I know some people have posted similar problems on here, but i do seem to have differences. I've been getting a drain on my battery for ages and after much diagnostics i've narrowed it down to the HVAC system. I think its either the blower control module or the digital climate control inside the car on the centre column. When i remove the motor and replace it with my meter, i get around 0.6amps, which is about right for the amount of drain i am getting. I would like to test the blower control module but have no idea how. I have a Delco 16021606 blower control module, (which according to acdelco, it is now succeeded with p/n 15-72530). This is a 6 pin module (a 2 pin with 1xRed and live, 1xGreen, 4 pin with 1x black and red that goes to the motor, 1 x green, 1 x thick black wire and negative, 1xthin black or possibly dark brown or dark grey). now I am not sure what to test or how, and i have noticed that its gonna be rater expensive to just start replacing parts, so is there a way to test this control module? I cant see a short in the module as there is a resistance between every pin.

Where my problem seems to differ from everyone elses with this problem, there is current flowing through (0.6A) but the blower isnt turning, so i cant tell if there is something wrong with the module or the controls in the car.
any ideas?

much appreciated.

Pete

 

Ok, after some more investigating, its not quite the HVAC system, its the Electronic Climate Control system, so i am either getting a draw from a dodgy Blower Fan Module, ECC thats inside the car, or might it be the ECM? either way, does anyone have a circuit diagram or schematic for the blower fan module mentioned in my earlier post? or any other ideas as to what in this part of the system is causing the draw of current?
cheers people

 

What year? Manual or auto A/C?

 

DOH!!!!! knew there was something i was forgetting. Its a 1986 corvette, automatic electronic climate control system, sorry for missing the year etc out.

 

The ECM doesn't control a/c on an '86 and I'd guess the Blower Module since it's always hot via a fusible link off of the Starter - red wire - (and except for Memory, nothing at the Control Panel is hot with the key off). You might though check the return Blower Signal which is a splice off the Blower Motor Hot Lead - should be Black/Red for an '86. It runs back to the Firewall where it's connected to a 5 amp fuse before heading back to the Control Panel. The Dilbert who designed this thing decided that if the fuse opens, the Blower stays powered up, sometimes with the key off - and generally if it is, the Blower Motor is running at full tilt. Anyway, check the fuse. Otherwise, the red wire shouldn't have anything flowing with the key off and if there's a draw, a new Module should fix it.