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B1287 Amplifier Control Signal Circuit

OBD2 Code: B1287

Description: Amplifier Control Signal Circuit Malfunction

Definition: The OBD-II code B1287 indicates a malfunction in the amplifier control signal circuit, which may affect the audio system’s performance or communication with other vehicle systems.

b1287: Amplifier Control Signal Circuit – Severity: Moderate

Common Causes

b1287 – Amplifier Control Signal Circuit

Common causes:

• Faulty amplifier control module
• Wiring issues in the amplifier control signal circuit
• Poor electrical connection in the circuit
• Corrosion or damage to connectors related to the amplifier control signal circuit

Common Misdiagnosis

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OBD2 Code: B1287

Description: Amplifier Control Signal Circuit

Common Misdiagnosis: Faulty amplifier assumed when the issue is often due to wiring problems or poor connections.

Common Diagnostic Steps

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OBD2 Code: B1287 – Amplifier Control Signal Circuit

Description: This code indicates a problem with the amplifier control signal circuit, which is responsible for controlling the audio amplifier in the vehicle.

Common Diagnostic Steps:

• Inspect all related wiring and connectors for damage or corrosion. Repair or replace as necessary.
• Check the fuse associated with the amplifier circuit to ensure it is not blown.
• Test the amplifier control signal wire for continuity using a multimeter.
• Verify that there is proper voltage supply to the amplifier from the battery and alternator.
• Examine the ground connections of the amplifier circuit for any loose or corroded contacts.
• If equipped, use a scan tool to check for any additional codes that might indicate other issues within the audio system.
• Consult the vehicle’s service manual for specific diagnostic procedures related to this code and follow them accordingly.
• If all checks are normal, consider testing or replacing the audio amplifier itself if it appears faulty.