Ford

Have Ford Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Ford

OK I'm going to take a chance here as one tech before told

Customer Question
me to do evrything I...
OK I'm going to take a chance here as one tech before told me to do evrything I had done, then posted pictures from the service manual of pinpoint tests(which I already have) and said take it to the dealer which I explained was 150 miles away. Here is what I have done and what's going on. First I had the switch light on all the time. I replaced all the sensors and then the speaker. The speaker made the light go off. The 2 inside sensors work, the 2 outside ones do not. I replaced the outside ones, same thing. I switched the inside sensors to the outside with the same result--inside work-outside do not. I replaced the PAM--no change. I replaced the switch, no change. I replaced the wiring harness to the sensors-no change. The drivers outside sensor will go off momentarily if I stick my finger over it for a few seconds. The outside sensors do tick. I've looked around for pinched wires, broken wires, etc with no luck. On a general OBD II scan no codes. I have an Auto Enginuity scanner that hooks to a laptop and will scan the parking system abs, etc. It comes up with the message that it cannot communicate with the parking module. As you might guess, I am about to pull my hair out.
Submitted: 2 years ago.Category: Ford
Show More
Show Less
Ask Your Own Ford Question
Answered in 5 hours by:
8/2/2015
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 49,126
Experience: 16 years experience
Verified

Let me know if you need the wire diagrams for this circuit. A no communication concern indicates the module is bad, or has wiring issues on the power or ground or communication wires. Have you tested those with a volt ohm meter?

You want a excellent 5 star answer & I would like to be rated the same for providing it. Consider I don't know your skill level & I can't see, smell, hear, or touch the vehicle. It may take a few back and forth replies. Try your best to respond with good detail so I can do the same. I normally log in at 3pm and work late. A rating is required. Your rating me, what I type. I am not an employee of this website, nor have control over the fees or the time it took to get a response. If you rate negative or not at all you still paid, but I get nothing. I want you pleased with me and my efforts, so let me know if your experience here has come up short.

Thanks Chris

Ask Your Own Ford Question
Customer reply replied 2 years ago
I have wiring diagrams and the full service manual. Since I replaced the parking module with the new one and I have the exact same symptoms present, I took that as pretty good evidence (though not 100%) that it is not the module. I am obviously getting power to all the sensors since they tick. My reasoning is that I'm not getting a return signal or at least not enough to complete the alarm circuit in the module or the module is not getting enough power. The fact that I can put my finger over the driver outside sensor and it will eventually beep--but only for a second or so, makes me think there is a bad ground. I have searched all over the place. I bought this truck in Nov 14 and it was from New york. I bought it online so I didn't know about the rust which I have pretty much removed and repaired. I found a grounding strap rusted through on the rt side which I replaced but have found nothing else. I have checked the fuse which is ok and would be as I expect since there is power in the circuit as the 2 inside sensors work properly. I am having difficulty testing the wiring harness where it connects to the PAM. I have 3 voltmeters and all the probes are too big to touch the pins in the connector. I have taken a piece of copper wire and placed in the connector site I want to check and then use that as my contact point. I also pulled the connector in the tailight just to be sure there was no corrosion, etc since that connector branches off to eventually give power to the sensor wiring harness. Then I get this module communication error with this scanner. And since the module, switch, pam, and speaker have all been replaced, all that leaves me with is wiring-correct? I have pulled off the step plates on the carpet at the bottom of the doors and find no pinched or broken wires. I have done all this on the passenger side since that is where all the wiring leads. According to one diagram, there is supposed to be a ground from the license plate/trailer hitch circuit to the driver side frame rail. Of course, the spot it would be at is right where the gas tank is against the frame rail. I have felt up there but I do not feel any wire or grounding bolt there and there is no junction on the wiring I can find where it would split off to connect to a grounding point anyway. The wiring as it goes forward on the driver's side seems intact and undamaged which I would also expect since it attaches at one point to the fuel tank unit and I would assume I would have issues with gauges, fuel pump or something.My skill level is this;I am a dentist so I am good with my hands, think very logically as to cause and effect, and I catch on quickly.My dad taught me a fair amount of things about cars growing up and I am mechanically inclined. This is my second Excursion and they have been my hobbies as well as primary driver. I had a minor in physics in college so I can read wiring diagrams some but not as well as I would like. I can use a volt meter fairly well though I am not an expert. For example I'm having trouble wrapping my head around one of the point tests where you test resistance between pin 3 circuit 57 on the harness and against a ground...doesn't make sense to me. The biggest mechanical job I've done is I replaced my front leaf springs by myself. I do brakes , I've put in stereos and amps.etc. Basically I've been able to eliminate a lot of potential issues but testing the wiring--especially since I got the communication error from the scanner-has got me stumped.
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

