The P2522: A/C Request ‘B’ Circuit refers to an issue in the A/C request circuit ‘B’, which is responsible for signaling the vehicle’s control module to activate part of the air conditioning system. This issue could be due to a faulty A/C request control, wiring problems, or connector issues. Proper functioning of this circuit is critical to ensure the air conditioning system engages when requested for cooling.
P2522 – Quick Overview
Code | Information |
---|---|
Meaning | P2522: A/C Request ‘B’ Circuit |
Is it serious? | Moderately serious. It can prevent proper activation of the A/C system, leading to issues with cooling and passenger comfort. |
Possible causes | – Issues with the A/C request ‘B’ circuit – Faulty A/C request control – Wiring or connector problems |
How to diagnose? | – Inspect the A/C request ‘B’ circuit – Test the A/C request control – Check wiring and connectors – Replace faulty components if needed |
Code Meaning
The P2522: A/C Request ‘B’ Circuit code indicates that there is a malfunction in the A/C request ‘B’ circuit. This circuit is used by the vehicle’s control system to signal the air conditioning system to engage. A fault here can prevent the system from responding properly to requests, leading to inadequate cooling or failure to activate the A/C system when required.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to determine if there are any other related codes that might provide further insight into the problem affecting the A/C system. | OBD-II Scanner |
Inspect the A/C Request ‘B’ Circuit | Visually inspect the A/C request ‘B’ circuit for any visible damage. Look for issues like frayed wires, disconnected connectors, or signs of wear that could prevent the circuit from operating properly. | Flashlight, Safety Gloves |
Check Wiring and Connectors | Examine all wiring and connectors associated with the A/C request ‘B’ circuit. Ensure that all connections are secure and free from corrosion or damage. Repair any damaged wiring as needed. | Flashlight, Multimeter |
Test the A/C Request Control | Use a multimeter or diagnostic tool to test the A/C request control. Verify that it sends the correct signal when the A/C is engaged. Replace the control unit if it fails to provide the appropriate output. | Multimeter, Diagnostic Tool |
Verify Circuit Function | Use a diagnostic tool to activate the A/C request circuit ‘B’ and check if the A/C system responds appropriately. Observe whether the command from the control module results in activation or failure. | Diagnostic Tool |
Inspect for Short Circuits or Open Circuits | Check for open or short circuits in the A/C request ‘B’ wiring. An open circuit may prevent activation, while a short circuit could damage components. Use a multimeter to trace continuity through the wiring. | Multimeter |
Replace Faulty Components | Replace any faulty components found during the diagnostic process, such as the A/C request control unit, connectors, or damaged wiring. Ensure all replacements are OEM compatible to maintain system reliability. | Replacement Parts, Vehicle Owner’s Manual |
Clear the Code and Test the A/C System | After completing the necessary repairs, clear the P2522 code using an OBD-II scanner. Test the A/C system to ensure that it engages correctly and that the issue has been resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | Re-scan the vehicle to verify that the P2522 code has not returned. If the code persists, further investigation will be required to uncover the underlying cause. | OBD-II Scanner |

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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)