Instead of a general reset, you need to determine *why* you think the BCM needs resetting. Common symptoms that might point to BCM issues include:
* Electrical problems: Intermittent problems with lights, power windows, locks, power seats, or other electrical accessories.
* Communication errors: Your check engine light might be on, accompanied by diagnostic trouble codes (DTCs) related to communication issues within the vehicle's network.
* Security system issues: Problems with the key fob, remote unlocking, or the anti-theft system.
How to approach the problem:
1. Diagnose the problem: Identify the specific electrical or system malfunction you're experiencing. Be as detailed as possible.
2. Check fuses and relays: Before assuming a BCM issue, ensure all relevant fuses and relays are intact and functioning correctly. A blown fuse or faulty relay might be the simpler cause of your problem. Consult your owner's manual for fuse box locations and diagrams.
3. Obtain diagnostic trouble codes (DTCs): Use an OBD-II scanner to retrieve any diagnostic trouble codes stored in the vehicle's computer system. These codes will provide valuable clues to pinpoint the problem. Many inexpensive OBD-II scanners are available.
4. Battery disconnect: This is often suggested as a "reset," but it's more of a power cycle. Disconnect the negative (-) battery terminal for at least 15-30 minutes. This allows the BCM's memory to clear. Reconnect the battery and see if the problem is resolved. Note: This might reset your radio presets and other personalized settings.
5. Professional diagnosis: If the problem persists after checking fuses, relays, and performing a battery disconnect, it's best to take your Cavalier to a qualified mechanic or automotive electrician. They have specialized diagnostic tools to identify if the BCM is actually faulty and can perform more advanced troubleshooting and repairs, including BCM reprogramming if necessary.
Important Note: Simply disconnecting the battery might not fix a genuinely faulty BCM. A damaged BCM requires professional attention and may need to be replaced or repaired. Attempting complex repairs yourself without proper knowledge and tools can cause further damage.
