1. Preparation:
* Disconnect the Battery: This is crucial to prevent short circuits and accidental damage. Disconnect the negative (-) terminal first.
* Gather Tools: You'll need a small flathead screwdriver (possibly a plastic one to avoid scratching), possibly a small Phillips head screwdriver, and a small flashlight. Needle-nose pliers might be helpful too.
2. Accessing the Control Unit:
* Remove the Bezel: The heater control unit is usually behind a bezel (plastic trim piece). This bezel is often secured by small clips. Carefully pry it loose using your flathead screwdriver, starting at the edges and working your way around. Be gentle! These clips can break easily. The bezel might also be held on by screws – check for these before prying.
* Disconnect the Control Unit: Once the bezel is removed, you should see the heater control unit itself. Carefully disconnect the wiring harnesses connected to the back of the unit. Take pictures or make a note of how each connector is plugged in before disconnecting to make reassembly easier.
3. Replacing the Bulbs (or LEDs):
* Identify the Bulbs/LEDs: The bulbs or LEDs are typically small wedge-base bulbs (like 194 or similar). Their location varies depending on the unit's design, but they're usually visible once the control unit is removed from the bezel.
* Remove the Old Bulbs/LEDs: Gently twist or pull out the old bulbs/LEDs. They might be fragile, so be careful.
* Install New Bulbs/LEDs: Insert the new bulbs/LEDs, ensuring they are correctly seated. Pay close attention to the orientation (some have a flat side, for example).
4. Reassembly:
* Reconnect the Control Unit: Carefully plug the wiring harnesses back into the control unit, matching them to your pictures or notes.
* Reinstall the Bezel: Carefully align the bezel and snap it back into place. Make sure all the clips engage securely.
* Reconnect the Battery: Reconnect the battery's negative (-) terminal.
Important Considerations:
* Bulb Type: Before you start, try to determine the type of bulb used in your Commander's heater controls. You can often find this information in a repair manual or online forums dedicated to Jeep Commanders. Don't assume all bulbs are the same; some may be different wattages or types.
* LED Conversion: You can often replace the original incandescent bulbs with LEDs, but ensure they are the correct size and type for your unit. Some LEDs may require resistors to prevent damage.
* Repair Manual: A repair manual specific to your 2007 Jeep Commander will provide detailed diagrams and instructions. This is the most reliable source of information. Online resources like YouTube may also have videos demonstrating the process.
If you're uncomfortable with this procedure, it's always best to take your Jeep to a qualified mechanic or auto electrician. Damaging the control unit during disassembly can be costly to repair.
