This link below says gray wire is the control signal for the fan.
https://www.youtube.com/watch?v=EEExGlim5Eo
interesting comment about the programmer controller which also controls fan. Below
https://www.youtube.com/watch?v=SR41ZrEekRs
The link below says the gray wire comes form the programmer which controls the blower.
https://www.2carpros.com/questions/cadillac-deville-1999-cadillac-deville-no-air-coming-through-vents
Found this info on how 97 programmer works below
https://www.cadillacforums.com/threads/97-eldorado-blower-motor-doesnt-work-any-ideas-to-test.184591/
SOURCE: Climate Control Blower motor stopped working
I had the same problem with my 2000 Mercury Grand Marquis. I ended up replacing the blower and the resistor which is on the passenger center side of the firewall tucked in where it is hard to get to. Everything worked fine for about two years. It just went out again here about a month ago. I am going to try to replace the resistor again, but I am wondering if it doesnt have something to do with the climate control switch. I do not want to replace the same part every year or two, so if anyone has a idea of what could possibaly be the bigger problem, please let me know.
SOURCE: 2004 Dodge Dakota
Replace your resistor if you haven't already. I had the same issue with mine, it only worked on high.
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: 1999 contour heater blower doesn't work i
on blowermotor ground ground wire to a go metal ground and see if motor runs if it does then you have a bad ground. also try tapping on motor if it turns on then replace motor,hope this helps.
Testimonial: "gave me good ideas unfortunitly no luck"
438 views
Usually answered in minutes!
×