B1527
DTC B1527Diagnostic Instructions
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure.
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information] provides an overview of each diagnostic category. Diagnostic Procedure Instructions - Vehicle Diagnostic Information
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 key on is 30 percent lower than what it was when the engine was running, DTC B1527 will set.
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 key-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]
Connector End View Reference
[Engine Electrical Connector End Views]
Description and Operation
[Charging System Description and Operation]
Electrical Information Reference
^ [Circuit Testing]
^ [Connector Repairs]
^ [Testing for Intermittent Conditions and Poor Connections]
^ [Wiring Repairs]
Scan Tool Reference
^ [Scan Tool Data List - Engine Electrical]
^ [Scan Tool Data Definitions - Engine Controls - 3.6L (LY7)]
Circuit/System Verification
Ignition ON, compare the scan tool Prev. State of Charge and Start Up State of Charge parameters. The readings should not differ by more than 30%.
^ If the readings differ by more than 30%, refer to [Battery Electrical Drain/Parasitic Load Test].