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#16
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CCU bypass
Step #752 of my blower motor problem diagnosis was to remove the CCU, with the intent of resoldering it. After I pulled the CCU, I removed the bottom plastic plate to reveal the underside of the main circuit board. There were at least two traces where the copper had actually become exposed through the green substrate. That copper had become so corroded that it disintegrated when I touched it. So, this CCU is shot. A replacement unit is around $250, which isn't worth it to me.
So.. what I'd like to do is just install a couple (maybe one) switch to turn the blower fan on and off. On the input connector to the CCU, I measured various voltages at the pins. I measured 12V at pins 7 and 12, if I recall correctly. Question is... to which pin(s) on the OUTPUT connector do I need to apply 12V in order to get my blower motor to spin? |
#17
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If this is the 82 SD, good luck. The diagram (I tried to upload but too small to read) shows PBU C2/P5 BK/GN/WT as automatic blower speed input to the blower controller (also connects to P11 of the electronic unit for temp control), C1/P1 YL/RD as speed 1 input, C2/P8 YL/GN as speed * control, C1/P12 YL/BK as speed 2-* enable input.
Seems to me you're better off hooking up a rotary selector to the blower resistor pack. edit - * means I can't read the cr@ppy FSM scan Sixto 87 300D |
#18
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can you replace the trace with a wire soldered in? Check e-bay, there have been a few on there for less than $70.
maybe piece one together?
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83 300SD Dark Silver Dark brown inside |
#19
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Quote:
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#20
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sd's are in the pick and pulls all the time. grab a couple and get the refund for those that dont work. use yours for the core for the one that does. shouldnt cost much, maybe $15
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1982 300CD Turbo (Otis, "ups & downs") parts for sale 2003 TJ with Hemi (to go anywhere, quickly) sold 2001 Excursion Powerstroke (to go dependably) 1970 Mustang 428SCJ (to go fast) 1962 Corvette LS1 (to go in style) 2001 Schwinn Grape Krate 10spd (if all else fails) |
#21
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Finally have the blower running! This thing probably hasn't run in many years. I looked at the ETM schematics, and wound up shorting pins 6 and 12 on the connector to the blower motor regulator. This is equivalent to pressing the "high" fan speed button on the pushbutton controller.
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