DTC 25

DTC 25 Driver Deployment Loop Short To Voltage




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
The SDM monitors the voltage at "Driver Bag Low" terminal "4" and "Passenger Bag Low" terminal "16" to detect shorts to B+ in the air bag assembly circuits.

DTC Will Set When:
"Ignition 1" is in the normal operating voltage range. This test is run once each ignition cycle and "Continuous Monitoring". Once these conditions are met and the voltage at "Driver Bag Low" is above a specified value, Diagnostic Trouble Code (DTC) 25 will set.

Action Taken:
SDM turns "ON" the "AIR BAG" warning lamp and sets DTC 25 and also DTC 71

DTC Will Clear When:
The SDM is replaced.

DTC 25 (Steps 1 And 2):

DTC 25 (Steps 3 - 8):

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

2. This test determines whether the SDM is malfunctioning.
3. This test isolates the malfunction to one side of the Supplemental Restraint System coil assembly yellow 2-pin connector at the base of steering column.
4. This test determines whether the malfunction is in Circuit(CKT) IB05-YELLOW.
5. This test determines whether the malfunction is in CKT IB06-YELLOW/BLACK.
6. This test determines whether the malfunction is in the Supplemental Restraint System (SRS) coil assembly or the driver air bag assembly.

Diagnostic Aids:
An intermittent condition is likely to be caused by a short to B+ in the driver air bag assembly circuit. Inspect CKTs IB05-YELLOW and IB06-YELLOW/BLACK carefully for cutting or chafing. It the wiring pigtail of the driver air bag assembly and SRS coil assembly is damaged, the components must be replaced. A careful inspection of CKT IBO5-YELLOW and IB06-YELLOW/BLACK, including the SRS coil assembly and driver air bag assembly is essential to ensure that the replacement Sensing and Diagnostic Module (SDM) will not be damaged.

DTC 25 Driver Deployment Loop Short To Ignition

CAUTION: When Diagnostic Trouble Code (DTC) 25 has been set, it is necessary to replace the Sensing and Diagnostic Module (SDM). Setting DTC 25 will also cause DTC 71 to set. When a scan tool "CLEAR CODES" command is issued and the malfunction is no longer present, DTC 71 will remain current. Ensure that the short to voltage condition is repaired prior to installing a replacement SDM to avoid damaging the SDM.