Chart B Air Bag Warning Lamp Comes on Steady

Electrical Diagram:

CIRCUIT DESCRIPTION
When the ignition switch is first turned "ON," system voltage is applied from fuse A9 to "SIR Indicator High," terminal B9 and to the "INFL REST" warning lamp which is connected to "SIR Indicator Low," terminal A1. Fuse A5 applies system voltage to the "Ignition 1" inputs, terminals A3 and B3. The DERM responds by flashing the "INFL REST" warning lamp 7 to 9 times.

When the engine is being cranked, system voltage is applied from fuse A11 to the DERM at the "Crank" input. The DERM responds by grounding the "SIR Indicator Low" output until system voltage is removed from the "Crank" input. This results in the "INFL REST" warning lamp being "ON" during cranking.

After cranking the DERM will again flash the "INFL REST" warning lamp 7 to 9 times.

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. An open fuse A5 would result in a loss of "Ignition 1" voltage to the DERM. The DERM will respond by grounding the "SIR Indicator Low," CKT 358 whenever the ignition switch is "ON".
2. A disconnected DERM harness connector will cause the "INFL REST" lamp to come on steady via the shorting bar from terminal "A1" to terminal "B1."
3. This test checks whether a short to ground caused fuse A5 to open.
4. This test checks for a short from the "SIR Indicator Low" circuit to ground.
5. This test determines whether the short to ground is due to a faulty arming sensor or a short in the wiring.
6. This test checks for an open in the "Ignition 1" circuitry to the DERM.
7. This test checks for a short from the "Crank" input circuit to B+.