Engine-Codes - Generic - B0685

B0685 - Security System Indicator Circuit Short to Ground

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

B0685 Possible Causes

  • Faulty Light/Sunload Ambient Sensor
  • Light/Sunload Ambient Sensor harness is open or shorted
  • Light/Sunload Ambient Sensor circuit poor electrical connection
  • Faulty Body Control Module (BCM)

How do I fix code B0685?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Cost of diagnosing the B0685 code

Labor: 1.0

The cost of diagnosing the B0685 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

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

B0685 Meaning

The security LED is controlled by the Body Control Module (BCM) based on commands from the content theft deterrent system. The security LED is located in the dash as part of the ambient light sensor and is supplied ground at all times. When the content theft deterrent system requests the LED be commanded ON, the BCM applies voltage to the security indicator control circuit, illuminating the LED.

B0685 More Information

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Information for specific makes

  • B0685 BUICK Security System Indicator Circuit Short to Ground
  • B0685 CADILLAC Security System Indicator Circuit Short to Ground
  • B0685 CHEVROLET Security System Indicator Circuit Short to Ground
  • B0685 GMC Security System Indicator Circuit Short to Ground

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