Part 1 of 6

Code 24 Part 1 Of 6:

SIR Wiring Diagram:

DESCRIPTION:


Code 24 is set when the voltage at the "Sense Low" input, terminal A6, is between 0% and 41% of 36VLR output voltage for 500 milliseconds during the "Continuous Monitoring" tests performed by the DERM. The "Continuous Monitoring" tests are performed by the DERM after the initial "Turn ON" tests are completed and are performed every 100 milliseconds while "Ignition 1" voltage is present at the DERM. The "Continuous Monitoring" tests check the continuity of the deployment loop from the 36VLR output of the DERM through the arming sensor, inflator module, and the discriminating sensors to ground. Code 24 will set if the arming sensor resistance is too high or open, the discriminating sensor resistance is too low or shorted, the "Force High", "Sense Low", or "Force Low" circuits are shorted to ground or system voltage, or the "Sense High" circuit is shorted to ground.


TEST CONDITIONS:


Tested every 100 milliseconds during "Continuous Monitoring".

FAILURE CONDITIONS:

Code 24 will set if the voltage at the "Sense Low" input, terminal A6, is between 0% and 41% of 36VLR output voltage for 500 milliseconds.

ACTION TAKEN:

DERM turns "ON" the "INFL REST" warning lamp.

CONDITIONS TO CLEAR:

Current Code 24 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 determines whether the fault is in the inflator module.

2. This test determines whether the fault is in the SIR coil.

3. This test determines whether the fault is in the sensors or associated wiring. If voltage at "Sense Low" is less than 41% of voltage at 36VLR then the fault is isolated to the deployment loop components and wiring.