DTC 26

Wiring Diagram:

CIRCUIT DESCRIPTION

When the ignition switch is turned to "ON," the SDM will perform tests to diagnose critical malfunctions within itself. Upon passing these tests Ignition 1," 23 VLR, and deployment loop voltages are measured to ensure they are within their respective normal voltage ranges. During "Deployment Loop Continuity" and "Continuous Monitoring" diagnostics, a fixed amount of current is flowing in the deployment loop. This produces proportional voltage drops in the loop. By monitoring the voltage difference between "Driver Side High" and "Driver Side Low" the SDM calculates the combined resistance of the driver inflator module, SIR coil assembly, harness wiring CKTs G/R and G and connector terminal contact.

DTC WILL SET WHEN

The voltage difference between "Driver Side High" terminal "9" and "Driver Side Low" terminal "10" is above or equal to a specified value for 500 milliseconds during "Deployment Loop Continuity" or "Continuous Monitoring."

ACTION TAKEN

SDM turns "ON" the "AIR BAG" warning lamp and sets a diagnostic trouble code.

DTC WILL CLEAR WHEN

The voltage difference between "Driver Side High" terminal "9" and "Driver Side Low" terminal "10" is below a specified value for 500 milliseconds during "Continuous Monitoring."

DTC CHART TEST DESCRIPTION

Numbers below refer to circled numbers on the diagnostic chart.

1. This test verifies proper connection of the yellow 2-way connector at the base of the steering column.

2. This test checks for proper contact and/or corrosion of the yellow 2-way connector at the base of the steering column.

3. This test isolates the malfunction to one side of the driver inflator module yellow 2-way connector located at the base of the steering column.

4. This test determines whether the malfunction is due to an open in the wiring.

5. This test determines whether the malfunction is in the SIR coil assembly or the driver inflator module.

DIAGNOSTIC AIDS

An intermittent condition is likely to be caused by a poor connection inside the SIR coil assembly, at the driver inflator module terminals "D1" or "D2," at the top of the steering column, at SIR coil assembly terminals "D3" or "D4," SDM terminals "9" or "10," or an open in CKT G/R or CKT G. To test for a bad SIR coil assembly, clear any DTCs, then turn the steering wheel back and forth with the ignition switch turned to "ON." If the "AIR BAG" warning lamp comes "ON" and DTC 26 has reset, it is likely the SIR coil is faulty.