31 Part 1 of 3

Code 31 Part 1 Of 3:

SIR Wiring Diagram:

DESCRIPTION:

The voltage at the "Sense Low" input, terminal A6, is between 41% and 61% of 36VLR output voltage when 36VLR output of the DERM is functional. Should the circuit open between the 36VLR output and the arming sensor, "Ignition 1" voltage will be supplying the deployment loop. The voltage at the "Sense Low" input terminal A6 will decrease due to the lower supply voltage and Code 31 will set after 700 milliseconds (if Code 42 is not set). Code 31 indicates an open in the wiring between the 36VLR output of the DERM and the arming sensor.

TEST CONDITIONS:

Test every 100 milliseconds during "Continuous Monitoring".

FAILURE CONDITIONS:

Code 31 will set if the voltage at the "Sense Low" input, terminal A6, is between 28% and 59% of "Ignition 1" voltage for 700 milliseconds and Code 42 is not set.

ACTION TAKEN:

DERM turns ON the "INFL REST" warning lamp.

CONDITIONS TO CLEAR:

Current Code 31 will clear if the voltage at the "Sense Low" input, terminal A6, is between 41% and 61% of 36VLR output voltage for 500 milliseconds.

TEST DESCRIPTION: Number(s) below refer to circled number(s) on the diagnostic chart.

1. This test checks for 36VLR at the dual sensor terminal B.

2. This test checks for an improper connection at the dual sensor or a fault in the dual sensor connector.

3. This test checks for 36VLR at the dual sensor terminal C. Since it is known that 36VLR is available at terminal B, the absence of 36VLR at terminal C indicates a faulty sensor or wiring connection. Note that the voltage at C will be 0.7 volt less than the voltage measured at terminal B due to the internal diode B voltage drop.

4. This test checks for an open in CKT 236.