Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Digital Radio Antenna Circuit Malfunction
- Ignition OFF, disconnect the antenna coax from the DRR. Connect the EL-48028 antenna to the DRR.
- Ignition ON, radio tuned to XM, verify XM reception is clear and uninterrupted.
- If reception is not clear, replace the DRR.
- Ignition OFF, reconnect the antenna coax to the DRR, disconnect the digital radio antenna coax from the digital radio antenna.
- Ignition ON, test for 4.5-5.5 volts between the antenna coax center terminal and the coax outer shield.
- If not within the specified range, replace the antenna coax.
- If all circuits test normal, replace the digital radio antenna.
Digital Radio Output Circuit Malfunction
- Ignition OFF, disconnect the X2 harness connector at the radio.
- Ignition ON, radio ON and tuned to XM, test for varying mV AC voltage between the following signal circuit terminals listed below and ground:
- Left audio signal (+) - connector X2, terminal 1
- Right audio signal (+) - connector X2, terminal 2
- Left audio signal (-) - connector X2, terminal 9
- Right audio signal (-) - connector X2, terminal 10
- If the varying mV A/C voltage 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.
- If all circuits test normal, replace the radio.