Jeep Liberty KJ. Manual - part 144

STANDARD PROCEDURE

STANDARD PROCEDURE - ERASING TRANSMITTER CODES

To erase all universal transmitter codes, simply hold down buttons 1 and 3 until the two green dots below the house
symbol begin to flash and “CHANNELS CLEARED” is displayed.

NOTE: Individual channels cannot be erased. Erasing the transmitter codes will erase ALL programmed
codes.

STANDARD PROCEDURE - PROGRAMMING TRANSMITTER CODES

WARNING: Before programming the universal transmitter to a garage door opener or gate operator, make sure
that people and objects are out of the way of the device to prevent potential harm or damage. When programming
a garage door opener, it is advised to park outside of the garage. Do not use universal transmitter with any
garage door opener that lacks safety stop and reverse features as required by U.S. federal safety standards (this
includes any garage door opener model manufactured before April 1, 1982). A garage door that cannot detect an
object - signaling the door to stop and reverse - does not meet current U.S. federal safety standards.

WARNING: Your motorized door or gate will open and close while you are programming. Do not program
the universal transmitter if people or pets are in the path of the door or gate. A moving door or gate can
cause serious injury or death to people and pets or damage to objects.

NOTE: It is recommended that a new battery be placed in the hand-held transmitter of the device being
programmed to the universal transmitter for quicker training and accurate transmission of the radio fre-
quency signal.

1. Turn off the engine.

2. Erase the factory test codes by pressing buttons 1 and 3. Release the buttons when the two green lights begin

to flash (about 20 seconds).

3. Choose one of the three buttons to train. Position the end of your hand-held transmitter 1-3 inches (5-14 cm)

away from the lower left corner of the EVIC display while keeping the display in view.

4. Simultaneously press and hold both the desired Transmitter button and the hand-held transmitter button. After a

short time, the message TRAINING will show on Transmitter display. Do not release the buttons until the mes-
sage TRAINED appears on the display (this may take as long as 60 seconds), release both the Transmit-
ter and hand-held transmitter buttons.

5. Press and hold the just-trained Transmitter button. TRANSMIT should appear on the display. If your device acti-

vates when the Transmitter button is depressed and released, programming is complete. To train the other but-
tons, repeat the process. Be sure to keep your hand-held transmitter in case you need to retrain the universal
transmitter.

NOTE: If the message TRANSMIT appears on the Transmitter display but your device does not activate, the
device may be equipped with a

(

rolling code

(

system. Continue with steps six through eight below to com-

plete the programming of a rolling code equipped device (most commonly a garage door opener).

6. At the garage door opener receiver (motor-head unit) in the garage, locate the

learn

smart

button. This can

usually be found where the hanging antenna wire is attached to the motor-head unit. Firmly press and release
the

learn

smart

button. (The name and color of the button may vary by manufacturer.)

NOTE: There are 30 seconds in which to initiate the next step.

7. Return to the vehicle and firmly press, hold for two seconds and release the programmed Transmitter button. Repeat

the

press/hold/release

sequence a second time, and, depending on the brand of the garage door opener (or other

rolling code equipped device), repeat this sequence a third time to complete the programming process.

8. Transmitter should now activate your rolling code equipped device. To program the remaining two buttons, simply

repeat the process.

8M - 38

OVERHEAD CONSOLE-SERVICE INFO

AMBIENT TEMP SENSOR

DESCRIPTION

Ambient air temperature is monitored by the Electronic
Overhead Module (EOM) through ambient tempera-
ture sensor messages received from the Powertrain
Control Module (PCM) over the Programmable Com-
munications Interface (PCI) data bus network. The
PCM receives a hard wired input from the ambient
temperature sensor. The ambient temperature sensor
is a variable resistor mounted in front the radiator,
behind the grille, near the center of the vehicle.

Refer to Powertrain Control Module (PCM) in Elec-
tronic Control Modules for more information. For com-
plete circuit diagrams, refer to the Wiring information.
The ambient temperature sensor cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

OPERATION

The ambient temperature sensor is a variable resistor that operates on a five-volt reference sent to it by the Pow-
ertrain Control Module (PCM). The resistance in the sensor changes as temperature changes. This changes the
temperature sensor return signal circuit voltage to the PCM. Based upon the resistance in the sensor, the PCM is
programmed to correspond to a specific temperature. The PCM then sends the proper ambient temperature mes-
sages to the EVIC over the PCI data bus.

The thermometer function is supported by the ambient temperature sensor, a wiring circuit, the Powertrain Control
Module (PCM), the Programmable Communications Interface (PCI) data bus, and a portion of the Electronic Vehicle
Information Center (EVIC) Computer module.

The ambient temperature sensor circuit can also be diagnosed by referring to Diagnosis and Testing - Ambient
Temperature Sensor, and Diagnosis and Testing - Ambient Temperature Sensor Circuit. If the temperature
sensor and circuit are confirmed to be OK, but the temperature display is inoperative or incorrect, refer to Diagno-
sis and Testing - Electronic Vehicle Information Center Computer in this section. For complete circuit diagrams,
refer to the Wiring information.

DIAGNOSIS AND TESTING

DIAGNOSIS AND TESTING - AMBIENT TEMPERATURE SENSOR

1. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Disconnect the

ambient temperature sensor wire harness connector.

2. Measure the resistance of the ambient temperature sensor. At room temperature (approx. 68°F), the sensor

resistance should be between 10-13 Kilohms (10000-13000 ohms). The sensor resistance should be between
these two values at 68°F. If OK, the sensor is OK at this time. If not OK, replace the faulty ambient temperature
sensor.

DIAGNOSIS AND TESTING - AMBIENT TEMPERATURE SENSOR CIRCUIT

1. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Disconnect the

ambient temperature sensor wire harness connector and the Powertrain Control Module (PCM) wire harness
connector.

2. Connect a jumper wire between the two terminals in the body half of the ambient temperature sensor wire har-

ness connector.

3. Check for continuity between the sensor return circuit and the ambient temperature sensor signal circuit cavities

of the PCM wire harness connector. There should be continuity. If OK, go to Step 4. If not OK, repair the open
sensor return circuit or ambient temperature sensor signal circuit to the ambient temperature sensor as required.

4. Remove the jumper wire from the body half of the ambient temperature sensor wire harness connector. Check

for continuity between the sensor return circuit cavity of the PCM wire harness connector and a good ground.
There should be no continuity. If OK, go to Step 5. If not OK, repair the shorted sensor return circuit as required.

OVERHEAD CONSOLE-SERVICE INFO

8M - 39

5. Check for continuity between the ambient temperature sensor signal circuit cavity of the PCM wire harness con-

nector and a good ground. There should be no continuity. If OK, refer to Diagnosis and Testing - Electronic
Vehicle Information Center Computer in this group. If not OK, repair the shorted ambient temperature sensor
signal circuit as required.

REMOVAL

1. Open hood, disconnect and isolate the negative battery cable.

2. Remove the grille from the vehicle.

3. Disconnect the ambient temperature sensor electrical connector.

4. Remove the ambient temperature sensor retaining screw and remove the sensor from the vehicle.

INSTALLATION

1. Position the ambient temperature sensor and install the retaining screw.

2. Connect the ambient temperature sensor electrical connector.

3. Install the grille on the vehicle.

4. Connect the negative battery cable.

8M - 40

OVERHEAD CONSOLE-SERVICE INFO