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 - 12V

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 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

Control Module References Control Module References 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 Battery Electrical Drain/Parasitic Load Test.

Repair Instructions

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