B0026

CIRCUIT DESCRIPTION
When the ignition switch is turned On and during vehicle operation, the Sensing and Diagnostic Module (SDM) performs test to detect system faults. One test the SDM performs is to monitor the driver side high circuit and driver side low circuit voltage difference. By monitoring voltage difference, the SDM is able to calculate the driver loop resistance. High resistance indicates an open somewhere in the driver deployment loop.

DTC TEST CONDITIONS
DTC B0026 can be set when the driver loop resistance is high. The following conditions must be met to set this DTC:
^ Ignition voltage is present at the SDM and continuous.
^ The driver deployment loop resistance is over 4.8 ohms or circuit 347 under 2 volts and loop resistance over 6 ohms.
^ Fault needs to only be present for less than half a second or five consecutive sample readings.

ACTION TAKEN
^ When this fault is detected a current DTC will be set.
^ The air bag light will be turned On.

DIAGNOSTIC AIDS
When attempting to diagnose an intermittent driver loop fault, use the scan tool to monitor current DTCs. Wiggle wires, turn steering wheel, and check connections while watching for a current DTC to appear and/or disappear on Scan tool.

Always start diagnosis of SIR DTCs with an inspection of wiring and components for visible damage.

An open in circuits 347 or 348 to the driver inflator module could cause this DTC.

Always perform the "SIR Diagnostic System Check" procedure before using this chart. Diagnostic System Check

When measurements are requested in this chart, use SA 91114NE digital multimeter with correct terminal adapter from SA 9206Z. When a check for proper connection is requested, refer to "Intermittents and Poor Connections." When a wire connector or terminal repair is requested, use the proper repair parts and refer to "Wiring Repair."

NOTICE: Perform "SIR DIAGNOSTIC SYSTEM CHECK" before proceeding with this chart.

NOTE: Air bag telltale will remain On after the same DTC appears twice and is stored in memory as a history code. If the air bag telltale is On, the DTC can be a current or history code