DTC 24

Electrical Diagram:

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

FAILURE CONDITION(S)
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.
4. This test checks the integrity of the "Ignition 1" feed to the high side of the deployment loop.
5. This test checks for a short from CKT 347 to ground.
6. This test checks the integrity of the discriminating sensors and associated wiring.
7. This test determines if the condition causing a low resistance value is attributed to the FWD sensor or associated wiring.
8. This test determines if the condition causing low resistance is in the FWD sensor or wiring.
9. This test determines if the condition causing a low resistance value is attributed to the LH sensor or associated wiring.
10. This test determines if the condition causing a low resistance value is attributed to the RH sensor or associated wiring.
11. This test determines if the condition causing low resistance is in the LH sensor or wiring.
12. This test checks for a short from CKT 347 to voltage.
13. This test checks for a short from the low side of the deployment loop to voltage.
14. This test determines if the short to voltage is at CKT 348 or CKT 349.
15. This test checks the integrity of the "36VLR" feed to the high side of the deployment loop.
16. This test checks the integrity of the "Sense Low" 2490 ohm resistor and associated circuitry in the resister module.
17. This test checks for an open in the "Sense Low" circuit.
18. This test checks for a short from the "Force Low" circuit to ground.
19. This test checks for a short from sense "Sense High" circuit to the data line.
20. This test checks for a short from the "Sense High" circuit to ground.
21. This test checks for a short from the "Sense Low" circuit to ground.
22. This test checks for a short from the "Force High" circuit to ground.
23. This test checks for a short from the "Force Low" circuit to voltage.
24. This test checks for a short from the "Sense Low" circuit to voltage.
25. This test checks for a short from the "Force High" circuit to voltage.