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 Bob Your Own Question

Bob
Bob, Auto Service Technician
Category: Car
Satisfied Customers: 4087
Experience:  40 year GM Tech. +30 Certified. ASE Master Tech.(expired, retired) Medium Duty, Heavy Line, Retired
2210118
Type Your Car Question Here...
Bob is online now
A new question is answered every 9 seconds

Checked fuses inside and under hood - found nothing obvious

Resolved Question:

Is there a fuse or something simple I might have overlooked that could cause this not to work. Checked fuses inside and under hood - found nothing obvious.
Submitted: 7 years ago.
Category: Car
Expert:  Bob replied 7 years ago.

You will need a class 2 scanner capable of running function tests to find the problem. Because the system is run through the body control module,there is little that can be tested with a 12 volt test light or a volt meter. A regular code reader won't do it as function tests need to be run on the system to find the failed component. I am enclosing the GM test procedure for you to take a look at, it may help and give you some ideas, but without the class 2 scanner it will be an up hill battle. Note, the blue high lights will not open for you, they are GM access only, thanks.

Customer: replied 7 years ago.
Reply to Bob's Post: Nothing attached?? So there is no fuse for that system that I missed? I push the tow/haul button and no light on the dash comes on, and there is no change in trans performance. Would like to check all the simple stuff first before I have to buck up and go to the dealer. Any other reccomendations appreciated. Thx.
Expert:  Bob replied 7 years ago.
Hi Carlie, I thought I sent you some info last night, but I see this morning that the system did not let it go through. I am going to have to copy and scan the info and then send it to you. It is 4 pages, so will have to send in 4 separate posts. Note the blue high lights will not open for you. You may want to recheck fuses number 5 & 6 in the instrument panel fuse box, they both work part of the body control module, but if the power windows and radio and stuff work I doubt we will find a problem there. The only other component is the trans harness, but that comes in after the tow haul switch and if the trans is working okay, I doubt that also will show any problem. You may want to check the wiring going to the switch, the power goes in on the blue wire and out to the trans on the black. Hope some of this helps, but with the new computer systems, they sure did not make it e-z to test anything. Look for more posts. Thanks
Expert:  Bob replied 7 years ago.
graphic
Expert:  Bob replied 7 years ago.
graphic
Expert:  Bob replied 7 years ago.
graphic
Expert:  Bob replied 7 years ago.
graphic
Customer: replied 7 years ago.
At the risk of sounding dumb - help me out with fuses 5&6 - found no numbers labeling them?
Expert:  Bob replied 7 years ago.
Really sorry, GM does some dumb things and I almost wish I could apologize for them sometimes. They should say BCM on them. Will see if I can find a picture of it or something and send, no promises, you would not believe how bad the manual can run you in circles sometimes.
Expert:  Bob replied 7 years ago.

Sorry, may be under the hood, GM isn't very specific.


Object Number: 399920  Size: MF

Customer: replied 7 years ago.
Reply to Bob's Post:

The fuses 5 and 6 are labeled IGN0 and CRUISE (they are OK). See image. I have an appt at the Dealer this afternoon, was hoping to avoid that with a simple fix. Found nothing in dash or inder hood labeled BCM.

graphic

Expert:  Bob replied 7 years ago.
Thanks for the photo Charlie, wish GM could do as good a job in the service manual. Yes, I knew what else they controlled, not labeled that way in the manual, the thought was that these items are also controlled by the BCM and there was a slight hope that one of these circuits would maybe have a problem. Wish there was something easier that I could tell you to check, but I am afraid the dealer is going to be your best bet. Systems sure are not what they used to be, battery, switch and motor, etc. I really hope it is an e-z fix for you and not too spendy, but at least with the dealer doing the work, you will have them to fall back on if you have other problems down the line. Good luck with it and thanks for giving us a try.
Bob, Auto Service Technician
Category: Car
Satisfied Customers: 4087
Experience: 40 year GM Tech. +30 Certified. ASE Master Tech.(expired, retired) Medium Duty, Heavy Line, Retired
Bob and other Car Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician
 
 
 
Chat Now With An Auto Mechanic
Bob
Bob
Auto Mechanic
4087 Satisfied Customers
40 year GM Tech. +30 Certified. ASE Master Tech.(expired, retired) Medium Duty, Heavy Line, Retired