Chart D

Chart D:

SIR Wiring Diagram:

DESCRIPTION:

When the ignition switch is first turned "ON", system voltage is applied from fuse #15 to "SIR Indicator High", terminal B9 and to the "INFL REST" warning lamp which is connected to "SIR Indicator Low", terminal A1. Fuse #12 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 #11 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. This test checks whether the fault is due to an open fuse #11.

2. This test checks for a proper signal to the "Crank" input during cranking.

3. This test checks whether fuse #11 is open due to a short to ground in the "Crank" input circuit.

4. This test determines whether the lack of a proper crank signal is due to an open "Crank" input circuit or an open power feed to fuse #11.

5. This test determines whether the short to ground is in the wiring harness or in the DERM.