2007 Jeep Compass

Tire Pressure Monitor System

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Description & Operation



Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

The Tire Pressure Monitoring (TPM) system monitors air pressure in the 4 road tires. Pressure in the spare tire is not monitored.

There are 2 tire pressure monitoring systems available, a base system and a premium system. The base system does not specify how many tires are low or where they are located, whereas the premium system does.

The Base TPM system consists of tire pressure monitoring sensors attached to each road wheel through the valve stem mounting hole, a central receiver module-Wireless Ignition Node (WIN), and an indicator lamp.

The Premium TPM system consists of tire pressure monitoring sensors attached to each road wheel through the valve stem mounting hole, a WIN, 3 wheel sensor transponders located in 3 of the 4 wheel wells, an electronic display, and an indicator lamp.

The receiver circuit for the TPM system is integrated into the WIN. For non-remote start vehicles, the antenna is internal to the WIN. For factory installed remote start vehicles, the antenna is external to the WIN. The WIN can also include the Remote Keyless Entry (RKE) receiver, Remote Start (if equipped), and the Sentry Key Immobilizer (SKIM) receiver. All receivers share a number of common components. The WIN decodes the RF signals transmitted by each of the vehicle tire pressure sensors. The decoded information is used to determine if WARNING or FAULT conditions exist within the TPM system.

Upon detection of a WARNING or FAULT condition, the WIN will send a request to the module that controls the indicator lamp (and the text display, if equipped with the Premium system) via the vehicle bus system to illuminate or flash the indicator lamp. Also, upon detection of a warning or fault condition, the electronic display will send a request to sound the chime.

The WIN will store all warning and fault conditions, placard pressure values and low-pressure threshold values (lamp ON and OFF) in the memory that can be accessed through diagnostic communication. If new sensors are introduced to the vehicle, the data stored for the sensor being replaced will be deleted.

The WIN will store all wheel sensor ID-s and locations and faults in memory that can be accessed through diagnostic communication. All other data values transmitted from each active wheel sensor (not the spare tire) shall be stored in the WIN memory.

The WIN automatically learns and stores the sensor ID-s while driving within 20 minutes continuously above 15 mph (24 km/h) after a sensor has been replaced. The learning sequence will initiate when the vehicle has been stopped for more than 20 minutes.


NOTE
A new sensor ID can also be programmed directly into the WIN or TPM module by using a RKETPM Analyzer in conjunction with a Scan Tool. Once the new sensor ID has been programmed, the vehicle will need to be driven above 15 mph (24 km/h) until the fault is no longer active (lamp extinguishes) and the display is updated (for up to 20 minutes).

Display



Removal & Installation

The Tire Pressure Monitor (TPM) system fault indicator is displayed in the instrument panel cluster. Refer to Instrument Panel, removal & installation.

Precautions



Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

The Tire Pressure Monitor (TPM) system has been optimized for the original equipment tires and wheels. The TPM pressures have been established for the tire size equipped on your vehicle. Undesirable system operation or sensor damage may result when using replacement equipment that is not of the same size, type, and/or style. After-market wheels can cause sensor damage. Do not use aftermarket tire sealants or balance beads if your vehicle is equipped with a TPM system, as damage to the sensors may result.

After inspecting or adjusting the tire pressure always reinstall the valve stem cap. This will prevent moisture and dirt from entering the valve stem, which could damage the TPM Sensor.

Tire pressure sensor valve stem caps and cores are specially designed for the sensors. Due to the risk of corrosion, do not use a standard valve stem cap or core in a tire pressure sensor in place of the original equipment style sensor cap and core.

Any time a sensor is to be reinstalled in a wheel, a new seal, cap, and valve core must be installed on the stem to ensure an air tight sealing. TPM system thresholds have been established for the original tire size equipped on the vehicle. Use original size tires only to maintain system accuracy.

