2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 470
Circuit/System Description
The body control module (BCM) monitors the state of charge (SOC) of the 12V electrical system. If the BCM senses that the 12V current draw was
greater than 2 amps and the SOC at key-on is 30 percent lower than it was when the engine was last running, DTC B1527 00 will set.
Conditions for Running the DTC
The ignition is turned from Off to Accessory or Run.
Conditions for Setting the DTC
* The SOC at key-on is 30 percent lower than when the engine was last running.
* The 12V battery drain is greater than 2 amps.
Action Taken When the DTC Sets
No actions are taken. This DTC sets as an aid to the technician.
Conditions for Clearing the DTC
* The DTC will clear when the SOC is greater than or equal to 80 percent.
* A history DTC clears after 50 consecutive ignition cycles that the diagnostic runs and does not fail.
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/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
Circuit/System Verification
Ignition ON, compare the scan tool BCM 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 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.
B1529
DTC B1529
Diagnostic Instructions
* 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.
