Chart 1 Inflatable Restraint Indicator Comes on Steady

Wiring Diagram:

***This procedure is updated by TSB 43-90-20, October, 1994***

CIRCUIT DESCRIPTION

When the Ignition Switch is first turned 'ON', system voltage is applied through fuse A3 to the 'Redundant Indicator Ignition 1' terminal 'B2', and the 'INFLATABLE RESTRAINT' indicator which is connected to 'SIR Indicator' control terminal 'B1'. Fuse A11 also applies system voltage to the Ignition 1 terminal A9' and A10'. The DERM responds by flashing the 'INFLATABLE RESTRAINT' indicator 7 times.

When the engine is being cranked, system voltage is applied to the DERM at the 'CRANK' terminal 'B10'. The DERM grounds the lamp circuit until system voltage is removed from the 'CRANK' terminal 'B10'. This results in a steady 'INFLATABLE RESTRAINT' indicator during cranking.

After cranking, the DERM will flash the 'INFLATABLE RESTRAINT' indicator 6 times.

NOTES ON FAULT TREE

1. An open fuse All would cause the 'INFLATABLE RESTRAINT' indicator to come on steady.

2. A disconnected DERM harness connector will cause the 'INFLATABLE RESTRAINT' indicator to come on steady via the shorting bar from terminal A1' to terminal 'B1'.

3. Checking for an open in the Ignition 1 circuitry to the DERM.

4. Checking for CKT 358 shorted to ground.

5. Checking CKT 806 for a short to voltage.

6. Checking if a short to ground caused fuse All to open.

7. Checking whether the short to ground is due to a faulty Dual Pole Arming Sensor or a short in the wiring.