnostics mode you can go into which may or may not help but it does generate a two digit DTC error code on the display if there is a fault.
Another suggestion is to yank out the blower motor and apply 12v volts to it to make sure it is still good. I recall for module output the best place to check with a multimeter is at the electrical plug for the blower motor.
To troubleshoot specifc output of the head unit, it requires removal of the dash bezel and head unit.
Either way it could be time consuming and tedious and expensive.