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Air Bag Telltale
When ignition is switched On, system voltage is applied to terminal Al of the SDM from the IGN 1 fuse in the UHFB. The SDM self-checks the system voltage and deployment loops while the I/P cluster performs a bulb check by flashing the AIR BAG telltale seven times. If a diagnostic trouble code is detected, the SDM will command the I/P cluster to light the AIR BAG telltale when the bulb check is complete. If no DTC is detected, the telltale will not light. The SDM communicates with the I/P cluster on circuit 1807.