2010 Cadillac CTS Sedan AWD V6-3.6L Page 147
The SDM detects the seat switch signal circuit or low reference circuit is shorted to ground or is open for 500 milliseconds.
B0072 08, B0073 08
The SDM detects an invalid signal in the seat switch signal circuit.
Action Taken When the DTC Sets
The SDM commands the AIR BAG indicator ON.
Conditions for Clearing the DTC
* The conditions for setting the DTC no longer exists.
* A history DTC will clear once 100 malfunction-free ignition cycles have occurred.
Reference Information
Schematic Reference
Seat Belt Schematics (See: Diagrams/Electrical Diagrams/Seat Belt Systems)
Connector End View Reference
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
