Chart A1 History Code Diagnosis

DESCRIPTION
When Ignition Switch is first turned "ON" system voltage is applied through Fuse #6 to "Redundant Indicator Ignition 1" input (B2) and "INFLATABLE RESTRAINT" warning lamp which is connected to "SIR Indicator" output (B1). Fuse #7 also applies system voltage to "IGNITION 1" inputs (A9 and A10). DERM responds by blinking "INFLATABLE RESTRAINT" warning lamp 7 times.

When engine is being cranked system voltage is applied to DERM at "CRANK" input (B10). DERM grounds lamp circuit until system voltage is removed from "CRANK" input (B10). This results in a steady "INFLATABLE RESTRAINT" warning lamp during cranking.

After cranking, DERM again blinks "INFLATABLE RESTRAINT" warning lamp 7 times, with solid "ON" of warning lamp during "CRANK" counting as one.

NOTES ON FAULT TREE
Refer to "Intermittents and Poor Connections" to properly check terminals and connections.
1. Checks Dual Pole Arming Sensor for a loose connection, which may cause a history DTC to set.
2. Checks for an intermittent open and poor connections in "Pass Side Low" and "Driver Side Low" circuits, between DERM and either Passenger Inflator Module or steering column connectors respectively.
3. Checks for an intermittent short between "Pass Side High" and "Driver Side High" circuits.
4. Checks for an intermittent short between "Pass Side High" circuit and either "Driver Side Low" or "Pass Side Low" circuit. Also checks Passenger Inflator Module connector for a loose connection, which may cause shorting bar to set a history DTC.
5. Checks Passenger Inflator Module connector for poor connections at both "Pass Side High" (terminal A) and "Pass Side Low" (terminal B) circuit terminals.
6. Checks Passenger Compartment Discriminating Sensor connector for poor connections at "Driver Side Low" (terminal D) circuit terminal.
7. Checks Dual Pole Arming Sensor for low resistance. Also checks for an intermittent short between initiator circuits ("Side High" and "Side Low" circuits) and either "36VLR" or "Source Sense" circuits.