How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask MCVGreg Your Own Question
MCVGreg, Master Troubleshooter
Category: Car
Satisfied Customers: 8857
Experience:  25 + Years Working with Cars & Electronic Control Systems
Type Your Car Question Here...
MCVGreg is online now
A new question is answered every 9 seconds

2000 pontiac grand prix: resistor..5 the lights come..blower motor

Resolved Question:

2000 pontiac grand prix.when i turn fan motor on my daytime running lights go out. Ive replaced resistor,daytime running light moldue,heater&ac control switch,blowermotor.The fan motor will not work on levels 1thru4,on 5 the lights come back on and the blower motor comes on . what else could it be.
Submitted: 9 years ago.
Category: Car
Expert:  MCVGreg replied 9 years ago.

Hello & Welcome,


This sounds like a very interesting issue.


From what you have said, I would suspect that there is a Ground issue. I have looked at the schematics for both the blower control and DRL (Daytime Running Lights) circuits, and they BOTH use a Ground circuit called G200. If the ground is not connected at the frame, and then connected through various wires and splices, then this kind of issue could happen.


Do you have a multimeter that you can use to make some measurements?



MCVGreg and 2 other Car Specialists are ready to help you