B1792 – OBD-II DTC

OBD-II DTC B1792 – Autolamp Sensor Input Circuit Short To Battery

DTC B1792 meaning

DTC B1792 refers to a diagnostic trouble code indicating a short circuit in the autolamp sensor input circuit to the battery. This code is typically associated with the vehicle’s lighting system, specifically the automatic headlight control feature. When the vehicle’s onboard diagnostics detect that the voltage level in the autolamp sensor circuit is higher than expected, it triggers this code.

DTC B1792 symptoms

Common symptoms associated with DTC B1792 may include:

• Automatic headlights not functioning properly
• Headlights remaining on or off when they should change
• Dashboard warning lights illuminated
• Inconsistent lighting behavior

DTC B1792 causes

Several factors can lead to the triggering of DTC B1792, including:

• Short circuit in the autolamp sensor input circuit
• Faulty autolamp sensor
• Damaged wiring or connectors in the circuit
• Corrosion or poor connections at the sensor or control module
• Malfunctioning body control module (BCM)

DTC B1792 seriousness

The seriousness of DTC B1792 can vary. While it may not pose an immediate safety risk, it can lead to improper functioning of the vehicle’s lighting system, which can be hazardous, especially during nighttime driving or adverse weather conditions. It is advisable to address this issue promptly to ensure safe vehicle operation.

How to diagnose DTC B1792

To diagnose DTC B1792, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC B1792.
2. Inspect the autolamp sensor and its wiring for visible damage or corrosion.
3. Check the voltage and ground at the autolamp sensor connector.
4. Test the autolamp sensor for proper operation using a multimeter.
5. Examine the body control module for any related fault codes.
6. Perform a continuity test on the wiring between the sensor and the BCM.

How to fix DTC B1792 step-by-step instructions

To fix DTC B1792, follow these steps:

1. Clear the DTC using an OBD-II scanner.
2. If the code reappears, inspect the wiring and connectors for damage.
3. Repair or replace any damaged wiring or connectors.
4. Test the autolamp sensor and replace it if it is faulty.
5. Check the body control module for proper function and replace if necessary.
6. Recheck the system to ensure the code does not return.

How to erase DTC B1792

To erase DTC B1792, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “On” position without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the vehicle to check if the code returns.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.