B0018

When measurements are requested in this chart, use SA9114NE digital multimeter with correct terminal adapter from SA9206Z. When a check for proper connection is requested, refer to "Intermittent and Poor Connections." When a wire connector or terminal repair is requested, use the proper repair parts and refer to "Wire Repair" procedure.


CAUTION: BE CAREFUL WHEN YOU HANDLE A SENSING AND DIAGNOSTIC MODULE (SDM). DO NOT STRIKE OR JOLT THE SDM. BEFORE APPLYING POWER TO THE SDM:
^ REMOVE ANY DIRT, GREASE, ETC. FROM THE MOUNTING SURFACE.
^ POSITION THE SDM HORIZONTALLY ON THE MOUNTING SURFACE.
^ POINT THE ARROW ON THE SDM TOWARD THE FRONT OF THE VEHICLE.
^ TIGHTEN ALL OF THE SDM FASTENERS AND SDM BRACKET FASTENERS TO THE SPECIFIED TORQUE VALUE.

FAILURE TO FOLLOW THE CORRECT PROCEDURES COULD CAUSE AIR BAG DEPLOYMENT, PERSONAL INJURY OR UNNECESSARY SIR SYSTEM REPAIRS.

CIRCUIT DESCRIPTION
When the ignition switch is turned On and during vehicle operation, the Sensing and Diagnostic Module (SDM) performs tests to detect system faults. One test the SDM performs is to monitor the passenger side high circuit and passenger side low circuit voltage difference. By monitoring voltage, the SDM is able to detect when loop voltage is not between 2.4 and 6.0 volts.

DTC TEST CONDITIONS
DTC E0018 can be set when the passenger loop voltage is out of range. The following conditions must be met to set this DTC.
^ Ignition voltage is present at the SDM and continuous.
^ The passenger deployment loop voltage is over 6 volts or under 2.4 volts and loop resistance is under 6ohms.
^ Fault needs to 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.
^ Passenger loop resistance test will be disabled.

DIAGNOSTIC AIDS
When attempting to diagnose an intermittent passenger loop fault, use the scan tool to monitor current DTCs. Wiggle wires 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.

A short to ground in circuits 1403 or 1404 could cause this DTC.

A short between circuits 1403 or 1404 and another vehicle circuit 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 "Intermittent 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 he a current or history code.