DTC 26

DTC 26 Driver Deployment Loop Open




Circuit Description:
When the ignition switch is turned "ON", the Sensing and Diagnostic Module (SDM) will perform tests to diagnose critical malfunctions within itself. Upon passing these tests, "ignition 1", and deployment loop voltages are measured to ensure they are within their respective normal voltage ranges.
During "Continuous Monitoring" diagnostics, a fixed amount of current is following in the deployment loop. This produces proportional voltage drops in the loop. By monitoring the voltage difference between "Driver Bag High" and "Driver Bag Low", the SDM calculates the combined resistance of the driver air bag assembly, SRS coil assembly, harness wiring Circuits(CKTs) IB05-YELLOW and IB06-YELLOW/BLACK, and connector terminal contact.

DTC Will Set When:
The voltage difference between "Driver Bag High" terminal "3" and "Driver Bag Low" terminal "4" is above or equal to a specified value for 500 milliseconds during "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 Bag High" terminal "3" and "Driver Bag Low" terminal "4" is below a specified value for 500 milliseconds during "Continuous Monitoring."

DTC 26 (Steps 1 - 3):

DTC 26 (Steps 4 - 8):

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart:

1. This test determines whether the malfunction is in the Sensing and Diagnostic Module (SDM).
2. This test verifies proper connection of the yellow 2-pin connector at the base of the steering column.
3. This test checks for proper contact and/or corrosion of the yellow 2-pin connector at the base of the steering column.
4. This test isolates the malfunction to one side of the Supplemental Restraint System (SRS) coil assembly yellow 2-pin connector located at the base of steering column.
5. This test determines whether the open is in the wiring.
6. This test determines whether the malfunction is in the SRS coil assembly or the driver air bag assembly.

Diagnostic Aids:
An intermittent condition is likely to be caused by a poor connection at the driver air bag assembly harness 2-pin connector terminals "1" and "2" at the top of the steering column, SRS coil assembly harness 2-pin connection terminals "1" and "2", SDM terminals "3" and "4", or an open in Circuits(CKTs) IBO5-YELLOW and IB06-YELLOW/BLACK.