Hi there, I am new to this forum stuff. I'll keep this post short. My father got a new battery for my 2004 grey rx8 and connected the battery wrong. He connected the positive end of the car to the negative end of the battery and the negative end of the car to the positive **** of the battery. I read other similar posts that talk about the same situation. I checked and only 2 fuses got blown. I replaced them. I am still wondering if the ECU is fried. I try turning on the car, but it won't turn over, The only thing that does turn on are the dashboard lights, the radio is completely dead (won't turn on at all).
Anyone has any advice on this ?

 

did you check all the fuses? are the terminals tight? you would blow a fuse before the ecu

 

Did you check the 120amp main fuse? It's a bit strange to find and usually the first to blow when you do that...

 

 

Understanding the Potential Damage

Connecting a battery's terminals incorrectly can potentially cause significant damage to electronic components in a vehicle. The ECU (Engine Control Unit), being a crucial component responsible for managing various engine functions, is particularly vulnerable.

Signs of ECU Damage

Based on your description, the following symptoms suggest potential ECU damage:

• No engine cranking: This is a common indicator of ECU malfunction or damage.
• Radio failure: While the radio might be a separate component, it's often controlled by the ECU, so its failure could be related.

Troubleshooting Steps

1. Check for Additional Fuses: Ensure that all fuses, especially those related to the engine and ignition systems, are intact. A blown fuse could prevent the ECU from receiving power.
2. Verify Battery Connection: Double-check that the battery terminals are correctly connected, with positive to positive and negative to negative.
3. Scan for Diagnostic Codes: If possible, use an OBD-II scanner to read any diagnostic codes. These codes can provide clues about the root cause of the problem, including potential ECU issues.
4. Consult a Mechanic: Given the complexity of automotive electronics, it's often advisable to consult a professional mechanic. They can use specialized diagnostic tools to assess the ECU's condition and determine if it needs to be replaced or repaired.

Preventive Measures

To avoid similar issues in the future:

• Label Terminals: Clearly label the battery terminals to prevent accidental misconnections.
• Use a Battery Disconnect Switch: Consider installing a battery disconnect switch to isolate the battery when working on the vehicle.
• Consult a Manual: Refer to your vehicle's owner's manual for specific instructions on battery replacement and maintenance.

Remember, attempting to repair electronic components without proper knowledge or tools can lead to further damage. It's best to seek professional assistance if you're unsure about the cause or solution to the problem.

 

 

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