Chart B Warning Lamp Comes On Steady

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
With the ignition key in the "OFF-UNLOCK" position, the "AIR BAG" warning lamp will be illuminated steady. When the ignition switch is first turned "ON," the "AIR BG1" fuse applies system voltage to the "Ignition 1" inputs, terminals "A9" and "A10." The DERM responds by commanding the instrument cluster, via serial data, to flash the "AIR BAG" warning lamp seven times. If serial data communication is lost between the DERM and the instrument cluster, the "AIR BAG" warning lamp will come on solid with a DTC 61 set. If "Ignition 1" voltage to the DERM is outside the normal operating range, the "AIR BAG" warning lamp will come "ON" solid with no DTC's set.

When the engine is being cranked, "Ignition 1" voltage is applied from the "AIR BG2" fuse to the DERM at the "CRANK" input. The DERM responds by commanding the instrument cluster to turn the "AIR BAG" warning lamp "ON" steady. This results in the "AIR BAG" warning lamp being "ON" during Cranking.

After cranking, the DERM will command the instrument cluster to flash the "AIR BAG" warning lamp six times.

CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. An open "AIR BG1" fuse would cause the "AIR BAG" warning lamp to come "ON" steady.
2. A disconnected DERM harness connector will cause the warning lamp to come "ON" steady via the shorting bar from terminal "A1" to terminal "B1".
3. This test checks for an open in the "Ground" circuitry to the DERM.
4. This test checks for an open in the "Ignition 1" circuitry to the DERM.
5. This test checks for a short from the "Crank" input circuit to B+.
6. This test checks whether a short to ground caused the "AIR BG 1" fuse to open.
7. This test determines whether the short to ground is due to a malfunctioning dual pole arming sensor or a short in the wiring.