New STS UK Owner with a few problems
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  • 1 Post By Submariner409
Cadillac Seville / Cadillac Eldorado Forum Discussion, New STS UK Owner with a few problems in Past Cadillac Vehicle Discussion; Ok i have just bought my first Cadillac..a 98 Cadillac Seville STS 4.6 Northstar V8. I picked it up for ...
  1. #1
    schhokar is offline Cadillac Owners Member
    Automobile(s): Cadillac Seville STS 4.6 V8 UK Spec
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    Unhappy New STS UK Owner with a few problems

    Ok i have just bought my first Cadillac..a 98 Cadillac Seville STS 4.6 Northstar V8.

    I picked it up for a tidy 800 pounds and was meant to just be a run around at that price but i'm starting to really like it

    When it starts up I get the "service stability system" and "service suspension system" messages. I have done my research and pulled the codes..but apart from normal OBD codes I dont know the meanings of rest..

    Could someone please help me out and advise how to fix the problems as with the ABS and traction control lights on it will fail its MOT..

    I cleared all codes and drove around..
    The codes are

    RSS C1783 current
    RSS C1782 History
    RSS C1761 History
    RSS C1711 Current
    MSM U1255 History
    RIM B1009 Current
    PCM P1520 History
    PCM P1189 Current
    IPM B1652 History
    AMP U1064 History
    ABS C1242 Current


    Any help will be much appreciated as I cant find ANY Cadillac specialist in the U.K

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  3. #2
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: New Seville STS UK Owner with a few problems



    A link to the code definitions will be found in the DTC Sticky at the top of the forum page. You want the OBDII link.

  4. #3
    schhokar is offline Cadillac Owners Member
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    Re: New Seville STS UK Owner with a few problems

    Hi Thanks..I think the "RSS MSM etc" confused things for me...

    Here are the definitions
    DTC C1783 ICCS2 DL Left Output Short CKT to GND
    DTC C1782 ICCS2 DL Left Output Short CKT to Bat
    DTC C1761 RF Position Sensor Input Fault
    DTC C1711 LF Damper Actuator Short CKT to Ground
    DTC U1255 Class 2 Communication Malfunction
    DTC U1255 Serial Data Line Malfunction
    DTC B1009 EEPROM Checksum Error
    DTC P1520 Transmission Range Switch Circuit
    DTC P1189 Engine Oil Pressure (EOP) Switch Circuit
    DTC B1652 Loss of Keep Alive Memory (KAM)
    DTC U1064 Loss of Communications with DIM
    DTC C1242 Pump Motor Circuit Open

    There you go guys...any ideas? Seems like its all electrical? I just want to get rid of the ABS and TC lights. And the stability and suspension service warnings. Also I'm limited to 90..which isnt too bad but would prefer not to have it!

  5. #4
    DJP1990 is offline Cadillac Owners Member
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    Re: New Seville STS UK Owner with a few problems

    Hi and welcome!

    We still need the modules from which these codes originated from. Just like the "RSS, MSM, etc". Those are the modules

    Have you tried resetting all the codes?


    Whoops! Misread the first post! Good luck and be prepared to make tough desiccions...

    Cheers!

  6. #5
    JimD is offline Cadillac Owners Connoisseur
    Automobile(s): '98 STS (RIP @ 206,xxx), '04 DTS & the witch driver gone.
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    Re: New Seville STS UK Owner with a few problems

    Quote Originally Posted by schhokar View Post
    ....When it starts up I get the "service stability system" and "service suspension system" messages. I have done my research and pulled the codes.

    Could someone please help me out and advise how to fix the problems as with the ABS and traction control lights on it will fail its MOT.

    I cleared all codes and drove around..
    The codes are
    RSS C1783 current = ICCS2 DL Left Output Short Circuit to GND

    RSS C1711 Current = Left Front Damper Actuator Short Circuit to Ground

    RIM B1009 Current = EEPROM Checksum Error

    PCM P1189 Current = not a valid code. Typo? EDIT: it was my typo. You have the definition.

