• | 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 battery energy control module (BECM) monitors the hybrid system voltage using the internal voltage sensor, this DTC sets when the sensor voltage is not within the calibrated range.
The engine is running.
Pack Voltage raw A/D less than 0.5 volt
Pack Voltage raw A/D greater than 4.5 volts
Hybrid system is inactive.
Pack voltage operates inside the threshold range.
Hybrid Energy Storage Schematics
Generator Battery Carrier Description and Operation
• | Circuit Testing |
• | Wiring Repairs |
Control Module References for scan tool information
J 35616 GM Approved Terminal Test Kit
Caution: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.
Caution: To help avoid personal injury, be careful when working in the vicinity of the generator battery disconnect control module. Internal components will still be live, 36V potential, even when the cover has been opened or removed.
Important: Use the following list to identify the appropriate terminals to test:
• | J-35616-65B for female terminals |
• | J-35616-64B for male terminals |
⇒ | If greater than the specified range, replace the BECM. |
⇒ | If not within the specified range, replace the harness assembly. |
⇒ | If not within the specified range, replace the harness assembly. |
⇒ | If greater than the specified range, replace the BECM. |
⇒ | If not within the specified range, replace the harness assembly. |
⇒ | If not within the specified range, replace the harness assembly. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BECM replacement, setup, and programming |