B1287 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1287 – Amplifier Control Signal Circuit

 

B1287 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B1287 Possible Causes

 

Faulty Amplifier,Amplifier harness is open or shorted,Amplifier circuit poor electrical connection,Faulty Radio Unit

 

B1287 Description

 

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 Diagnostic Trouble Code (DTC) when faults are detected.