2010 Cadillac CTS Sedan AWD V6-3.6L Page 145

2010 Cadillac CTS Sedan AWD V6-3.6L Page 145

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

SIR System Description and Operation (See: Restraints and Safety Systems/Air Bag Systems/Description and Operation/SIR System Description

and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the appropriate scan tool Seat Belt Switch parameter while buckling and unbuckling the seat belt. The parameter should

change between Buckled and Unbuckled.

Circuit/System Testing

Important: When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or

replacement of the appropriate component/connector:

* The SDM

* The SDM wiring harness connector

* The seat belt buckle

* The seat belt buckle wiring harness connector

1. Ignition OFF, disconnect the harness connector of the seat belt switch.

2. Ignition OFF, test for less than 10 ohms between the low reference circuit terminal A and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the SDM.

3. Ignition ON, verify the appropriate scan tool Seat Belt Switch parameter is Unbuckled.

瀚慖f not the specified value, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the SDM.

4. Install a 3A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the appropriate scan tool

Seat Belt Switch parameter is Buckled.

瀚慖f not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the

SDM.

5. If all circuits test normal, test or replace the seat belt buckle assembly.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Driver or Passenger Seat Belt Buckle Replacement (See: Restraints and Safety Systems/Seat Belt Systems/Seat Belt Buckle/Service and

Repair/Driver or Passenger Seat Belt Buckle Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for SDM replacement, setup, and programming

B0073

DTC B0072 or B0073

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.