• | 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 | 4 | 4 | -- |
Ground | -- | 1 | -- | -- |
1. No communication with Digital Audio Broadcast module. 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. Poor or no reception with Digital Audio Broadcast. |
The Digital Audio Broadcast (DAB) radio receiver receives a digital radio signal via the digital radio antenna. This signal is passed to the DAB module through the digital radio antenna coax. The DAB module 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 amplifier.
The ignition is ON.
The Digital Audio Broadcast module detects a short to ground in the antenna circuit.
The radio no longer emits audio when on digital audio broadcast radio.
• | A current DTC will clear when the conditions for setting the DTC are no longer present. |
• | A history DTC clears after 100 malfunction-free ignition cycles. |
When diagnosing digital radio concerns, the vehicle should be located outside with an unobstructed view of the sky to ensure proper reception of the digital radio signal. Reception may limited, intermittent or not possible inside structures or under heavy cover.
Radio/Navigation System Schematics
Radio/Audio System Description and Operation
Control Module References for scan tool information
EL-48028 Digital Radio Test Antenna
⇒ | If any speaker is not producing sound or the sound produced is distorted, refer to Speaker Malfunction. |
⇒ | If the DTC is current, replace the A12 digital radio receiver. |
⇒ | If not within the specified range, replace the antenna coax. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for Radio and Digital Audio Broadcast replacement, setup, and programming