B1527

DTC B1527

Diagnostic Instructions

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

DTC Descriptor
DTC B1527 00
- High Parasitic Load Detected

Circuit/System Description

The body control module (BCM) monitors the state of charge (SOC) and current draw of the battery, in order to determine if there is a high parasitic load.

Conditions for Running the DTC

All of the following conditions are present:

* The battery current was less than -2 A for 15 seconds while the ignition was OFF, no key fob buttons were pressed, and no doors were open.
* The ignition is turned from OFF to ON.

Conditions for Setting the DTC

When the ignition is turned ON, the SOC is 30 percent less than it was when the engine was last running.

Action Taken When the DTC Sets

No indicators or DIC messages are displayed. This DTC is for information only.

Conditions for Clearing the DTC

* The DTC will pass when the SOC is 80 percent for 15 seconds.
* A history DTC will clear if the fault does not return for 50 consecutive ignition cycles.

Reference Information
Schematic Reference

Starting and Charging Schematics (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 (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Programming and Relearning (Programming and Relearning) for scan tool information

Circuit/System Verification

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

Repair Instructions

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