The compressor motor in that car's air suspension system is activated by a combination of factors:
* Air pressure sensors: These sensors monitor the pressure in each air spring. If the pressure drops below a certain threshold, they signal the compressor to turn on.
* Compressor relay: This relay acts as an electrical switch, activating the compressor motor based on signals from the pressure sensors and the car's computer (PCM). It's often located in a fuse box, possibly under the hood or in the passenger compartment.
* The PCM (Powertrain Control Module): The car's computer plays a crucial role. It receives input from the pressure sensors and activates the relay to power the compressor. Problems with the PCM can prevent the compressor from running.
* Wiring and fuses: Faulty wiring, corroded connections, or blown fuses in the compressor circuit can prevent it from working.
Troubleshooting Steps:
1. Check the fuses: Inspect the fuses related to the air suspension system (check your owner's manual or a wiring diagram).
2. Listen for the compressor relay click: When you try to activate the system (by trying to adjust the ride height if there are controls, or simply by waiting), listen near the relay (if you can locate it) for a clicking sound. No click suggests a relay issue or wiring problem.
3. Check the air pressure in the suspension bags: If they are completely flat, the system *should* activate the compressor to re-inflate them. If not, this points to a problem with sensors, wiring, or the relay/PCM.
4. Inspect the wiring: Look for broken, corroded, or loose wires connecting the compressor, the pressure sensors, the relay, and the PCM.
5. Test the air pressure sensors: This requires a specialized tool or a visit to a mechanic.
6. Diagnose the PCM: This is best done by a mechanic using a scan tool to check for any fault codes related to the air suspension.
In short: There's no simple "on/off" switch. The system is automated and relies on various components working together. If your compressor isn't running after replacing the pump, the problem likely lies elsewhere in the system's electronics or sensors, not a switch. You'll need to systematically troubleshoot to find the cause. A mechanic with experience working on air suspension systems is your best bet for a timely diagnosis and repair.
