The GMC B320A 4B Code is a diagnostic trouble code that indicates a front door window motor calibration not learned. It is often triggered when a power window switch is activated, and can be caused by a loss of voltage in the B+ circuit or an open/high resistance in the serial data circuit. This code can also be triggered by an over temperature sub type, which is used by the control module to indicate the detection of an internal temperature above the expected range. Learning more about these causes and potential solutions can help diagnose the issue and get the window motor running again. To further explore the GMC B320A 4B Code, we have created a table of causes and solutions.
GMC B320A 4B Code: Causes and Solutions
| Cause | Solution |
|---|---|
| Loss of voltage in the B+ circuit | Check for loose connections and faulty components |
| Open/high resistance in the serial data circuit | Test the serial data circuit for resistance |
| Over temperature sub type | Check for debris and faulty components near the motor |
| Control module malfunction | Replace the control module |
Loss of Voltage in the B+ Circuit
When the GMC B320A 4B code is triggered, it is likely due to a loss of voltage in the B+ circuit. This can be caused by a number of issues, including loose connections, faulty components, or wiring in the window system. To diagnose this issue, a technician should check all connections and components in the window system and look for any signs of damage, corrosion, or loose connections.
Open/High Resistance in the Serial Data Circuit
Another common cause of the GMC B320A 4B code is an open/high resistance in the serial data circuit. This can be caused by a faulty component or wiring in the window system. To diagnose this issue, a technician should test the serial data circuit for resistance and look for any signs of damage or loose connections.
Over Temperature Sub Type
The GMC B320A 4B code can also be triggered by an over temperature sub type, which is used by the control module to indicate the detection of an internal temperature above the expected range. This can be caused by debris or faulty components near the motor, such as a fan or resistor. To diagnose this issue, a technician should check for debris and faulty components near the motor and look for any signs of damage or loose connections.
Control Module Malfunction
Finally, the GMC B320A 4B code can be triggered by a control module malfunction. This can be caused by a faulty component or wiring in the window system. To diagnose this issue, a technician should replace the control module and look for any signs of damage or loose connections.
Conclusion
The GMC B320A 4B Code can be triggered by a number of issues, including a loss of voltage in the B+ circuit, an open/high resistance in the serial data circuit, an over temperature sub type, or a control module malfunction. By learning more about these causes and potential solutions, it can help diagnose the issue and get the window motor running again. To correctly diagnose the GMC B320A 4B Code, it is important to check for loose connections, faulty components, debris, and wiring in the window system.
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