Supplemental Inflatable Restraint (SIR)

Electrical Diagram:

CIRCUIT 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 either ground driver at terminal "A1" or terminal "A10." A possible cause for a Code 61 is an open in the "Force Low" circuit or open in the "INFL REST" lamp circuit..

TEST CONDITION(S)
Tested every 100 milliseconds during "Continuous Monitoring".

FAILURE CONDITION(S)
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.

ACTION TAKEN
DERM attempts to turn "ON" the "INFL REST" warning lamp.

CONDITIONS TO CLEAR
Current Code 61 will be cleared each time the ignition switch is turned "OFF".

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks for proper resistance of the 100 ohm resistor in the resistor module.
2. This test checks for an open in the "Force Low" circuit.
3. All faults with the internal cluster wiring and indicator bulbs are diagnosed in charts B and C. Failure to carefully follow the "SIR Diagnostic System Check" may result in misdiagnosis and unnecessary replacement of a functional DERM.