The CKP is used for the ignition spark. The CMP is used for injector pulse. The CMP does not effect the fuel pump relay, the PCM and VLCM does that. Can you verify the PCM is grounding the VLCM with the key on. Below is a diagram if needed.

Ask Your Own Ford Question
Customer reply replied 2 years ago
I believe you sent this to the wrong person
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

That I did, that was for the previous customer I was helping and for some reason it sent it to both of you.

Ask Your Own Ford Question
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

Lets not chase wiring all over the vehicle. Slide a paper clip in beside the power and ground pins at the PAM so you can connect your tool there and see if you get battery voltage and no resistance to ground. Then we can follow the wiring if either of these fail. Can you do that?

Ask Your Own Ford Question
Customer reply replied 2 years ago
You are talking about power and ground on harness correct? Make a u shaped connector out of a paper clip and connect power and ground--then measure voltage. across the clip??. I know setting resistance on the meter but where do I put the probes checking resistance for the ground. This is the one that gave me a conceptual problem. Easy to measure resistance at either end of a piece of wire, I get that. If I measure resistance between power and ground with a clip, Im getting the resistance of the paper clip aren't I?
Customer reply replied 2 years ago
this is what I got:
Harness to ground on body boltThis is what I could measure following my diagnostic sheets so far.Pin 1 (Voltage) 11.1 volts
Pin 9 (Voltage) 9.67 to 9.77 volts measured several times 2 different multimeters
Pin 3 (Resistance) .5 ohms-also checked multiple times with 2 multimeters
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

I am talking about power and ground at the connector on the PAM. The paper clip is straight slide in beside the power pin for the first test then beside the ground pin for the next test.

Pin 1 LB/BK is supposed to be battery voltage

Pin 3 BK is supposed to have no resistance to another ground pint.

The first wire coming out of the harness at the PAM, when following it from the PAM connector, is going to be the ground for the PAM.

Ask Your Own Ford Question
Customer reply replied 2 years ago
U see my readings?
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

Pin 3 was the only one out of specs form your readings.

Ask Your Own Ford Question
Customer reply replied 2 years ago
what do I do now?
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

Remove that ground connection, and sand it and retest. It needs to have 0.0 ohms of resistance on this ground wire to another ground location.

Ask Your Own Ford Question
Customer reply replied 2 years ago
Do I pull it out of the connector?
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

You unbolt it from the body where the ground for the PAM comes from.

