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

### 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

#### 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.