• | 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 disconnect control module monitors the three module voltage sensors for low or high voltage condition.
The engine is running.
Module 1 voltage raw A/D is less than 0.5 volts.
Module 1 voltage raw A/D is greater than 4.5 volts.
Module 2 voltage raw A/D is less than 0.5 volts.
Module 2 voltage raw A/D is greater than 4.5 volts.
Module 3 voltage raw A/D is less than 0.5 volts.
Module 3 voltage raw A/D is greater than 4.5 volts.
Hybrid system is inactive.
Module voltage raw A/D returns to normal operating range.
Hybrid Energy Storage Schematics
Hybrid Energy Storage Connector End Views
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: In order to avoid damaging the generator battery disconnect control module C1 and C2 connector terminals, the proper test probes should be used. The proper test probes are as follows:
• | J-35616-65B for female terminals |
• | J-35616-64B for male terminals |
⇒ | If the voltages are within 0.5 volt, replace the hybrid battery pack. |
• | C1 terminal 1 to Generator Battery 1-C1 |
• | C1 terminal 11 to Generator Battery 1-C2 |
• | C1 terminal 2 to Generator Battery 2- C2 |
• | C1 terminal 12 to Generator Battery 3- C2 |
⇒ | If not within specified range, replace the current sensor harness assembly. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for generator battery disconnect control module replacement, setup, and programming |