As posted by GM-TECH in another thread. Hope this helps.
Supplemental Inflatable Restraint (SIR) Light ON, DTCs B0026 and/or B0044 (Inspect and/or Replace IP Harness to Inflatable Restraint Steering Wheel Module Yellow 4-Way Connector C221) #05-09-41-001 - (Jan 19, 2005)
2003-2005 Cadillac Escalade Models
2003-2005 Chevrolet Full Size Pickup and Utility Models
2003-2005 Chevrolet Avalanche
2003-2005 GMC Full Size Pickup and Utility Models
Condition
Some customers may comment that the Service Air Bag Light is on.
Diagnosis with a scan tool may indicate a DTC B0026 and/or B0044 is set.
Cause
The most likely cause of a DTC B0026 and/or B0044 is improper connection/high resistance in the IP harness to inflatable restraint steering wheel module connector C221, located behind the driver's side hinge pillar panel.
Diagnostic Information
DTC B0026-stage 1 or B0044-stage 2 will set when one of the following conditions occur:
? The SDM detects the steering wheel module deployment loop resistance is greater than 4.8 ohms for 500 milliseconds.
? The SDM detects that the voltage at steering wheel module high control is less than 2.4 volts and steering wheel module deployment loop resistance is 6 ohms or greater for 500 milliseconds.
? For additional diagnostic information, refer to DTC B0022, B0024, B0026, B0042, B0043, or B0044 (SI Document ID #847376).
Correction
DO THIS
Don't Do This
Test for proper connection/high resistance at connector C221.
DO NOT replace SIR system components prior to testing for proper connection/high resistance in C221 for DTCs B0026 and/or B0044
Caution: When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Refer to SIR Disabling and Enabling Zones. Failure to observe the correct procedure could cause deployment of the SIR components, personal injury, or unnecessary SIR system repairs.
Important: The IP harness to inflatable restraint steering wheel module connector C221 is NOT located at the base of the steering column. The IP harness to inflatable restraint steering wheel module yellow 4-way connector C221 is located behind the driver's side hinge pillar panel.
Remove the drivers side door sill plate.
Remove the driver's side hinge pillar panel.
Locate the IP harness to inflatable restraint steering wheel module yellow 4-way connector C221.
Inspect the IP harness to inflatable restraint steering wheel module connector C221 for proper connection.
Disconnect and reconnect the IP harness to inflatable restraint steering wheel module connector C221 THREE times.
Clear the DTC and road test the vehicle.
- If DTCs B0026 and/or B0044 DO NOT reset, no additional repairs are necessary. Continue with step 10.
- If DTCs B0026 and/or B0044 DO reset, the most likely cause is high resistance in the IP harness to inflatable restraint steering wheel module connector C221. Continue with the next step.
Replace the IP harness to inflatable restraint steering wheel module connector C221, P/N's 15306186 and 15306363. Refer to SIR/SRS Wiring Repairs (SI Document ID #325229).
Road test the vehicle and confirm that the repair is complete.
- If DTCs B0026 and/or B0044 DO reset, refer to DTC B0022, B0024, B0026, B0042, B0043, or B0044 (SI Document ID #847376).
- If DTCs B0026 and/or B0044 DO NOT reset, no additional repairs are necessary. Continue with the next step.
Install the driver's side hinge pillar panel.
Install the driver's side door sill plate.
Parts Information
Part Number
Description
Qty
15306186
Connector (4-way Female, w/Leads)
1
15306363
Connector (4-way Male, w/Leads)
1
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
N6624
Wiring And/Or Connector - Occupant Safety - Repair Or Replace
Use published labor operation time
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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