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If the vehicle’s battery was not disconnected prior to the removal of the unit, it may inadvertently blow a relay near the fuse box, or a fuse in one of the multiple fuse boxes in the vehicle.
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Often times there are communication issues present if the unit is installed back in the vehicle. One of the fastest and easiest ways to clear any soft codes in the vehicle is to do a simple battery reset:
Steps to Perform a Hard Reset:
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Ensure Safety:
- Park Safely: Park your vehicle on a flat surface and engage the parking brake.
- Turn Off Engine: Ensure the engine is turned off and the keys are removed from the ignition.
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Disconnect the Battery:
- Locate the Battery: Open the vehicle’s hood and locate the battery.
- Disconnect the Negative Terminal: Use a wrench or socket to disconnect the negative (black) terminal of the battery first. Loosen the nut and remove the cable from the terminal.
- Disconnect the Positive Terminal: Repeat the process to disconnect the positive (red) terminal of the battery.
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Wait:
- Wait for 15-30 Minutes: Allow the vehicle to sit without power for at least 15-30 minutes. This ensures all electrical energy is discharged and the control modules are fully reset.
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Reconnect the Battery:
- Reconnect the Positive Terminal: Reattach the positive (red) cable to the battery terminal and tighten the nut securely.
- Reconnect the Negative Terminal: Reattach the negative (black) cable to the battery terminal and tighten the nut securely.
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Restart the Vehicle:
- Turn On the Engine: Start the vehicle’s engine and allow it to idle for a few minutes. This gives the vehicle’s electronic systems time to recalibrate and reset.
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Check for Issues:
- Verify Functionality: Check the vehicle’s electronic components and systems to ensure they are functioning correctly. This includes lights, dashboard indicators, radio, and other electrical features.