Receiver/Transponder



Removal & Installation

A transponder, sometimes referred to as a trigger module, is located in 3 of the 4 wheel wells (behind the wheelhouse splash shields) of a vehicle equipped with the Premium TPM. These transponders are used to provide the Wireless Ignition Node (WIN) with the location of the tire pressure sensors on the vehicle. A 4th transponder is not necessary in the remaining wheel well due to the process-of-elimination theory. Once the system knows the location of the first 3 sensors, it assumes the location of the 4th tire pressure sensor. On this vehicle, there is a transponder located in the left front, left rear, and right front wheelhouse. There is not a transponder located in the right rear wheelhouse.

Front Transponder

Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Remove the front wheelhouse splash shield fasteners (1).

    Click image to see an enlarged view

    Fig. Remove the front wheelhouse splash shield fasteners

  6.  
  7. Remove the remaining fasteners (1) and remove the splash shield (2).

    Click image to see an enlarged view

    Fig. Remove the remaining fasteners (1) and remove the splash shield (2)

  8.  
  9. Disconnect the wiring harness connector (2) at the transponder (1).
  10.  
  11. Remove the mounting nuts (3), then remove the transponder (1).

    Click image to see an enlarged view

    Fig. Disconnect the wiring harness connector (2) at the transponder (1). Remove the mounting nuts (3), then remove the transponder (1)

  12.  

To install:

  1. Position the transponder (1) and install the mounting nuts (3).
  2.  
  3. Connect the wiring harness connector (2) to the transponder (1).
  4.  
  5. Install the wheelhouse splash shield and all components removed to access it.
  6.  
  7. Verify proper operation of the TPM system.
  8.  

Rear Transponder

Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Remove the wheelhouse splash shield at the transponder requiring service.
    1. Remove the fasteners along the outer edge of the splash shield.
    2.  
    3. Remove the front, rear, and inner push-pin fasteners.
    4.  
    5. Remove the splash shields.
    6.  

  6.  
  7. Disconnect the wiring harness connector (3) at the transponder (1).
  8.  
  9. Remove the mounting nuts (2), then remove the transponder (1).

    Click image to see an enlarged view

    Fig. Disconnect the wiring harness connector (3) at the transponder (1). Remove the mounting nuts (2) and the transponder (1)

  10.  

To install:

  1. Position the transponder (1) and install the mounting nuts (2).
  2.  
  3. Connect the wiring harness connector (3) to the transponder (1).
  4.  
  5. Install the rear wheelhouse splash shield and all components removed to access it.
  6.  
  7. Verify proper operation of the TPM system.
  8.  

Servicing



Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

For service repair procedures, refer to Chassis Electrical, Tire Pressure Monitor.

Transmitter/Sensor



Removal & Installation
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Remove the tire and wheel assembly.
    NOTE
    The cap used on this valve stem contains an O-ring seal to prevent contamination and moisture from entering the valve stem. Retain this valve stem cap for reuse. Do not substitute a regular valve stem cap in its place.


    WARNING
    The valve stem used on this vehicle is made of aluminum and the core is nickel plated brass. The original valve stem core must be reinstalled and not substituted with a valve stem core made of a different material. This is required to prevent corrosion in the valve stem caused by the different metals.

  6.  
  7. Dismount the tire from the wheel following the tire changer manufacturer-s instructions while paying special attention to the following to avoid damaging the pressure sensor:
    1. When breaking the tire bead loose from the wheel rim, avoid using the Bead Breaker in the area of the sensor (1). That includes both outer and inner beads of the tire.
    2.  
    3. When preparing to dismount the tire from the wheel, carefully insert the mounting/dismounting tool 280° from the valve stem (plus or minus 10°), then proceed to dismount the tire from the wheel. Use this process on both outer and inner tire beads.

      Click image to see an enlarged view

      Fig. Avoid using the Bead Breaker in the area of the sensor (1). To remove the tire from the wheel, insert the mounting/dismounting tool 280° from the valve stem (plus or minus 10°)

    4.  

  8.  
  9. Remove the sensor nut (3) retaining the sensor to the wheel. While removing the nut, hold pressure against the rear of the metal valve stem to keep the valve stem from pushing rearward, damaging the antenna strap.
  10.  
  11. Remove the Tire Pressure Monitor (TPM) sensor (1) from the wheel (2).

    Click image to see an enlarged view

    Fig. Remove the Tire Pressure Monitor (TPM) sensor (1) from the wheel (2)

  12.  

