The B1390 code indicates a problem with the ambient light control module in a vehicle. This code can be triggered by low battery voltage, a faulty control module, or poor electrical connections.
Symptoms of this code may include erratic or non-functioning ambient lighting, dim or flickering lights, or a complete loss of ambient light functionality.
To fix this issue, you should start by checking the battery voltage and ensuring it is within the proper range. Next, inspect the control module for any signs of damage or corrosion and replace if necessary.
Additionally, check all electrical connections related to the ambient light control module and ensure they are secure and free from any corrosion or damage.
If the issue persists, it may be necessary to seek professional help for further diagnosis and repair.
What does it mean
The B1390 code indicates an issue with the vehicle's system voltage. This can lead to performance problems and potential damage to components.
Other control modules in the vehicle may also be affected, impacting overall functionality.
Prompt diagnosis and resolution of the B1390 code are crucial for optimal vehicle performance and preventing further damage.
what are the symptoms
The B1390 code indicates potential issues with the ambient light control module or related components in the vehicle. Symptoms may include the engine light or service engine soon warning light turning on. It's important to note that this code itself does not directly impact the vehicle's performance. Instead, it serves as a diagnostic trouble code highlighting a possible problem in the electrical system.
Here are some important points to consider about the B1390 code and its effects on the vehicle:
- The B1390 code is linked to the ambient light control module, which regulates the vehicle's interior and exterior lighting based on ambient light conditions.
- The B1390 code does not cause any specific performance problems in the vehicle.
- However, if not addressed promptly, the underlying electrical issue that triggered the B1390 code may result in other electrical complications, such as malfunctioning lights or problems with other electrical components.
- It's crucial to diagnose and fix the B1390 code promptly to prevent further electrical complications in the vehicle.
What are the causes
Possible causes of the B1390 code may include:
- Low battery voltage
- Faulty control module
- Problem with the control module harness (such as an open or short circuit)
- Poor electrical connection in the control module circuit
- Incorrect value in the signal protection calculation of the ambient light control module
- Missing message in the ambient light control module.
To diagnose the B1390 code, you can follow these steps:
- Check the potential causes mentioned above.
- Visually inspect the wiring harness and connectors related to the issue.
- Check for any damaged components.
- Look for any broken, bent, pushed out, or corroded connector pins.
Common mistakes in diagnosing the B1390 code include:
- Overlooking loose or corroded connections
- Neglecting to check the battery voltage
- Not inspecting the control module harness for signs of damage.
It is crucial to thoroughly inspect all relevant components and connections to accurately diagnose and fix the problem causing the B1390 code.
What Tools are Needed to diagnose
To diagnose the B1390 code effectively, you will need specific tools for the job. These tools are necessary to identify the underlying issue and provide an accurate diagnosis. Here are the tools required for diagnosing the B1390 code:
- OBD-II scanner: This tool is used to retrieve the trouble codes stored in the vehicle's control module.
- Multimeter: A multimeter helps measure voltage, resistance, and continuity in the electrical circuits associated with the B1390 code.
- Wiring diagram: You will need a wiring diagram to locate the circuits and components involved in the B1390 code.
- Inspection mirror and flashlight: These tools are handy for visually inspecting the wiring harness and connectors, checking for any signs of damage or corrosion.
- Oscilloscope: In some cases, an oscilloscope may be necessary to analyze the electrical signals and waveforms within the system.
Proper diagnosis is essential when dealing with the B1390 code. By using the correct diagnostic tools, you can ensure accurate results and prevent unnecessary repairs or component replacements. These tools allow technicians to pinpoint the exact cause of the code and address it effectively, saving both time and money for the vehicle owner.
How to fix Step by Step
Step 1: Begin by checking the possible causes mentioned earlier, such as low battery voltage, a faulty control module, an open or shorted control module harness, or poor electrical connections.
Step 2: Visually inspect the wiring harness and connectors for any signs of damage. Look for broken, bent, pushed out, or corroded connector pins.
Step 3: Thoroughly inspect the vehicle's electrical system to ensure all components are in working order.
Step 4: Diagnose the B1390 code accurately to avoid any misdiagnosis. Take your time and follow the proper diagnostic procedures.
Step 5: Avoid common mistakes such as overlooking damaged components or ignoring poor electrical connections. Pay attention to even the smallest details during the diagnosis process.
Step 6: Once the issue has been identified, take the necessary steps to fix it. This may involve repairing or replacing damaged components, fixing poor electrical connections, or addressing any other underlying problems.
Step 7: After fixing the issue, clear the B1390 code from the vehicle's system using a diagnostic tool or by disconnecting the battery for a few minutes.
Step 8: Test the vehicle to ensure that the B1390 code has been successfully resolved and that any associated symptoms, such as the engine light being on, have been eliminated.
What are the Common Diagnosis Mistakes
Common Diagnosis Mistakes and How to Avoid Them
One mistake that is often made when diagnosing the B1390 code is not taking into account damaged components or disregarding poor electrical connections. To prevent these common diagnosis mistakes, it is important to consider the following steps:
- Make sure to check the battery voltage: The B1390 code can be triggered by low battery voltage. Therefore, it is crucial to check the voltage level before moving on to further diagnostics.
- Don't forget to inspect the control module: A faulty control module can also be the cause of the B1390 code. It is essential to thoroughly inspect the control module for any signs of damage or malfunction.
- Check the control module harness: An open or shorted control module harness can lead to the B1390 code. Therefore, it is important to inspect the harness for any signs of damage or improper connections.
- Pay attention to poor electrical connections: Poor electrical connections can also cause the B1390 code to appear. It is necessary to carefully examine all electrical connections for any signs of corrosion, bent pins, or loose connections.
- Perform a visual inspection of the wiring harness and connectors: By visually inspecting the wiring harness and connectors, you can identify any physical damage or issues that may be contributing to the B1390 code.
What is the Repair Cost
The repair cost for the B1390 code can vary based on factors such as labor rates and necessary repairs. Labor costs typically range between $75 and $150 per hour.
However, this only covers the diagnostic stage; additional expenses may be incurred for repairs. The final cost depends on the specific cause of the code and the required fixes.
Accurate diagnosis is crucial for a cost-effective repair.
Can I drive safely with this code?
It is not recommended to drive with the B1390 code.
This code indicates an issue with the Ambient Light Control Module, which can lead to engine light illumination and potential damage to components.
It is advised to have the vehicle inspected and repaired by a qualified technician to ensure safety and prevent further damage.
Conclusion
In conclusion, the B1390 code indicates a problem with the ambient light control module in a vehicle. This code can be triggered by various factors such as low battery voltage, a faulty control module, or poor electrical connections.
Promptly addressing this code is crucial to prevent damage to components and ensure accurate data. It is recommended to visually inspect the wiring harness and connectors for any damage or corrosion.
The cost to diagnose and repair the B1390 code can vary depending on the labor charges of auto repair shops.