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.
To diagnose the B1792 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.
With the headlamp switch turned to the AUTOLAMPS ON position, a battery voltage signal is sent to the Vehicle Security Module (VSM). The VSM monitors the input from the light sensor. The VSM then determines the amount of ambient light based on the input received from the light sensor. When the ambient level has reached a point relays are energized to supply voltage to the exterior lamps. The Diagnostic Trouble Code (DTC) will be set when the VSM detects a short to voltage on the Autolamp on the input circuit.
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