Part 1

Chart C Part 1 Of 2:

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 determines whether the fault is in the DERM circuitry or in the IPC display circuitry.

2. This test checks whether power is available to the IPC.

3. This test checks for an open in the power feed circuit to the IPC.

4. This test checks for a short to ground which would cause fuse #15 to open.

5. This test checks for improper power feed connections to the IPC.

6. This test checks whether power is available to fuse #15.