c1780 loss of steering signal
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 3 of 3
Cadillac Seville / Cadillac Eldorado Forum Discussion, c1780 loss of steering signal in Past Cadillac Vehicle Discussion; just posting as a reference for future searches, as when I searched I found very few resources. so I bought ...
  1. #1
    pimpincaddystyle is offline Cadillac Owners Member
    Join Date
    May 2004
    Posts
    33

    c1780 loss of steering signal

    just posting as a reference for future searches, as when I searched I found very few resources.

    so I bought my 1998 sts with the code present and I replaced the steering wheel position sensor just because im an idiot and I didn't troubleshoot it. wasted 200 dollars. I could not find the SWPS on any schematic, alldata and Mitchell, not under abs, steering, or suspension diagrams.. wtf..

    so the SWPS signal is received by the EBTCM and converted into a PWM signal which is sent to the RSS module. everything I read had mentioned the gray wire being the wire that sends that signal. so I focused on that.. found that I did have a PWM signal at the RSS module so I thought the module was bad... but I then I realized on the suspension schematic, there were two wires for the PWM between the EBTCM and RSS. checked the other wire(white) and of course it was open.. wtf so easy

    looking at the EBTCM connector while its plugged in, its the upper right most wire (white) that was open.. the gray wire is right below that. I ran a jumper wire to save the trouble of pulling everything apart.

    the warning is now off and I cant believe how much better the car handles. it really does make a difference..
    I read that the RSS will still operate but just ignore the SWPS signal.. but it really likes all its inputs..


    hope this helps someone ..

    ----------

    on that note I have my old one if anyone needs one...

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    ETC George is offline Cadillac Owners Member
    Automobile(s): '98 ETC that I love dearly
    Join Date
    Feb 2006
    Location
    Denver
    Age
    70
    Posts
    7

    Re: c1780 loss of steering signal

    Hello, I know it's been 10 years since your post but I'm having the same problem on my '98 ETC and wanted to THANK YOU for your input in the Caddie Forum. I have the advantage of owning an oscilloscope and I've checked the inputs to the RSS module. The SWP input to the RSS shows a pulse but when rotating the Steering Wheel the pulse width never changes.

    My dealer assured me the SWPS was operating perfectly so while troubleshooting, I feel like I'm banging my head against the engine block !!

    It sure would be nice if GM would cough up the waveforms for these signals and all other as well !!

    ETC George

    ----------

    Sorry, I meant 1 year, not 10 years.

  4. #3
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): Crimson 2001 Seville STS, 1990 Seville (RIP)
    Join Date
    Sep 2010
    Location
    East Boston MA.
    Age
    26
    Posts
    20,501
    Quote Originally Posted by ETC George
    It sure would be nice if GM would cough up the waveforms for these signals and all other as well !!
    I highly doubt they have them, and there would be no need. No shop tests automotive sensors with an oscilloscope.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting