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.

Fig 1: Service Diagnostics Check (Toronado)