Here are the most common scenarios and how to address them:
* Resetting the PCM (Powertrain Control Module): This is the main computer that controls the engine and transmission. A simple reset often involves disconnecting the negative (-) terminal of the battery for about 30 minutes. This allows the computer's memory to clear. Reconnect the battery and start the car. This should reset learned parameters like idle speed and shift points. Caution: This will erase any customized settings or calibrations.
* Resetting the Check Engine Light: This light indicates a problem detected by the PCM. Disconnecting the battery will *sometimes* turn off the light, but only temporarily if the underlying problem remains. You need to diagnose and fix the problem causing the light to come on. An OBD-II scanner can help with this.
* Resetting the radio: If you're having trouble with the radio, many car stereos have their own reset procedures (often involving holding down specific buttons for a certain time). Check your owner's manual for the specific steps for your radio model.
* Other Modules: The Concorde also has other smaller computer modules controlling things like the climate control, airbags, and anti-lock brakes. These typically don't require user resets unless a specific problem arises and a dealer-level scan tool is needed.
In short: For most "computer" issues in a 1999 Chrysler Concorde, disconnecting the negative battery terminal for 30 minutes is the most likely solution. If this doesn't solve your problem, you'll need to identify the specific issue you're facing (e.g., a specific error code from the check engine light) and address it accordingly. Consulting your owner's manual is also highly recommended.
