2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 626
DTC B3121 05
- Keyless Entry Antenna 3 High Voltage/Open
Diagnostic Fault Information
Circuit/System Description
The rear fascia antenna is located in the rear fascia assembly and is used to establish low frequency communications with the keyless entry
transmitter. As a vehicle with locked doors is approached with a keyless entry transmitter and the exterior rear closure touch pad is pressed, the
keyless entry control module communicates with the rear fascia keyless entry antenna.
Conditions for Running the DTC
* The rear closure touch pad is pressed.
* The scan tool activates a device control function to simulate the above action.
Conditions for Setting the DTC
B3121 02
The keyless entry control module detects a short to ground on the rear fascia keyless entry antenna signal circuit.
B3121 05
The keyless entry control module detects a short to B+ or an open on the rear fascia keyless entry antenna signal circuit.
Action Taken When the DTC Sets
Rear closure will not open when rear closure touch pad is pressed.
Conditions for Clearing the DTC
* A current DTC will clear when the conditions for setting the DTC are no longer present.
* A history DTC will clear after 40 malfunction-free ignition cycles.
Reference Information
Schematic Reference
Remote Function Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Keyless Entry/Keyless Entry
Transmitter/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Keyless Entry System Description and Operation (without ATH) (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Keyless
Entry/Description and Operation/Keyless Entry System (without ATH))Keyless Entry System Description and Operation (with ATH) (See:
Accessories and Optional Equipment/Antitheft and Alarm Systems/Keyless Entry/Description and Operation/Keyless Entry System (with ATH))
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