Ask Your Own Ford Question
Customer reply replied 2 years ago
Where the heck is that----I've been trying to figure that out?...or can I splice on to the ground wire out of the connector and run a new ground wire to something??
Customer reply replied 2 years ago
OK but you don't know where the grounding bolt is??
Customer reply replied 2 years ago
Everything is wrapped in that binding tape
Customer reply replied 2 years ago
I followed the ground which is not present at the tailight connector harness. There is one place I see it going up to the speaker-which works. The wiring diagram I have says the ground is at the right rear corner of the vehicle which I have yet to see.The split going the other way runs under the big trim panel to the rt rear door which I'm not chasing since I've already pulled the door plates. Since the 2 inner sensors work that tells me the wiring to those is fine. What must be a problem is the wiring that is common to the outer sensors but not the inner--correct? the switch operates--simple on/off power to the system. Pin 3 on my troubleshooting guide says resistance has to be < 5 ohms which it is... .5 ohms. Pin 9 to ground is < 10 volts which it then says to repair circuit 140--which I have no clue what that is. Pin 9 is labeled "reverse input" going to exterior light system--I assume backup lights--all lights work. I think I am ready to shoot the PAM with my .45. This is insane
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

I posted an image pointing to where the ground wire is bolted to the body.

Circuit 140 BK/PK goes to the TR sensor and its the power that tells the PAM when your in reverse.

Ask Your Own Ford Question
Customer reply replied 2 years ago
I promise you there is no bolt and there is no ground at that point. The harness wiring joins with 4 other sets of wires. One is a ground to the back of the blower motor--best I can feel.That one is about twice the guage as the others feeding into the junction. I don't suppose they would ground to the back of the blower motor would they??? One goes to the tailghts, one goes to the power point and one goes forward under the plastic panel. That's it. I have a picture but I can't paste it. The junction looks just like the diagram--there is just no ground wiregoing to a grounding bolt
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

I am just not seeing any progression occurring between you and I and this vehicle. We are pretty much stuck without a scan tool. I think its best I opt out and let someone else give this a shot. Best of luck and Thanks for letting me try.

Ask Your Own Ford Question
Customer reply replied 2 years ago
someone else will contact me?
Customer reply replied 2 years ago
remember I have a scan tool that reads the parking module, abs, etc--AutoEnginueity scanner that works through my laptop-not one of those chinese trinkets. It says it cannot communicate with the module.
Customer reply replied 2 years ago
Thanks for trying
Customer reply replied 2 years ago
Bought the X in Nov. Back up on/off switch light was on. A 4 sensors seems bad--no ticking Replaced all 4 sensors--light still on, not working. Replaced the speaker, light goes off and the 2 center sensors work, the outer ones do not. I swapped them inside to outside, same deal so all 4 sensors are good--verified with a conductance wand. Thought it had to be the PAM. Found a used one. Ordered it, put it in, exactly the same result--inside works, outside do not.I replaced the on/off button. I replaced the bumper harness to the sensors with a new one-same result.I bought an Auto Enginuity Scanner which will read the parking module and several other expanded circuits as I paid extra for those options. When I run the scanner, everything checks out EXCEPT it says "cannot communicate with parking module". I did discover if I put my finger over the driver side outside sensor for a few seconds it will beep----once. I checked the power pin in the PAM connector--10.77 volts. Measured twice with 2 different multimeters. Resistance on ground wire is .5 ohms. That's where I am at
Customer reply replied 2 years ago
Also, I have tried to find the grounding bolt but it is nowhere that I can find
Ask Chris (aka- Moose) Your Own Question
Chris (aka- Moose)
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 49,126
49,126 Satisfied Customers
Experience: 16 years experience

Chris (aka- Moose) is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

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:

AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on.

Rich DUSA

Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me.

MollyUSA

I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service.

Jason V.Kirkland, WA

I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there.

BRNew Jersey

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 PElm 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.

PhilMarysville, CA

< Previous | Next >

Meet the Experts:

Ron

Ron

ASE Certified Technician

24,155 satisfied customers

23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

Chris (aka- Moose)

Chris (aka- Moose)

Technician

49,126 satisfied customers

16 years experience

John Mc

John Mc

Ford Technician

5,495 satisfied customers

19 years Ford Lincoln Mercury experience

Chuck

Chuck

ASE Certified Technician

1,685 satisfied customers

33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance

Cam

Cam

Journeyman Automotive Technician

10 satisfied customers

GM Grand Master Technician 2007. 14 years Automotive experience.