To install:


NOTE
Before reinstalling an existing tire pressure sensor, replace the seal (2) and the metal washer (1) at the base of the sensor valve stem (6) to ensure proper sealing.

  1. Wipe the area clean around the sensor/valve stem mounting hole in the wheel (5). Make sure the surface of the wheel is not damaged.
    WARNING
    To avoid damaging the sensor antenna strap, if equipped, hold pressure against the rear of the metal valve stem while the sensor is inserted through the wheel mounting hole and the nut is installed.



    Click image to see an enlarged view

    Fig. Exploded view of the TPM sensor

  2.  
  3. Insert the sensor (1) through the wheel (2), as shown, keeping pressure against the rear of the metal valve stem (See Arrow). The potted side of the sensor is to be positioned toward the wheel. Do not attempt to mount the sensor otherwise, damage may occur.

    Click image to see an enlarged view

    Fig. Insert the sensor through the wheel, as shown, keeping pressure against the rear of the metal valve stem (See Arrow)

  4.  
  5. Install the sensor nut (with the pressed-in washer) (3) by hand.
    NOTE
    Before tightening the sensor nut, push downward on the sensor housing (2) in an attempt to make it flush with the interior contour of the wheel (1).

  6.  
  7. While holding the sensor in position, tighten the sensor nut to 71 inch lbs. (8 Nm).
    WARNING
    Over-tightening the sensor nut by as little as 106 inch lbs. (12 Nm) may result in sensor separation from the valve stem. Under this condition, the sensor may still function. However, the condition should be corrected immediately.

  8.  
  9. Mount the tire on the wheel following the tire changer manufacturer-s instructions, paying special attention to the following to avoid damaging the tire pressure sensor:
    1. Rotating Wheel Tire Changers -Once the wheel is mounted to the changer, position the sensor valve stem (2) approximately 280° from the head of the changer (located at 1) in a clockwise direction before rotating the wheel (also in a clockwise direction) to mount the tire. Use this procedure on both the outer and inner tire beads.

      Click image to see an enlarged view

      Fig. Position the sensor valve stem (2) approximately 280° from the head of the changer (located at 1) before rotating the wheel-rotating wheel tire changers

    2.  
    3. Rotating Tool Tire Changers -Position the wheel on the changer so that the sensor valve stem (1) is located approximately 210° clockwise from the installation end of the mounting/dismounting tool (2) once the tool is mounted for tire installation. Make sure the sensor is clear of the lower bead breaker area (3) to avoid damaging the sensor when the breaker rises. Rotate the tool (2) in a counterclockwise direction to mount the tire. Use this procedure on both the outer and inner tire beads.

      Click image to see an enlarged view

      Fig. Position the wheel on the changer so that the sensor valve stem (1) is located approximately 210° clockwise from the installation end of the mounting/dismounting tool (2). Make sure the sensor is clear of the lower bead breaker area (3)-rotating tool tire changers

    4.  

  10.  
  11. Adjust the air pressure to that listed on the Tire Inflation Pressure Label (Placard) provided with the vehicle (usually applied to the driver side B-pillar). Make sure the original style valve stem cap is securely installed to keep moisture out of the sensor.
  12.  
  13. Install the tire and wheel assembly on the vehicle. Torque the lug nuts, in a star pattern sequence, to 1 / 2 the torque specifications. Then repeat the tightening sequence to the full torque specification of 100 ft. lbs. (135 Nm).
  14.  
  15. Lower the vehicle.
  16.  
  17. Perform one of the following to make the system learn the new sensor ID.
    1. Use the TPM-RKE Analyzer, 9936, with the Scan Tool to program the Wireless Ignition Node (WIN) with the tire pressure sensor ID.
    2.  
    3. Once the vehicle has remained stationary for more than 20 minutes, drive the vehicle for a minimum of 10 minutes while maintaining a continuous speed above 15 mph (24 km/h). During this time, the system will learn the new sensor ID.
    4.  

  18.  
  19. If a sensor cannot be trained, refer to the appropriate diagnostic information.
  20.  

 
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