• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
B+ Voltage | -- | 1 | -- | -- |
Left Audio Signal (+) | 2 | 2 | 2 | -- |
Left Audio Signal (-) | 2 | 2 | 2 | -- |
Right Audio Signal (+) | 3 | 3 | 3 | -- |
Right Audio Signal (-) | 3 | 3 | 3 | -- |
Digital Radio Antenna Coax | B1259 02 | B1259 05 | B1259 05 | -- |
Ground | -- | 1 | -- | -- |
1. No communication with DRR/XM not available 2. No or distorted audio from left side speakers when listening to digital radio 3. No or distorted audio from right side speakers when listening to digital radio |
The digital radio receiver (DRR) receives an XM satellite radio signal via the digital radio antenna. This signal is passed to the DRR through the digital radio antenna coax. The DRR sends a varying AC mV signal through separate left and right audio circuits (+ and -) to the radio. The voltage amount and rate of change is dependent upon the type of signal being received. The radio then processes these signals and passes the audio to the appropriate speakers or amplifier.
When diagnosing digital radio concerns, the vehicle should be located outside with an unobstructed view of the southern sky to ensure proper reception of the satellite signal. Reception may limited, intermittent or not possible inside structures or under heavy cover.
Radio/Navigation System Schematics
Entertainment/Communication Connector End Views
Radio/Audio System Description and Operation
EL-48028 Digital Radio Test Antenna
⇒ | If any speaker is not producing sound or the sound produced is distorted, refer to Speakers Inoperative - One or More. |
⇒ | If the No XM Signal message is displayed or XM reception is poor, refer to Digital Radio Antenna Circuit Malfunction. |
⇒ | If either side of the vehicle is not producing sound or the sound produced is distorted, refer to Digital Radio Output Circuit Malfunction. |
⇒ | If reception is not clear, replace the DRR. |
⇒ | If not within the specified range, replace the antenna coax. |
• | Left audio signal (+) - terminal 1 |
• | Right audio signal (+) - terminal 2 |
• | Left audio signal (-) - terminal 9 |
• | Right audio signal (-) - terminal 10 |
⇒ | If the voltage is not as specified, 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. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for DRR or Radio replacement, setup and programming |