• | 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 provide an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
B+ Voltage | -- | 1 | -- | -- |
Ground | -- | 1 | -- | -- |
Left Audio Signal (+) | 2 | 2 | 2 | -- |
Right Audio Signal (+) | 3 | 3 | 3 | -- |
Audio Common Signal (-) | 4 | 4 | 4 | -- |
Digital Radio Antenna Coax | B1259 | B1259 | B1259 | -- |
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 4. No or distorted audio from all 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.
• | The radio is ON. |
• | Battery voltage must be between 9-16 volts. |
The DTC will set when the DRR detects a short to voltage, short to ground, or an open/high resistance in the antenna ground circuit.
• | Digital radio reception may be poor or not available. |
• | The radio displays "No XM Signal" or "Check Antenna". |
• | The condition responsible for setting the DTC no longer exists. |
• | A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred. |
Radio/Navigation System Schematics
Entertainment/Communication Connector End Views
Radio/Audio System Description and Operation
EL-48028 Digital Radio Test Antenna
⇒ | If the DTC is current, replace the DRR. |
⇒ | If not within the specified range, replace the antenna coax. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for DRR replacement, setup, and programming |