Chart C - Air Bag Warning Light Does Not Come "On": Description

When the ignition is first turned "ON" Ignition 1 voltage is applied to the AIR BAG warning light which is connected to the WARN 1 terminal A9 of the SDM. The AIR BAG fuse applies system voltage to the Ignition 1 input terminal A7 of the SDM. The SDM responds by flashing the AIR BAG warning light seven times by providing a ground. If Ignition 1 is outside the normal operating voltage range (approximately 6.64 VDC to 16 VDC), the AIR BAG warning light will come on solid with no diagnostic trouble codes set.

1. Verifies the bulb check for the "Service Engine Soon" light (MIL).
2. Verifies that the AIR BAG warning light will turn ON with the shorting bar at the SDM connector engaged.
3. Verifies the IGN 1 fuse.
4. Verifies circuit 39E, the AIR BAG warning light bulb and circuit 358.
5. Checks for a short to ignition from circuit 358 or an internal SDM failure.
6. Checks the instrument cluster connector and the AIR BAG warning light bulb.
   Fig 1: Chart C - Air Bag Warning Light Does Not Come "ON" (1 Of 3)

   Courtesy of GENERAL MOTORS CORP.
7. Verifies the continuity of circuit 358.
8. Verifies IGN 1. 14 & 15) Verify the continuity of circuit 39E.

Fig 2: Chart C - Air Bag Warning Light Does Not Come "ON" (2 Of 3)

Courtesy of GENERAL MOTORS CORP.

Fig 3: Chart C - Air Bag Warning Light Does Not Come "ON" (3 Of 3)

Courtesy of GENERAL MOTORS CORP.