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Home >> Cadillac >> 1997 >> Seville STS >> Repair and Diagnosis >> External Pages >> Different car >> Section 28 (A/C - Heater System) >> Testing >> A/C-Heater Programmer (ACM) Self-Diagnostics >> Fault Detection

Fault Detection

WARNING: This page is about a different car, the 1998 Cadillac Eldorado and 1998 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.

If ACM detects a system fault, the Vacuum Fluorescent (VF) display on climate control panel will flash one time per second for 100 seconds. See Figure. If a fault occurs in outside temperature sensor circuit, VF display will not flash, but outside temperature will be displayed as a series of dashes.

NOTE: ACM and Climate Control Panel (CCP) store self-diagnostic trouble codes used to identify source of any system malfunction. Diagnostic Trouble Codes (DTCs) are designed to identify malfunction as specifically as possible, including type of DTC (current or non-current history).
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