• | 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 |
---|---|---|---|---|
Amplifier Control | B1287 02 | B1287 04 | B1287 01 | -- |
The radio provides a remote amplifier mute output circuit to control overall muting of the remote amplifier. The amplifier receives pulse width modulated (PWM) signals on the control circuit at varying duty cycle percentages for controlling muted and unmuted functions of the amplifier. Circuitry internal to the radio monitors the remote amplifier mute circuit for faults and sets the appropriate DTC when faults are detected.
• | Radio is ON |
• | The system voltage is at between 9 volts and 16 volts |
A short to voltage, short to ground, or an open is seen on the remote enable circuit
Amplifier functions are disabled
• | A current DTC clears when the condition for setting the DTC is no longer present |
• | A history DTC clears after 100 malfunction-free ignition cycles |
Radio/Navigation System Schematics
Radio/Audio System Description and Operation
• | Circuit Testing |
• | Wiring Repairs |
Control Module References for scan tool information
Radio ON, adjust the fade and balance control to verify audio is present at each individual channel.
⇒ | If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio. |
⇒ | If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for radio or amplifier replacement