Circuit/System Testing

Digital Radio Antenna Circuit Malfunction

1. Ignition OFF, disconnect the digital radio antenna coax from the digital radio receiver (DRR). Connect the EL-48028  to the DRR and move the vehicle outside in an area with an unobstructed view of the southern sky, tune to XM.
2. Ignition ON, radio tuned to XM, verify XM reception is clear and uninterrupted.
   • If reception is not clear, replace the DRR.
3. Ignition OFF, reconnect the antenna coax to the DRR, disconnect the digital radio antenna coax from the digital radio antenna.
4. Ignition ON, test for 4.5-5.5V between the antenna coax center terminal and the coax outer shield.
   • If not within the specified range, replace the antenna coax.
5. If all circuits test normal, replace the digital radio antenna.

Digital Radio Output Circuit Malfunction

1. Ignition OFF, disconnect the X2 harness connector at the radio.
2. Ignition ON, radio ON and tuned to XM, test for a varying mV AC voltage reading between the following signal circuit terminals listed below and ground.
   • Left audio signal (+) - terminal 1
   • Right audio signal (+) - terminal 2
   • Audio common signal (-) - terminal 9
   • If the varrying mV A/C voltage reading is not present, test the signal circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the DRR.
3. If all circuits test normal, test or replace the radio.