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 - 12VCircuit/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
Connector End View Reference
Description and Operation
Charging System Description and Operation
Electrical Information Reference
Scan Tool Reference
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 . |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
