Circuit Description

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.

When ignition switch is turned to RUN position, IGNITION POSITIVE VOLTAGE is applied to Instrument Panel Cluster (IPC). SDM responds by flashing AIR BAG warning light 7 times. At this time, SDM performs POWER-ON tests followed by RESISTANCE MEASUREMENT test and CONTINUOUS MONITORING tests. If SDM detects malfunction, SDM commands IPC to turn AIR BAG warning light on. SDM clears current diagnostic trouble codes and moves them to a history file when malfunction is no longer detected or ignition switch is cycled, except for DTCs B1151, B1152, 1153 and B1171. DTCs B1151 and B1153 can only be cleared using scan tool CLEAR CODES. DTC B1152 clears from current DTCs to enable diagnosis, but latches as a history DTC. DTC B1171 may not clear after CLEAR CODES is received.