2007 Jeep Compass

Reconnect/Relearn Procedure

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Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

Vehicles equipped with engine and transmission computers may require a relearn procedure after the vehicle battery has been disconnected. Most vehicle computers memorize and store vehicle operational patterns. When the battery is disconnected, the information may be cleared. If the information is cleared, the computer will go into default mode in order to operate the vehicle. The vehicle computer will relearn operational patterns each time the vehicle is restarted. The relearning process may take up to 40 or more key cycles.

When a specific engine component is replaced, a relearn procedure may be required. If the relearn procedure is not performed, the vehicle may exhibit the following:



Harsh or poor shift quality
 
Poor fuel mileage
 
Hesitation or stumble
 
Unstable idle or stalling
 
Lean or rich running conditions
 

If an accessory component was replaced, a relearn procedure may also be required. The following systems and components may not work properly without a relearn procedure:



Anti-theft system
 
Steering system
 
Power window system
 
Power sunroof system
 

It is important to reset any Diagnostic Trouble Codes (DTC-s) before performing the relearn procedure. Most relearn procedures can be performed with the use of an OBD-2 scan tool.


NOTE
This reconnection procedure is to be performed anytime the battery has been disconnected.

  1. Connect the battery negative cable to the battery post and tighten the clamp nut to 45 inch lbs. (5 Nm).
  2.  
  3. If the vehicle is equipped with Electronic Stability Program (ESP), once the battery is reconnected, the Steering Angle Sensor (SAS) in the clockspring needs to be calibrated.
    NOTE
    The SAS requires calibration anytime the battery or an ABS (ESP) component has been disconnected for any length of time. If the SAS is not calibrated following battery reconnection, the ESP/SAS indicator lamp is illuminated following 5 ignition cycles indicating the need for calibration.

  4.  
  5. To calibrate, perform the following:
  6.  
  7. Start the engine.
  8.  
  9. Center the steering wheel.
  10.  
  11. Turn the steering wheel all the way to the left until the internal stop in the steering gear is met.
  12.  
  13. Turn the wheel all the way to the right until the opposite internal stop in the steering gear is met.
  14.  
  15. Center the steering wheel.
  16.  
  17. Turn off the engine.
  18.  

 
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