GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 DeVille 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Diagnostic Trouble Code (DTC) Clearing

Perform the following steps in order to clear the DTCs using the Scan Tool method:

    • Select ACM.
    • Select DTC.
    • Select CLEAR CODES.
    • Press the YES button in order to clear the codes.

Perform the following steps in order to clear the DTCs using the on-board diagnostic method:

  1. Press one of the following combinations:
    2. • For digital IPC, press OFF and WARMER.
    • For analog IPC, press OFF and PASSENGER WARMER.
  2. Press the LO (fan speed) button until ACM? appears.
  3. Press the HI (fan speed) button until ACM CODES? appears.
  4. Press the LO (fan speed) button until ACM CLEAR CODES? appears.
  5. Press HI (fan speed) in order to clear the codes. ACM CODES CLEAR will appear.