Grand Cherokee 2WD V8-4.7L Flex Fuel (2008)
Garage Door Opener Transmitter: Component Tests and General Diagnostics
UNIVERSAL TRANSMITTER
If the Universal Transmitter is inoperative, but the Electronic Vehicle Information Center (EVIC) is operating normally, See: Programming and
Relearning for instructions on training the Transmitter. Retrain the Transmitter with a known good transmitter as instructed and test the Transmitter
operation again.
If the unit is still inoperative, test the universal transmitter with Radio Frequency Detector special tool. as described below:
1. Turn the Radio Frequency (RF) Detector ON. A "chirp" will sound and the green power LED will light. If the green LED does not light, replace
the battery.
2. Hold the RF detector within one inch of the TRAINED universal transmitter and press any of the transmitters buttons.
3. The red signal detection LEDs will light and the tool will beep if a radio signal is detected. Repeat this test for each button. If any button is
inoperative, replace the universal transmitter assembly, See: Service and Repair/Removal.
If both the Transmitter and the Electronic Overhead Module (EOM) are inoperative, See: Driver/Vehicle Information Display/Testing and Inspection for
further diagnosis. Refer to the appropriate wiring information for complete circuit schematic or connector pin-out information.
