B1527

DTC B1527

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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 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 battery drain is more than 2 amps.

Action Taken When the DTC Sets

The charge indicator is not illuminated.

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.

Circuit/System Verification

Ignition ON, compare the scan tool Prev. State of Charge and Start Up State of Charge parameters, in Body Control Module, Data Display, Charging Info. The readings should not differ by more than 30 percent.

If the readings differ by more than 30 percent, refer to Battery Electrical Drain/Parasitic Load Test. Battery Electrical Drain/Parasitic Load Test

Repair Instructions

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