DTC 26

Electrical Diagram:

CIRCUIT DESCRIPTION
If there is an open in the SIR coil, inflator module or wiring in the steering column the resistance between the "Sense High" input, terminal "A7" and the "Sense Low" input, terminal "A6," increases. This increased resistance causes a larger voltage drop from the "Sense High" input to the "Sense Low" input, across the 430 ohm resistor in the resistor module. The increase in the voltage difference between the "Sense High" input and the "Sense Low" input is noted by the DERM during the "Continuous Monitoring" tests and Code 26 is set.

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

FAILURE CONDITION(S)
Code 26 will set if the voltage at the "Sense High" input, terminal "A7," minus the voltage at the "Sense Low" input, terminal A6," is greater than 0.45 volt for 500 milliseconds.

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

CONDITIONS TO CLEAR
Code 26 will clear if the voltage at the "Sense High" input, terminal "A7," minus the voltage at the "Sense Low" input, terminal "A6," is greater than 0 volts but less than 0.40 volt for 500 milliseconds after Code 26 has been set.

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test determines whether the fault is in lower column connectors or associated wiring.
2. This test determines whether the fault is in upper column connectors or associated wiring.
3. This test determines whether the fault is in the inflator module.
4. This test determines whether the fault is in the SIR coil.
5. This test checks for a short from the "36VLR" circuit to the "Sense High" circuit.
6. This test checks the integrity of the 2490 ohm "Sense Low" resistor and associated circuitry in the resistor module.
7. This test checks for poor connections which may set the code.