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B1085 GMC Code - Left Front Instrument Panel Audio Output 7 Circuit

- Code Popularity: 1,263 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC B1085 GMC?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Audio Amplifier
  • Faulty Left Front Instrument Panel Speaker
  • Left Front Instrument Panel Speaker harness is open or shorted
  • Left Front Instrument Panel Speaker circuit poor electrical connection
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How to Fix the DTC B1085 GMC?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

B1085:01 Left Front Instrument Panel Audio Output 7 Circuit Short to Battery
B1085:02 Left Front Instrument Panel Audio Output 7 Circuit Short to Ground
B1085:04 Left Front Instrument Panel Audio Output 7 Circuit Open

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1085 GMC code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code B1085 GMC Description

The Media Oriented Systems Transport (MOST) is a high-speed multimedia network technology. The serial MOST bus uses a ring topology and synchronous data communication to transmit audio, video, data and control information between any devices attached.
The audio amplifier is a participant on the MOST network. The audio amplifier receives audio input and control information from the MOST bus.
Each of the audio output channel circuits (+) and (−), at the audio amplifier have a DC bias voltage that is approximately one-half of the battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound.

OBDII Code B1085 GMC - Left Front Instrument Panel Audio Output 7 Circuit - AutoCodes.com
B1085 GMC Code - Left Front Instrument Panel Audio Output 7 Circuit

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