Chart A3 History Code Diagnosis

Diagnosis Chart:

Electrical Chart:

DESCRIPTION:
When the Ignition Switch is first turned "ON" system voltage is applied through Fuse #6 to the "SIR Indicator High" input (B9) and the "INFLATABLE RESTRAINT" warning lamp which is connected to "SIR Indicator Low" input (A1). Fuse #7 also applies system voltage to the "IGNITION 1" inputs (A3 and B3). The DERM responds by blinking the "INFLATABLE RESTRAINT" 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 warning lamp circuit until system voltage is removed from the "CRANK" input. This results in a steady "INFLATABLE RESTRAINT" warning lamp during cranking.

After cranking, the DERM again blinks the "INFLATABLE RESTRAINT" warning lamp 7 to 9 times.

NOTES ON FAULT TREE
1. Checks for intermittent shown between 36VLR wiring (circuit 236) and circuits 347, 348 or 349 of the SIR wiring harness.
2. Checks for intermittent open in 36YLR wiring (circuit 236).
3. Checks for intermittent open between "AIRBAG" Fuse #7 and Arming Sensor (circuit 1139).