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A guide to damage analysis and repairs to satellite radio systems |
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Thursday, 05 April 2007 |
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Page 2 of 2 System testing example
An example of a procedure for testing a satellite radio is for the 2007 Cadillac STS satellite radio system. A GM Digital Radio Test Antenna (part number EL-48028) is required for the procedure.
With the ignition off, the antenna coaxial cable is disconnected from the radio receiver. The test antenna is connected to the receiver. Next, the ignition is turned on, the radio is turned on, and the satellite radio system tuned. If there is no reception, the receiver must be replaced.
To test the coaxial antenna cable, with the ignition off, the receiver antenna is disconnected from the coaxial cable. The resistance of the antenna coaxial cable center conductor is then tested from end to end. If the resistance is greater than 5 ohms, the antenna coaxial cable must be replaced.
The resistance of the antenna coaxial cable outer shield is also tested from end to end. Again, if the resistance is greater than 5 ohms, the antenna coaxial cable is replaced.
Finally, the resistance of the antenna coaxial cable is tested between the center conductor and the outer conductor. There should be infinite resistance between both conductors. If there is less than infinite resistance between the inner conductor and the outer conductor of the coaxial cable, the antenna coaxial cable is replaced. If the coaxial cable tests normal, the digital radio antenna must be replaced.
Conclusion
Advanced entertainment systems such as satellite radio may present new challenges when doing collision damage analysis and repairs. Knowing how a satellite system operates can help determine the source of the problem and what steps need to be taken to return the system to satisfactory operation.
This Advantage Online article first appeared in the I-CAR e-newsletter, which is published and distributed free of charge. I-CAR, the Inter-Industry Conference on Auto Collision Repair, is a not-for-profit international training organization that researches and develops quality technical education programs related to collision repair. To learn more about I-CAR, and to subscribe to the free e-newsletter, visit http://www.i-car.com or contact I-CAR Marketing Communications Specialist Brandon Eckenrode at Brandon.
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