Chart B

Chart B:

SIR System Diagram:

DESCRIPTION:

When the Ignition Switch is first turned "ON" system voltage is applied through fuse #16 to "SIR Indicator High" (B9) and to the "INFLATABLE RESTRAINT" Indicator Lamp which is connected to 'SIR Indicator Low" (A1). Fuse #3 also applies system voltage to the "IGNITION 1" inputs (A3 and B3). The DERM responds by blinking the "INFLATABLE RESTRAINT" indicator 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 a steady "INFLATABLE RESTRAINT" indicator during cranking.

After cranking the DERM will again blink the "INFLATABLE RESTRAINT" indicator 7 to 9 times.

NOTES ON FAULT TREE:

1. If flash codes have been used to diagnose and repair a fault, the code(s) diagnosed and repaired will still appear as history codes only. The only way to clear history codes is with a "scan tool".

2. Where diagnostic charts request the clearing of SIR codes, the step is to be skipped since codes cannot be cleared through flash code diagnostics.