For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | 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 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

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Charging System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Refer to Battery Electrical Drain/Parasitic Load Test.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.