Diagnosis And Testing - Universal Transmitter

If the Universal Transmitter is inoperative, but the tire pressure monitoring system and compass are operating normally, refer to STANDARD PROCEDURE - SETTING TRANSMITTER CODES  . Retrain the Transmitter with a known good transmitter and test the Transmitter operation again. If the Universal Transmitter, Tire Pressure monitoring and compass are inoperative, refer to OVERHEAD CONSOLE  - Diagnosis and Testing for diagnosis. For complete circuit diagrams, refer to SYSTEM WIRING DIAGRAMS . If the universal transmitter is inoperative, test the transmitter with special tool Radio Frequency Detector. See Fig 1. Procedure is as follows:

1. Turn the Radio Frequency 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 three times.

Fig 1: Radio Frequency Detector

Courtesy of DAIMLERCHRYSLER CORP.