2010 Cadillac Truck SRX AWD V6-3.0L Page 466
B1451 04
Accessory output is not active and an open circuit is detected 20 consecutive times.
Action Taken When the DTC Sets
B1451 02
The accessory output is deactivated when a short to ground is detected. After 100 ms the output is activated again. This happens 3 times and then
the output is deactivated until a new accessory request is received.
B1451 01, B1451 04
No action is taken.
Conditions for Clearing the DTC
* The current DTC will clear when the malfunction is no longer present during a DTC check.
* A history DTC clears after 40 malfunction-free ignition cycles.
Diagnostic Aids
* A short to voltage on the accessory wake-up serial data circuit will keep the vehicle serial data bus awake, which can drain the vehicle's
battery.
* If DTC B1451 02 is set, be sure to test the accessory wake-up serial data circuit for a short to ground between the body control module
(BCM) and each of the modules that receive a signal from the accessory wake-up circuit before replacing the BCM. A short to ground
between the BCM and modules may provide feedback through the BCM to the keyless entry control module and result in the setting of the
DTC.
Reference Information
Schematic Reference
* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)
* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Power Mode Description and Operation (See: Power and Ground Distribution/Description and Operation/Power Mode)
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)
Circuit/System Testing
1. Verify DTC B1330 is not set.
瀚慖f the DTC is set, refer to DTC B1330 (See: B Code Charts/B1330)
2. Ignition OFF, disconnect the X2 harness connector at the K84 keyless entry control module.
3. Verify that a test lamp illuminates between B+ circuit terminal 5 and ground.
瀚慖f the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If the B+ fuse is open, test the B+ circuit for a short to
