B1694 – OBD-II DTC

OBD-II DTC B1694 – Autolamp On Circuit Open

DTC B1694 meaning

DTC B1694 refers to a diagnostic trouble code indicating an open circuit in the autolamp on circuit. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle functions. The autolamp system is responsible for automatically turning on the vehicle’s headlights based on ambient light conditions. An open circuit means that there is a break in the electrical path, preventing the system from functioning correctly.

DTC B1694 symptoms

Common symptoms associated with DTC B1694 may include:

• Headlights not turning on automatically
• Dashboard warning lights illuminated
• Manual control of headlights required
• Inconsistent operation of the autolamp feature

DTC B1694 causes

Several factors can lead to the occurrence of DTC B1694, including:

• Faulty autolamp sensor
• Damaged wiring or connectors in the autolamp circuit
• Defective body control module (BCM)
• Corrosion or poor connections in the electrical system

DTC B1694 seriousness

The seriousness of DTC B1694 can vary. While it may not pose an immediate safety risk, it can lead to visibility issues during low-light conditions if the headlights do not operate as intended. It is advisable to address this issue promptly to ensure proper vehicle lighting and compliance with safety regulations.

How to diagnose DTC B1694

To diagnose DTC B1694, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the code.
2. Inspect the autolamp sensor and its wiring for any visible damage.
3. Check the body control module for any fault codes or issues.
4. Test the continuity of the wiring in the autolamp circuit.
5. Verify the operation of the autolamp feature manually.

How to fix DTC B1694 step-by-step instructions

To fix DTC B1694, follow these step-by-step instructions:

1. Inspect and repair any damaged wiring or connectors in the autolamp circuit.
2. Replace the autolamp sensor if it is found to be faulty.
3. Test and, if necessary, replace the body control module.
4. Ensure all connections are clean and free of corrosion.
5. Clear the DTC using an OBD-II scanner and test the autolamp system.

How to erase DTC B1694

To erase DTC B1694, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the option to clear or erase trouble codes on the scanner.
4. Confirm the action to erase the DTC.
5. Disconnect the scanner and start the vehicle to check if the code reappears.

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