Chart B Indic Illum Steady, Key In ACC/on & DTC Diag Enabled

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
When the ignition switch is first turned to "OFF/UNLOCK" or "RUN," "Ignition 1" voltage is applied from "CLS/PCM" fuse to the "Indicators" bus in the IPC. The ground side of the "AIR BAG" indicator (LED) is controlled by the instrument cluster microprocessor. When the ignition switch is in the "OFF/UNLOCK" position, the serial data line (CKT 800) is not operative. This condition will cause the IPC microprocessor to turn the "AIR BAG" (as well as the "SEAT BELT") indicator "ON" steady.

When the ignition switch is first turned to "RUN," the "AIR BAG" fuse applies system voltage to the "Ignition 1" input, terminal "10." The SDM responds by flashing the "AIR BAG" indicator (via the serial data line) seven times. If "Ignition 1" is outside of the normal operating voltage range, the "AIR BAG" indicator will come "ON" steady with no DTCs set.

CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks for an open in the "Ignition 1" circuitry to the SDM.
2. This test checks for proper voltage to the SDM.
3. This test checks for a malfunction in the serial data line (CKT 800).
4. This test checks for proper connection at the SDM.
5. An open "AIR BAG" fuse would cause the "AIR BAG" indicator to come "ON" steady.
6. This test checks for an open in the "ignition 1" circuit.
7. This checks if a short to ground caused the "AIR BAG" fuse to open.
8. This test determines if a short to ground is due to a short in the wiring.