Park Assist Down
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Cadillac STS Forum - 2005 through 2012 Discussion, Park Assist Down in Past Cadillac Vehicle Discussion; Hopefully someone can help me find and repair/replace the Park Assist mode/module on my STS4 N* 1SF. Just like other ...
  1. #1
    Neutrocuted's Avatar
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    Park Assist Down

    Hopefully someone can help me find and repair/replace the Park Assist mode/module on my STS4 N* 1SF. Just like other items that have broken down on this car, it started off being an intermittent problem then escalated to fully non-functioning. When it worked I could hear the audible and see the yellow and red lites. As it began to stop working either both audible and visual worked sometimes or both would not work. Never one or the other. Now... nothing.

    It worked so flawlessly for so long. Backing into the garage was perfect every time.
    These cars have a way of spoiling a person. When I drive the ole lady's older E class it seems like a real pain to use the key! Something I use to just accept as a function of driving that I no longer had to deal with. The when you have to deal with it, it seems like such an imposition!

    I really need my park assist and will have it fixed (if it's not too expensive)... I just would rather do it myself.

    Thanks guys!

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    1BadCadSTS's Avatar
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    Test for power.

    If there's power to the module and no lights or sounds you cannot put it into diagnostic mode and almost always is the urpa module.

  4. #3
    Neutrocuted's Avatar
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    Re: Park Assist Down

    Thanks for the response, I really appreciate it, but... kindda cryptic for an uninformed guy like me. I know some of the basic stuff about these cars but when it comes to the S&M and the F'in/M I get a little lost! Could you go into depth a little? Like, where's & what's the urpa and how to test it for power??? Do I ask Chris At Rippy for an urpa and he'll know what I want? ...and, how do I put it in diagnostic mode???
    No kiddin', Thanks again!

  5. #4
    1BadCadSTS's Avatar
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    If its not lighting up you cannot put it in diagnostic mode

    URPA
    Ultrasonic
    Rear
    Parking
    Assist

    Module is in the trunk under the rear window shelf, remove the upper inside liner you will see 3 modules the Remote Control Door Lock Receiver (RCDLR), Rear Integration Module (RIM) and Rear Object Sensor Control Module or URPA. The URPA is the SMALLEST of the 3 with only 1 connector plug. Trace the wiring and you will see an open single pin plug, that is the URPA diagnostic connector which is spoken below.


    Diagnostic Trouble Code (DTC) Displaying

    This vehicle is equipped with an on-board diagnostic display feature capable of displaying diagnostic trouble codes using the 3 indicators on the rear parking assist display. After the bulb check has been completed, the red outside indicator flashes to indicate a malfunction with the system. The module disables operation of the URPA system under this condition.

    In order to enter the diagnostic mode, complete the following actions:
    •With the ignition turned OFF, short the rear parking assist diagnostic connector to ground while the vehicle is in PARK. Refer to Rear Parking Assist Component Views for the location of the rear parking assist diagnostic connector.
    •Turn the ignition ON.
    •Place foot on the brake.
    •Shift the vehicle into REVERSE within 5 seconds.
    If the vehicle is not shifted into reverse within 5 seconds after turning the ignition ON, the diagnostic mode will still be initiated. However, a reverse input wiring fault will be registered as sequence #7 as shown in the Diagnostic Indicator table below. Refer to Diagnostic Trouble Code (DTC) Clearing for specific steps on how to clear diagnostic trouble codes. After the reverse input wiring code is cleared, repeat the diagnostic trouble code displaying steps in order to enter the diagnostic mode.
    When the diagnostic mode is first entered, the rear parking assist display displays the amber outside indicator and the red outside indicator. Then the indicators on the rear parking assist display will display one or more of the sequences in the table below to indicate where the fault exists within the rear parking assist system. Refer to Diagnostic Trouble Code (DTC) Clearing for the specific steps on how to clear diagnostic trouble codes.



