Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2023SILVERADO 1500 HIGH COUNTRY, 5.3L ENG VIN D, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTHEADLIGHTSLIGHTING SYSTEM - DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC INFORMATION AND PROCEDURESDTC B1A75 (LIGHTING CONTROL MODULE)CIRCUIT/SYSTEM TESTING
2023 Chevrolet Silverado 1500 High Country, 5.3L Eng VIN D, 4WD
Circuit/System Testing
2023 Chevrolet Silverado 1500 High Country, 5.3L Eng VIN D, 4WDSECTION Circuit/System Testing
- Ignition OFF, exterior lamps OFF, disconnect the E6 Center High Mounted Stop Lamp.
- Verify a test lamp illuminates between ground circuit terminal 3 and B+.
- If the test lamp does not illuminate
- Repair the open/high resistance on the ground circuit or ground connection.
- Go to next step: If the test lamp illuminates
- Connect a test lamp between control circuit terminal 2 and ground, ignition on/vehicle in service mode.
- Verify the test lamp turns ON and OFF when commanding the Center High Mounted Stop Lamp ON and OFF with the scan tool.
- If the test lamp is always OFF
- Test circuit 820 for an open/high resistance
- If an open/high resistance is found, repair the fault on the circuit
- Go to next step: If an open/high resistance is not found
- Test circuit 820 for a short to ground
- If a short to ground is found, repair the fault on the circuit
- Go to next step: If a short to ground is not found
- Replace the K219 Lighting Control Module.
- If the test lamp is always ON
- Test circuit 820 for a short to voltage
- If a short to voltage is found, repair the fault.
- Go to next step: If a short to voltage is not found.
- Replace the K219 Lighting Control Module.
- Go to next step: If the test lamp turns ON and OFF
- Replace the E6 Center High Mounted Stop Lamp.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.