Inspection and verification (Discovery 3)

1. Make sure the customer's complaint is justified.

2. Confirm which, if any, warning lights and/or messages are lit/displayed on the instrument panel. For a list of messages, refer to the relevant section in the workshop manual.

3. Visually inspect for obvious mechanical and electrical problems.

Mechanical factors	Electrical Factors
Air leak Pneumatic springs Receiver Compressor Compressor air filter Piping and connections Sensor installation valve blockage (ov)	Accumulator battery Fuse (And) Physical damage or water intrusion into the wiring harness Loose or corroded electrical connectors Air suspension control switch CAN electrical circuits (Control Area Network) Sensors valve blockage (ov) Air suspension control unit

4. If an obvious cause of a problem that you identified or described by the customer is found, resolve it before proceeding to the next steps (if possible).

5. Use an approved diagnostic system or scan tool (tester), to retrieve all DTCs before referring to the symptom table or DTC index (DTC). Clear all DTCs after troubleshooting.