DTC Descriptor
DTC 1287: External Amp ControlDiagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Amp Control | DTC B1287 | DTC B1287 | DTC B1287¹ | -- |
¹ No audio output. | ||||
Circuit/System Description
The amplifier receives PWM signals on the circuit at varying duty cycle percentages for controlling the muted and unmuted functions of the amplifier.
Conditions for Running the DTC
The following are conditions that must be present in order for the radio to enable the diagnostics.
| • | The radio is in ACCESSORY, RUN, or RAP power mode. |
| • | The system voltage is at least 9 volts and no more than 16 volts. |
Conditions for Setting the DTC
Circuit failure 400 ms after radio activates Remote Enable.
Action Taken When the DTC Sets
The radio sets the DTC and continues normal operation.
Conditions for Clearing the DTC
| • | The condition must be corrected. |
| • | A history DTC clears after 100 malfunction-free ignition cycles. |
Reference Information
Schematic Reference
Connector End View Reference
Entertainment Connector End Views
Electrical Information Reference
Circuit/System Verification
Verify the audio system performance by adjusting the fade and balance of the speaker outputs.
Circuit/System Testing
Ignition OFF, test the remote radio control signal circuit for an open, a short to voltage, or a short to ground. If the circuit tests normal, replace the radio.
| ⇒ | If the circuit tests normal, replace the radio. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
