'95 940 Parasitic Draw

[JaimeMedina]

Hey everyone, I've been having an issue with the battery draining on my 940. I got to pulling fuses and tracked the issue down to fuse 14. I suspect the culprit is the ambient temp sensor which broke off my car a while back. However, after pulling fuse 14 the draw only dropped from 350 milliamps to 100 milliamps. I pulled the rest of the fuses to see if I could get the draw to 0 but to no avail. Is 100 milliamps a typical amount of draw on these cars?

 

[James M]

Realistically you want a little lower, but what is your testing procedure? Do you have the door switches clamped and let everything turn all the way off? Not sure how many modules a late 940 has but it's worth making sure everything is off.

 

[dl242gt]

Disconnect your stereo to eliminate that power off draw. That will take away a chunk of the 100ma that is still a draw.

 

[go240go]

Not sure about a 940, but my 240 had an issue with the light in the glove box not turning off - broken plastic on the glove box door prevented the light switch from being fully depressed when closed.

 

[bobxyz]

tracked the issue down to fuse 14

If I follow the wiring diagram correctly, that fuse should only have power when the ignition switch is on. Does your radio/wipers/cigarette lighter socket/horn work with key out? If so, your ignition switch is bad. There was a recent thread about this same issue, and junk aftermarket switches.

 

[JaimeMedina]

Just wanted to give an update for anyone who may have this problem in the future. After ordering the wrong ignition switch (had the wrong number of pins), I eventually decided to order a new ambient temp sensor instead since my ignition switch didn't appear to be all that worn out. After wiring up the new sensor, I'm no longer having an issue with a draw or the other accessories staying on. Not entirely sure why the lack of the ambient temp sensor was causing those other issues, but just glad that it's finally working.