Supplemental Inflatable Restraint (SIR)

Code 61:

DERM Circuit Detail:

DESCRIPTION:


The DERM monitors the ground driver output by comparing the output state to the processor commanded state. Code 61 will set when the commanded state does not match the output state of the ground driver. A possible cause for a Code 61 an open or short to ground in the Forced Low circuit.

TEST CONDITION:

Tested every 100 milliseconds during "Continuous Monitoring".

FAILURE CONDITIONS:

Code 61 will set if:
1. Voltage at Sense Low input is greater than 8 volts.
2. Feedback from ground driver (QDM) does not agree with the commanded state for 500 milliseconds.

CONDITIONS TO CLEAR:

Current Code 61 will be cleared each time the Ignition Switch is turned OFF.

ACTION TAKEN:

DERM attempts to turn on the "INFLATABLE RESTRAINT" indicator.

NOTES ON FAULT TREE:

1. Checks for an open 100 ohm resistor in the Resistor Module.

2. Checks for an open between the Resistor Module and the DERM on the Force Low circuit.