B1527

DTC B1527

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptor
DTC B1527 00
- High Parasitic Load

Circuit/System Description

The body control module (BCM) monitors the state of charge (SOC) of the electrical system. If the BCM senses that the battery current was less than -2 amps and the SOC at key-on is 30 percent less 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 ON.

Conditions for Setting the DTC

* The SOC at key-on is 30 percent less than it was when the engine was last running.
* The average battery current was less than -2 amps when the ignition was OFF.

Action Taken When the DTC Sets

No actions are taken.

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 ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Charging System Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Refer to Battery Electrical Drain/Parasitic Load Test (Battery Electrical Drain/Parasitic Load Test).

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.