The B1336 code is a diagnostic trouble code that indicates a problem with the Smart Junction Box (SJB) in certain Ford, Infiniti, Lincoln, Mercury, and Nissan vehicles. This code is triggered when the SJB detects an open circuit from the right rear door ajar input.
Symptoms of the B1336 code may include the right rear door ajar warning light staying on, difficulty in locking or unlocking the right rear door, or the interior lights not turning off when the door is closed.
Common causes of the B1336 code can include a faulty door ajar switch, a damaged wiring harness, or a malfunctioning SJB.
To fix the B1336 code, start by inspecting the wiring and connections related to the right rear door ajar switch. Repair or replace any damaged or corroded wires or connectors. If the wiring appears to be in good condition, the next step is to test the door ajar switch using a multimeter. If the switch is faulty, it will need to be replaced.
If the door ajar switch and wiring are in good working order, the SJB may be at fault. In this case, it is recommended to seek professional assistance for further diagnosis and potential replacement of the SJB.
It is important to note that diagnosing and repairing the B1336 code may require specialized tools and knowledge. Therefore, it is recommended to consult a qualified automotive technician for an accurate diagnosis and proper repair.
What does it mean
The B1336 code indicates a voltage signal problem in the Smart Junction Box (SJB) related to the right rear door ajar input circuit.
This can cause the Engine Light to come on and lead to issues like interior lights staying on when the door is closed.
It's important to address the root cause to maintain optimal vehicle performance.
what are the symptoms
The B1336 code may cause the Engine Light to turn on and the interior lights to stay on even when the door is closed. These symptoms suggest a problem with the Smart Junction Box (SJB) and the door ajar switches.
To avoid the B1336 code from happening again, it is important to address the underlying issues that are causing it. This can be done by checking the right rear switch for the door ajar, inspecting the wiring harness and connectors for any damage, and ensuring that there are no broken, bent, pushed out, or corroded connector pins.
To reset the B1336 code, you can disconnect the vehicle's battery for a few minutes. However, it is recommended to use a diagnostic tool for a more accurate diagnosis and to properly reset the code.
What are the causes
To understand the causes of the B1336 code, we need to look at possible issues with the door ajar right rear switch, wiring harness, connectors, and the smart junction box (SJB). Here are some ideas on what could be causing the problem:
- Electrical problems that may be causing the B1336 code:
- The door ajar right rear switch could be faulty.
- The wiring harness for the door ajar right rear switch may be open or shorted.
- There might be a poor electrical connection in the door ajar right rear switch circuit.
- How to identify and troubleshoot a faulty Smart Junction Box (SJB) as a cause of the B1336 code:
- Take a visual inspection of the related wiring harness and connectors to check for any damage.
- Look for broken, bent, pushed out, or corroded connector pins.
What Tools are Needed to diagnose
To diagnose the B1336 code, technicians will need specific tools for a thorough inspection and accurate troubleshooting. Here are the common diagnostic tools for diagnosing the B1336 code:
- OBD-II scanner: This tool is used to retrieve the trouble codes stored in the vehicle's onboard computer system.
- Multimeter: A multimeter is essential for testing the voltage and continuity of the electrical circuits related to the Smart Junction Box (SJB) and the door ajar switches.
To troubleshoot the Smart Junction Box (SJB) for the B1336 code, technicians can follow these steps:
- Inspect the wiring harness and connectors connected to the SJB for any signs of damage or corrosion.
- Use the multimeter to test the voltage signal from the SJB to the door ajar switches.
- Check for any loose or poor electrical connections.
- If necessary, replace the faulty SJB or door ajar switches to resolve the issue.
How to fix Step by Step
Step 1: Inspect the wiring harness and connectors connected to the Smart Junction Box (SJB) for any signs of damage or corrosion.
Step 2: Check for any broken, bent, pushed out, or corroded connector pins.
Step 3: Ensure that all connections are secure and in good condition.
Step 4: Regularly inspect the wiring harness and connectors, keeping them clean and free from any debris or moisture.
Step 5: Promptly address any signs of damage or corrosion to prevent the code from reappearing.
What are the Common Diagnosis Mistakes
Common diagnosis mistakes can make it difficult to accurately identify and resolve the B1336 code. To prevent this code from appearing in the future, it's important to avoid the following common mistakes:
- Misdiagnosing the problem as a faulty door ajar switch without thoroughly inspecting the related wiring and connectors.
- Not visually inspecting for damaged components or broken, bent, pushed out, or corroded connector pins.
It's also important to be aware of common issues with the Smart Junction Box (SJB) that can cause the B1336 code. The SJB is responsible for sending a voltage signal to the door ajar switches, so a faulty SJB can lead to incorrect readings and trigger the B1336 code.
What is the Repair Cost
The potential cost of repairing the B1336 code varies depending on factors such as labor, location, vehicle make and model, and engine type. Auto repair shops typically charge between $75 and $150 per hour for diagnosis and repair.
It is important to consider the cost of parts and the potential expenses of a DIY repair. Professional repair is recommended for proper diagnosis and fixing of the B1336 code.
Can I drive safely with this code?
Driving with the B1336 code can be unsafe as it indicates a fault in the Smart Junction Box (SJB) affecting the door ajar switches. This can lead to further damage, malfunction, and compromised safety features.
Consult the factory service manual and use specialized tools for diagnosis and repair.
Conclusion
In conclusion, the B1336 code indicates an issue with the right rear door ajar input circuit in certain Ford, Infiniti, Lincoln, Mercury, and Nissan vehicles. This code can cause the engine light or service engine soon warning light to illuminate.
The potential causes of this code include a faulty switch, a damaged wiring harness, poor electrical connections, or a faulty Smart Junction Box.
It is important to inspect and repair these components to resolve the issue.