• | 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. |
The generator battery control module (GBCM) monitors its internal battery current sensor for many charging system operations, and also for diagnostic purposes. If reversed polarity of the battery current is sensed, then DTC B151B will set.
• | The engine is not running. |
• | DTC B1516 is not set. |
The GBCM detects positive battery current.
The regulated voltage control (RVC) is disabled.
The GBCM detects correct polarity of the battery current.
DTC B151B may set if a battery charger is used.
Starting and Charging Schematics
Charging System Description and Operation
Control Module References for scan tool information
⇒ | If the GBCM is installed backwards or incorrectly, remove and reinstall the GBCM. |
⇒ | If the DTC sets, replace the GBCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for GBCM replacement, setup, and programming.