2010 Cadillac CTS Sedan AWD V6-3.6L Page 402
* 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.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1527
- High Parasitic Load Detected
Circuit/System Description
The body control module (BCM) monitors the state of charge (SOC) of the electrical system. If the BCM senses that the SOC at ignition On is 30
percent lower than what it was when the engine was running.
Conditions for Running the DTC
The ignition must be in Accessory or Run mode for this code to set.
Conditions for Setting the DTC
The SOC at ignition On is 30 percent lower than when the engine was running and battery drain is more than 2 amps.
Action Taken When the DTC Sets
There is no battery telltale illuminated or DIC message displayed.
Conditions for Clearing the DTC
* The DTC will clear if the fault does not return after 50 consecutive ignition cycles.
* The DTC will clear when run SOC is greater than or equal to 80 percent.
Reference Information
Schematic Reference
Starting and Charging Schematics (See: Starting and Charging/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Charging System Description and Operation (See: Starting and Charging/Charging System/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* 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)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, compare the scan tool Prev. State of Charge and Start Up State of Charge parameters. The scan tool readings should not differ by
greater than 30 percent.
If the scan tool readings differ by greater than 30 percent, refer to Battery Electrical Drain/Parasitic Load Test (See: Starting and Charging/Testing
and Inspection/Component Tests and General Diagnostics/Battery Electrical Drain/Parasitic Load Test)
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
