Service Diagnostics Check
- Enter diagnostics by pressing the "OFF" and the "WARM" buttons on the ECC for 3 seconds at the same time.
- Diagnostic codes begin with any ECM codes, followed by any BCM codes.
- To proceed with diagnostics, press the indicated ECC buttons.
- "HI" and "LOW" refer to the fan up and fan down buttons.
- Exit diagnostics by pressing the "BI-LEV" button.