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Old 03-25-2016, 05:53 PM   #1
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Cool A/C system control

Help please: What is the power source for the Denso AC system controller? I have isolated the fan, AC, condensor and heater... all work if I isolate. The a/c light on the dash does not light up and I do not know how to check if the Denso controller is receiving power

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Old 03-25-2016, 06:05 PM   #2
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The A/C compressor electric clutch is controlled by a low pressure switch in the coolant lines. If pressure is low, the compressor won't come on. I'm un-aware of electricity in the condenser, did you mean the electric clutch in the compressor?
Usually the bulb or LED that illuminates the control panel gets it's power from the light switch. It is only powered when the parking or head lights are on.

Wiring diagrams for A/C systems are available in Google.



Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 03-27-2016, 09:25 PM   #3
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You can download wiring diagrams and manual here.

HVAC Systems | DENSO Heavy Duty
Chuck & Teri, 1999 35 ft. Dolphin 5350, F53 Chassis with tag axle, Chassis build date 1/99 in Mexico, Banks System, Trans Command, Air Lift Air Bags on rear, Koni Shocks, Blue OX TruCenter, TigerTrak track bars front and rear, Roadmaster 1-3/4" rear auxiliary sway bar, 2013 VW Passat TDI SEL Premium, 1994 36 ft. Avion 5th Wheel. FMCA #F430129
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