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Old 06-30-2010, 14:32   #1 (permalink)
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Check power assist on when in reverse. 03 Navigator

I have a 03 Lincoln Navigator and whenever I put it in reverse, the bottom right of the cluster, says check power assist. I tired looking in the owners manuel, but it says nothing about power assist. I tried looking online, and still nothing. I am thinking its short for something but i cannot figure out what it is. It only says check power assist when in reverse. Does anyone know what it means? Thanks a lot
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Old 06-30-2010, 17:34   #2 (permalink)
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Re: Check power assist on when in reverse. 03 Navigator

I'm sure you mean Check "Park" Assist. That means one of the sensors could be bad. Turn the key on, put it in reverse and put your hand by the sensors. You usually feell a ticking on good ones.
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Old 06-30-2010, 21:34   #3 (permalink)
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Re: Check power assist on when in reverse. 03 Navigator

Oh your right. It is park assist. No wonder no one but you could answer this thread. Thanks for correcting me.
So you are saying to turn the key to the on position but not start the car. And where would I find the senors? If it is not ticking, that means it is bad and I need to replace it?
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Old 06-30-2010, 21:52   #4 (permalink)
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Re: Check power assist on when in reverse. 03 Navigator

Key on engine off. They should be in the bumper. I can't remember the exact location.
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Old 06-30-2010, 22:05   #5 (permalink)
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Re: Check power assist on when in reverse. 03 Navigator

Oh I get it. Yes it is on the rear bumper you are right. Its called a parking assist and it beeps when you get close to an object. So if it ticks, it is working. Any idea how much the sensor cost and is it difficult to replace?
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Old 06-30-2010, 23:05   #6 (permalink)
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Re: Check power assist on when in reverse. 03 Navigator

Hi msrdude

There are 2 parking assist sensors(ultrasonic). One left and one right. You must remove the rear bumper cover to get to them. There could also be a fault with the other sensor in your bumper that works with the park assist feature. This is called the radar sensor. The new park assist system uses the the two ultrasonic parking assist sensors and the hidden radar sensor to improve accuracy and range over existing ultrasonic-only systems. The radar is effective for sweeping the area immediately behind the vehicle and the ultrasonic sensors provide an effective range of up to 20 feet (6.1 meters).

Here are some diagrams for you to review that may very well come in handy for you:

PARKING AID SENSOR

REMOVAL


All sensors
  1. Remove the rear bumper cover.
Ultrasonic sensor


  1. Remove the parking aid sensor.
    • Disconnect the electrical connector.
    • Release the locking tabs
Radar sensor


  1. Remove the foam absorber from the bumper cover.
  1. Remove the radar sensor.
    • Remove the fasteners.
    • Disconnect the electrical connector.
INSTALLATION


All sensors
  1. To install, reverse the removal procedure.
  2. PERFORM Park Aid Calibration and Self-Test Diagnostics.
Any one of these sensors can be had for less than $100 online. The key is finding out which one is bad. Hopefully it's as easy as checking for the "clicking" as rtg says. Installing a new parking aid sensor shouldn't be too difficult. It looks pretty straightforward as you can see in the diagrams. After reviewing the diagnostic test procedures, I noticed that an ohmmeter is required for the troubleshooting process. Hopefully rtg is on track here though and you don't have to go through the testing procedure. Checking for a clicking noise sure seems a whole lot easier than probing a bunch of connections to get resistance readings. But if it comes to that, we can help you tackle that procedure if need be.

Good Luck!
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Old 07-01-2010, 11:41   #7 (permalink)
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Re: Check power assist on when in reverse. 03 Navigator

Hi KStromberg

I was wondering can we hook up 12 volts to the radar and the sensors to see if it is working properly?
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Old 07-06-2010, 22:58   #8 (permalink)
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Re: Check park assist on when in reverse. 03 Navigator

Ok, I have seen that it says "check park assist" when I put it in reverse, but the sensors still beep when I am close to an object. Does that mean one sensor is working while the other sensor is broken??? I think applying 12 volt to the sensor will work.
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Old 08-05-2010, 18:21   #9 (permalink)
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Re: Check power assist on when in reverse. 03 Navigator

Forget my last post, I was wrong. What i mean is: at times, the park assist will work; meaning it will beep, but at times, it will say check park assist and will not beep. What does that mean??? Sensor going bad, or is it something else like the radar sensor or something.
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Old 08-05-2010, 18:46   #10 (permalink)
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Re: Check power assist on when in reverse. 03 Navigator

Could be a poor connection to one of the sensors or a sensor is going bad. You'll have to check it when it's causing the message.
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