Chart D

Chart D:

SIR Wiring Diagram:

DESCRIPTION:

When the ignition switch is first turned "ON," system voltage is applied from fuse #1 to "SIR Indicator High," terminal B9 and to the "INFL REST" warning lamp which is connected to "SIR Indicator Low," terminal A1. Fuse #14 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 to the DERM at the "CRANK" input. The DERM grounds the lamp circuit 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 if the ignition switch is "ON."

TEST DESCRIPTION: Number(s) below refer to circled number(s) on the diagnostic chart.

1. Checks for system voltage at the "CRANK" input of the DERM during cranking.

2. Checks for the "CRANK" circuit for an open or high resistance.