Richard

Richard

ASE Certified Technician

1,524 satisfied customers

12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.

Mike V.

Mike V.

Auto Service Technician

1,335 satisfied customers

25 years experience on all makes and models, Licensed NYS Inspector.

< Previous | Next >

Related Ford Questions
2012 mustang. Blower motor runs for a little while and then
2012 mustang. Blower motor runs for a little while and then slowly dies. It's like it loses power over a minute or two. Sometimes it surges without completely dying. After it dies, it won;t come back … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Just replaced blower motor on a 2002 F350 and getting no air
Just replaced blower motor on a 2002 F350 and getting no air movement out of the vents at all checked for any obstruction and did not see anything I haven't found any vacuum lines that are disconnecte… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
Blower motor won't work, checked fuses and replaced
Blower motor won't work, checked fuses and replaced resistor … read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
My 2007 Navigator EATC blower motor runs constantly on high
Hi Richard. My 2007 Navigator EATC blower motor runs constantly on high speed whenever engine is running. Temperature control seems to work perfectly as heat and AC operate as they should. Using the o… read more
davehop
davehop
Diagnostic Technician
Ford Master Certified Technician
1,171 satisfied customers
2010 F150 blower motor does not run. I do not have power to
2010 F150 blower motor does not run. I do not have power to any pin on resistor plug. No blown fuses found. … read more
Mike V.
Mike V.
Auto Service Technician
High School or GED
1,335 satisfied customers
Blower motor doesnt work, I can wiggle wires over the fuse
blower motor doesnt work, I can wiggle wires over the fuse box in the passenger floor board and sometimes it will come on, it may work for days or sometimes just seconds … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
08mustang gt blower motor stops and starts while driving. No
08mustang gt blower motor stops and starts while driving … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
My 2010 f150 blower motor heat/ac is not working, fuses are
my 2010 f150 blower motor heat/ac is not working, fuses are fine checked wire connectors ok advise please? ed … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
Blower motor stopped working. relay & fuses good, 189k, 2000
yes, checked all related fuses and replaced blower motor relay … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Just replaced the blower motor and relay on my 2010 Ford
Just replaced the blower motor and relay on my 2010 Ford Crew Cab F150 at my local Ford Dealership, now the fan blows but the air is not cold like it was before the blower motor went out. The electric… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
49,126 satisfied customers
Trouble with blower motor, 240000 km, so i guess around
240000 km, so i guess around 150000 miles manual tranny … read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
Replaced blower motor, radiator fan assembly with module,
replaced blower motor, radiator fan assembly with module, now AC is not getting as cold as it used too. And it is not consistant with temp and electric issue just started today with it almost shutting… read more
6Bucs
6Bucs
Senior Master Tech
Associate Degree
3 satisfied customers
Blower motor is humming, vibrating. Will run barely but
Blower motor is humming, vibrating. Will run barely but changing fan speed does nothing. Did it a couple of times last year but I could shut it off and restart the truck and it was fine. … read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
49,126 satisfied customers
2004 Taurus. The blower motor is heard running strong, but
2004 Taurus. The blower motor is heard running strong, but no air is coming out of the vents.… read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
How to access the blower motor resistor for 2015 f350, Not
How to access the blower motor resistor for 2015 f350 … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,155 satisfied customers
Blower motor for a/c not working in the front. 2007 ford
blower motor for a/c not working in the front. 2007 ford expedition. was intermitten but now nothing … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
2010 Ford Expedition intermittent front blower motor
2010 Ford Expedition intermittent front blower motor operation. no control with manual control, and not when in auto either. Verified motor is operational, and problem seems to be in the controls. Whe… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
3,938 satisfied customers
Replaced the blower motor resistor and the fan still will
replaced the blower motor resistor and the fan still will not work - where is the blower mtor in my 2010 F 150 so I can replace that … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x