    ABS C1242 Current = Pump Motor Circuit Open

    Since C1242 is your MOT inspection concern we can start there. This code refers to the (hydraulic) pump motor that is part of the Electronic Brake and Traction Control Module and that module is located at the bottom front left hand corner of the engine cradle. A frequent cause of C1242 is a damaged oxidized corroded chassis ground wire that exits the side of the pump motor and is bolted to the engine cradle. Removing enough engine air flow management panels to allow access to the EBTCM will be necessary. It would be worth the trouble to install a redundant ground as a test.

    C1711 is the cause of SERVICE SUSPENSION SYS message and is indirectly responsible for C1783 and is bad news for the solenoid coil that adjusts the damping rate of your struts. The original factory installed parts are no longer available but there is an aftermarket part available in the US from Monroe. Smart money would replace both struts to avoid different damping rates at the corners. As a temporary patch while you decide if the car is worth the cost of having struts shipped from the US plus possible labor to install, you can prevent the message by installing a 4.7K Ohm, 1/2 Watt resistor in the chassis connector as a substitute for the strut solenoid.

    Bonne chance.

  7. #6
    schhokar is offline Cadillac Owners Member
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    Re: New Seville STS UK Owner with a few problems

    Problem is I believe the ABS and TC lights will stay on untill the service suspension and service stability warnings are fixed aswel?

  8. #7
    JimD is offline Cadillac Owners Connoisseur
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    Re: New Seville STS UK Owner with a few problems

    Quote Originally Posted by schhokar View Post
    Problem is I believe the ABS and TC lights will stay on untill the service suspension and service stability warnings are fixed aswel?
    Wrong.

  9. #8
    schhokar is offline Cadillac Owners Member
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    Re: New STS UK Owner with a few problems

    Ok any sort of guide on the abs fix? Also where about do I put a resistor and any guide on that?

    I take it definitely needs a new front shocker? I can get the parts over here I believe but need to know what to get. The previous owner did mention he had replaced the front shock absorbers..could this be a cause

  10. #9
    Submariner409's Avatar
    Submariner409 is offline If it won't run, slap in a big stereo
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    Re: New STS UK Owner with a few problems

    Your front struts and rear shocks are active - solenoid controlled orifices, reacting to a large number of different sensor inputs, modify fluid flow for body control. The system "sees" a resistance load as it operates. A 4.7K Ohm resistor mimics the solenoid load. That resistor is inserted into the body harness connector to the strut/shock wiring pigtail exactly the same as plugging a bent paper clip into a wall socket (!!!). Insulate/weatherproof the installation.

    I believe it would be best to "fool" both front strut sensors in order to equalize suspension control attempts by the system.

    Here's a heads-up: Your UK-sold motor vehicle is assigned a "model year" based on its date of original sale. In the U.S. "model year" is the dates of the production run: In the case of a "1998" Seville that runs from 08/97 to about 06/98. You need to calculate your actual model year from the date on the driver's door sticker - a date code like 00/00. Parts and diagnosis are based on the U.S. model year ...........

  11. #10
    schhokar is offline Cadillac Owners Member
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    Re: New STS UK Owner with a few problems

    Do I need to put resistors in the rears aswel? Or just front?

  12. #11
    Submariner409's Avatar
    Submariner409 is offline If it won't run, slap in a big stereo
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    Re: New STS UK Owner with a few problems

    If the shocks are not faulty there's no real sense in disabling them......... and those shocks serve two functions: Suspension control and rear height control - two separate systems.

    The rear shock/suspension control is the same as the struts - sensors control hydraulic fluid flow rate to damp body motion due to road/speed/maneuvering conditions. Height control is by sensors attached to the rear control arms, a signal sent to a compressor/air line/ shock bladder system to compensate for extra weight in the trunk or rear seat. (There is no front height control.)

    The two systems are not dependent on one another - either functions stand-alone, and both are separately monitored for faults.

    You might want to look into a subscription to www.alldatadiy.com - the entire GM service manuals plus a LOT more information.
    70eldo likes this.

  13. #12
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