1999 Town Car Transmission Control Switch: A Comprehensive Guide

The transmission control switch in a 1999 Town Car is a critical component that allows the driver to shift gears and control the transmission. When the switch fails, it can cause a variety of problems, including difficulty shifting gears, transmission slippage, and even a complete loss of power. In this guide, we will provide a comprehensive overview of the 1999 Town Car transmission control switch, including its location, function, and common problems.

Location of the Transmission Control Switch

The transmission control switch is located on the center console of the 1999 Town Car. It is typically positioned next to the gear selector lever. The switch is a small, rectangular-shaped component with a series of buttons or levers that allow the driver to select different gears.

Function of the Transmission Control Switch

The transmission control switch sends signals to the transmission control module (TCM), which then controls the operation of the transmission. The switch allows the driver to select different gears, including Park (P), Reverse (R), Neutral (N), Drive (D), and Overdrive (OD). The switch also allows the driver to select different driving modes, such as Sport mode and Snow mode.

Common Problems with the Transmission Control Switch

The transmission control switch is a relatively reliable component, but it can fail over time. Some of the most common problems with the switch include:

• Difficulty shifting gears: When the transmission control switch fails, it can make it difficult to shift gears. The switch may not send the correct signals to the TCM, which can cause the transmission to shift gears incorrectly or not at all.
• Transmission slippage: If the transmission control switch fails, it can also cause the transmission to slip. This can occur when the switch does not send the correct signals to the TCM, which can cause the transmission to shift into the wrong gear or not shift at all.
• Complete loss of power: In some cases, a failed transmission control switch can cause a complete loss of power. This can occur when the switch does not send any signals to the TCM, which can cause the transmission to stop working completely.

Troubleshooting Transmission Control Switch Problems

If you are experiencing any of the symptoms listed above, it is important to troubleshoot the transmission control switch. Here are a few steps you can follow to troubleshoot the switch:

1. Check the fuses: The first step is to check the fuses for the transmission control switch. The fuses are located in the fuse box under the hood of the car. If any of the fuses are blown, replace them with new fuses of the same amperage.
2. Inspect the wiring: Once you have checked the fuses, you should inspect the wiring for the transmission control switch. Look for any loose or damaged wires. If you find any damaged wires, repair them or replace them as necessary.
3. Test the switch: If the fuses and wiring are good, you can test the switch itself. To do this, you will need a multimeter. Set the multimeter to the ohms setting and connect the leads to the terminals on the switch. The switch should have a resistance of between 0 and 10 ohms. If the switch has a resistance of infinity, it is faulty and needs to be replaced.

Replacing the Transmission Control Switch

If you have determined that the transmission control switch is faulty, you will need to replace it. Here are the steps on how to replace the switch:

1. Disconnect the battery: Before you begin working on the transmission control switch, you need to disconnect the battery. This will prevent any electrical shocks.
2. Remove the center console: The center console needs to be removed to access the transmission control switch. To remove the center console, first remove the screws that hold it in place. Then, carefully lift the center console up and out of the car.
3. Locate the transmission control switch: The transmission control switch is located on the center console, next to the gear selector lever. The switch is a small, rectangular-shaped component with a series of buttons or levers.
4. Disconnect the electrical connector: The transmission control switch is connected to the TCM by an electrical connector. To disconnect the connector, simply squeeze the release tab and pull the connector apart.
5. Remove the transmission control switch: The transmission control switch is held in place by two screws. Remove the screws and then pull the switch straight out of the center console.
6. Install the new transmission control switch: Insert the new transmission control switch into the center console. Align the switch with the mounting holes and then tighten the two screws.
7. Reconnect the electrical connector: Connect the electrical connector to the transmission control switch. Make sure that the connector is fully seated.
8. Reinstall the center console: Carefully lift the center console back into place and then secure it with the screws.
9. Reconnect the battery: Reconnect the battery terminals.

Conclusion

The transmission control switch is a critical component in the 1999 Town Car. When the switch fails, it can cause a variety of problems, including difficulty shifting gears, transmission slippage, and even a complete loss of power. If you are experiencing any of these symptoms, it is important to troubleshoot the transmission control switch and replace it if necessary.