Chart C3 Warning Lamp Comes On Steady

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? 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 if there is a short to ground on the low side of the lamp circuit external to the DERM. The SIR Load Tool prevents the shorting bar in the DERM connector from grounding the lamp circuit.
2. Checks for "IGNITION 1" voltage at the DERM. When the "IGNITION 1" circuits are open the DERM grounds the warning lamp circuit whenever the Ignition Switch is "ON" (if the "SIR Indicator High" circuit is good).
3. Checks if there is a short between circuit 236 and 358. When these two circuits are shorted together the warning lamp flickers but never fully turns off.