- 1). Open the hood of the car.
- 2). Disconnect the negative cable from the battery, using a wrench to loosen the lug nut on the terminal and pulling the cable off the post. Pull the cable out of the way to eliminate any risk of the cable accidentally falling and touching the battery post.
- 3). Disconnect the positive cable from the battery, using a wrench to loosen the lug nut on the terminal and pulling the cable off the post.
- 4). Open the driver's side door, press and hold down the horn until the sound of the horn stops completely. This will discharge the stored charge in the engine's control module capacitor and clear any error code from the control module's memory.
- 5). Reconnect the positive cable to the positive terminal of the battery and tighten the lock nut, using a wrench, until it is hand-tight.
- 6). Reconnect the negative battery cable to the negative terminal of the battery and tighten the lock nut, using a wrench, until it is hand-tight.
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