While a test light may be good for some folks &
for some purposes,you should always just use
a VOM,DVOM or Multi-Meter, whatever you like
to call it
A test light tells you nothing
It may, to you, indicate some sense that you
may have battery voltage at some point,but
how much?
At some point, you will use it in a way as to load
a computer circuit & smoke something
I have no wiring diagram to look at what your doing
Black is usually a ground side wire on vehicles,so
your doing no more than checking battery voltage,
assuming you had to turn on the key & blower switch
Back to square one
You need to see & learn the circuits on paper,thus
a wiring diagram BEFORE you can pick test points
The blower you can power, as you call it, directly to the battery
& any ground,even the body,just to test the motor
My guess, not knowing anything at all about your car,is that
you most likely have a module issue or something in the control
circuit, that provides battery or lesser voltage to the motor
under certain conditions
If you don't understand how the system works, your done
Need those wiring diagrams,good ones,not a useless Haynes
Manual,the factory ones that match your car for your model year
Helm.Com for manuals or a repair shop & print what you need
off their data base.
There might be an over temperature sensor that is fauty. It doesn't have to be activated to fail. Or one of the power connections in the motor is open inside the case.
SOURCE: 1999 cadillac deville blower dont
red black and gray are just half the connections. Red is positive 12 volts coming from fuse of circuit breaker. The black wire is either the ground or the main hot wire going to the blower motor (3 pin connection only), and the gray wire (if is is small in size) is a variable voltage coming from the body control module requesting speed for the blower motor.The blower control module varies voltage on the main wire going to the blower motor, supposedly in accordance with the requested voltage from the body control module. Usually if all fuses are okay and present on the apprpriate wire of the blower control module, the a blower motor that will not run or stays running after the key is turned off is the fault of the blower control module. If the blower control module has failed the the cause must be determined (over amping blower motor) or else new blower control module may fail when powered up.Usually blower control modules have more than three wires. Usual connections are: B+ (battery voltage) GND (chassis or engine ground), two large wires going directly to blower motor (can be any color, but are usually 10 guage in size), and an optional wire that reports voltage level back to the body control module.
SOURCE: blower motor will not work
Do further tests at the relay to ascertain whether the fault lies before or after the relay.
Check power availability at the supply side of the relay contacts - should have 12v from a supply fuse on one side of the normally open contact (note -this supply may only be available when Ign or Acc sw is on).
If power supply is ok at the relay contact, check control input to relay operate coil.
If a ground (or 12v) operates the relay, operate the relay with a local ground (or 12v) and check blower motor runs.
If all above OK, check control signal from fan switch is arriving at the relay control coil.- if not trace wiring back to the switch.
SOURCE: 1999 Cadillac Deville Heater Blower motor has
make a jumper cable up from lamp cord (from any Hardware store) and power up the blower motor from the battery
SOURCE: 1999 buick century heater blower
Can you possibly post a picture of this?This sounds like something that was added for add on equipment. As far as the blower motor goes try wiggling the plug that is connected to the blower motor or tapping on the bottom of the blower motor to see if it will turn on.The most common issues with an inoperable blower motor is the pigtail plug or the blower motor itself.Were you able to verify that the fuse is ok?The 2 wires that go to the blower motor should an orange and a black one. I'm going to post a the wiring diagram for the manual HVAC system.If this is automatic please let me know the diagram is a little different for the Auto HVAC.
Please feel free to ask any questions.Will try and assist you best as possible.
337 views
Usually answered in minutes!
×