    #


    State/Fault Location


    Amber Outside


    Amber Middle


    Red Outside


    Flashing


    1

    Start of Diagnostics

    X

    --

    X

    --


    2

    RR Corner Object Sensor and Wiring

    X

    --

    --

    --


    3

    RR Middle Object Sensor and Wiring

    X

    X

    --

    --


    4

    LR Middle Object Sensor and Wiring

    --

    X

    X

    --


    5

    LR Corner Object Sensor and Wiring

    --

    --

    X

    --


    6

    Chime Warning Wiring

    --

    X

    --

    --


    7

    Reverse Input Wiring

    --

    X

    --

    X


    8

    Sensor Supply Voltage Circuit and Sensor Low Reference Circuit

    Sensor Supply Voltage Circuit and Sensor Low Reference Circuit

    Important: This diagnostic pattern sets for an open sensor supply voltage circuit and sensor low reference circuit.

    X

    X

    X

    X

    Flashes in the following sequence:
    Amber Outside
    Amber Outside and Amber Middle
    Amber Middle and Red Outside
    Red Outside


    9

    Sensor Supply Voltage Circuit

    Important: This diagnostic pattern sets for a short to ground in the sensor supply voltage circuit.

    X

    X

    X

    --

  6. #5
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    Re: Park Assist Down

    WOW!!!

    I didn't expect that, but that's exactly what I was talkin' about! You definitely rock !

    Thank you. I'll let you know how I make out!!

  7. #6
    Guy.Seminerio is offline Cadillac Owners Connoisseur
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    Re: Park Assist Down

    1bad cad what manual do you use?

  8. #7
    1BadCadSTS's Avatar
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    GM techline

    Helps to have an uncle who is the parts manager at a major GM dealer.

  9. #8
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    Re: Park Assist Down

    i think my alldatadiy subscription has that same info about the URPA

  10. #9
    Guy.Seminerio is offline Cadillac Owners Connoisseur
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    Re: Park Assist Down

    Alright thanks

  11. #10
    atlrus is offline Cadillac Owners Fanatic
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    Re: Park Assist Down

    Before you delve deeper into it - make sure that the sensor connections are clean. Lot's of URPAs on the Escalade went off because of the dirt being slung on the connections. Not sure how it is on the STS, but worth a look.

  12. #11
    Neutrocuted's Avatar
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    Re: Park Assist Down

    When I shift into reverse I get nothin'. No lights at all. When it worked the red lite would blink once. But when I leave today I will give all the sensors a good wipe. Found the module for $75. The sensors in the bumper retail for $303 ea. online!

  13. #12
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    Re: Park Assist Down

    Quote Originally Posted by Neutrocuted View Post
    When I shift into reverse I get nothin'. No lights at all. When it worked the red lite would blink once. But when I leave today I will give all the sensors a good wipe. Found the module for $75. The sensors in the bumper retail for $303 ea. online!
    The sensor connections are actually behind he bumper. If you can get to them - unplug them and use some electr. parts cleaner.

  14. #13
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    Re: Park Assist Down

    I recommend using dielectric grease on reassembly. It's great for fussy connections.

  15. #14
    Neutrocuted's Avatar
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    Re: Park Assist Down

    Quote Originally Posted by Ludacrisvp View Post
    i think my alldatadiy subscription has that same info about the URPA
    I tried to find it in alldatadiy and couldn't find it stated like what 1Bad states above. I'm new to alldatadiy and I was wondering if you may have seen it under another path. The path I used was Vehicle » Relays and Modules » Relays and Modules - Accessories and Optional Equipment » Parking Assist Control Module . From that point it seems all the links lead out of the » Parking Assist Control Module area. Alldatadiy did give me the part number which is cool.

  16. #15
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    Re: Park Assist Down

    Try these?

    Vehicle » Accessories and Optional Equipment » Collision Avoidance and Parking Assist Systems » Description and Operation » Object Detection Description and Operation (RPA)

    Vehicle » Accessories and Optional Equipment » Collision Avoidance and Parking Assist Systems » Testing and Inspection » Symptom Related Diagnostic Procedures

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