It's been about a year since the last reply to this thread but hopefully some of the original respondents are still on here. I have a 2004 Impala SS Indy and I've been having an issue that other posters in this thread have mentioned- blower will stop working and then work again upon hitting a bump or smacking the dash, etc. As the months have gone on I've had to get more involved in the fix.E.G. Smack the underside of the blower assembly with rubber mallet, remove the dash control module and jiggle the cables, etc. To get the blower working again. I am now at the point where absolutely nothing I try works and of course it's the coldest day of the year. I have never had the issue with this particular car of the blower working on only one speed, as I have had that issue with other Impalas, so it did not scream issue with the resistor to me. I've also not had the issue of the blower not turning off when the car is off. In trying to diagnose this issue I've exhausted my brain and everything that I've been able to diagnose defies everything I understand about electrical circuits. I'm hopeful somebody can makes more sense of this than me. Here's where we're at:
-Fan doesn't spin at all.
-All actuators and compressor works
-All fuses under hood and both side fuse boxes test good.
-Replaced blower resistor and blower motor without change in result
-At the 5 pin connector (I'll call it connector 1) going to the blower resistor I have battery voltage at pin C at all times.
-Connector 1 ground pin A has less than 2 ohms resistance with chassis ground.
-Connector 1 pins D and E have no continuity with each other or pins A B or C when not plugged into resistor (no short within the harness)
-Connector 1 pin B has less than 2 ohms resistance with it's wire in the connector to the dash control module.
-With car running, connector 1 pin C registers a voltage varying between 0 (off) and.15 volts (highest speed) depending on the speed setting
-I hotwired connector 1 in the following way- grounds on pins A and D jumped and hots on pins C and E jumpered and removed the resistor. On the 2 pin connector doing going to the blower motor (I'll call it connector 2) I have full battery voltage between the two pins (as would be expecting expected from bypassing the resistor.)
-Plugging connector 2 into the old blower or new blower does not spin the blower at all even though this set up should be bypassing both the resistor and dash control and providing direct 12v battery access.
I am completely stumped. It seems like I have voltage but no current. Have no idea what to do next. TIA
Tuesday, November 12th, 2019 AT 10:43 AM