Park assist sensors

Tiny
U7616
  • MEMBER
  • 2004 CADILLAC ESCALADE EXT
  • 95,000 MILES
My park assist sensors are failing. I was driving and put it in reverse and only the red light came on with no sound. I drove to my destination and back home. Put it in reverse and all lights came on with sound, but nothing behind me. I need your help. Is there a youtube as to how to check, remove and repair the sensor? If not, can you assist with my issuers how to solve my concerns?
Thanks
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Monday, February 18th, 2013 AT 2:41 PM

3 Replies

Tiny
HMAC300
  • CERTIFIED MECHANIC
First I would check the sensor eye to see if you have a bit of dirt or mud over one of them. Here are diagrams to help you see how to replace the sensors.

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers
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Monday, February 18th, 2013 AT 3:31 PM
Tiny
U7616
  • MEMBER
Since I do not have a scanner to detect codes, how do I physicial check the one that's bad?
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Monday, February 18th, 2013 AT 5:31 PM
Tiny
HMAC300
  • CERTIFIED MECHANIC
I would do them all, here is a guide to help you test.

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:

1. With¬ the¬ ignition¬ turned¬ OFF, ¬ short¬ the¬ rear¬ parking¬ assist¬ diagnostic¬ connector¬ to¬ ground¬ while¬ the¬ vehicle¬ is¬ in¬ PARK.¬ For¬ the¬ location¬ of¬ the¬ rear¬ parking¬ assist¬ (RPA)¬ diagnostic¬ connector, ¬ refer¬ to Rear
Parking¬ Assist¬ Component¬ Views.
2. Turn¬ ON¬ the¬ ignition.
3. Place¬ foot¬ on¬ the¬ brake.
4. 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¬ the¬ 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.
Diagnostic¬ Indicators
# 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
Sensor¬ Supply¬ Voltage¬ Circuit¬ and¬ Sensor¬ Low X
Reference¬ Circuit Flashes¬ in¬ the¬ following¬ sequence:
Sensor¬ Supply¬ Voltage¬ Circuit¬ and¬ Sensor¬ Low
Reference¬ Circuit 1. Amber¬ Outside
8 X X X 2. Amber¬ Outside¬ and¬ Amber¬ Middle
IMPORTANT: 3. Amber¬ Middle¬ and¬ Red¬ Outside
This¬ diagnostic¬ pattern¬ sets¬ for¬ an¬ open¬ sensor 4. Red¬ Outside
supply¬ voltage¬ circuit¬ and¬ sensor¬ low
reference¬ circuit.
Sensor¬ Supply¬ Voltage¬ Circuit

9 IMPORTANT: X X X
This¬ diagnostic¬ pattern¬ sets¬ for¬ a¬ short¬ to
ground¬ in¬ the¬ sensor¬ supply¬ voltage¬ circuit.
DIAGNOSTIC¬ TROUBLE¬ CODE¬ (DTC)¬ CLEARING

The¬ rear¬ parking¬ assist¬ diagnostic¬ sequences¬ may¬ be¬ cleared¬ in¬ one¬ of¬ the¬ following¬ ways:

Vehicle¬ Moving

IMPORTANT: The¬ sequences¬ will¬ not¬ clear¬ if¬ the¬ rear¬ parking¬ assist¬ diagnostic¬ connector¬ is¬ grounded.

1. Drive¬ the¬ vehicle¬ forward¬ at¬ least¬ 24¬ km/h¬ (15¬ mph).
2. Stop¬ the¬ vehicle.
3. Turn¬ the¬ ignition¬ OFF.

Vehicle¬ Stopped

IMPORTANT: The¬ sequences¬ will¬ not¬ clear¬ if¬ the¬ rear¬ parking¬ assist¬ diagnostic¬ connector¬ is¬ grounded.

1. Turn¬ the¬ ignition¬ ON.
2. Place¬ your¬ foot¬ on¬ the¬ brake.
3. Shift¬ the¬ vehicle¬ into¬ REVERSE¬ within¬ 5¬ seconds.
4. Turn¬ the¬ ignition¬ OFF.
Good luck arrow points to grounding for dtc codes.
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Monday, February 18th, 2013 AT 5:47 PM

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