• | 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 link voltage using 4 voltage sensors and a internal sensor to detect a low or high voltage condition.
The engine is ON.
The internal voltage sensor is less than 0.5 volts.
The generator battery disconnect control module cover is not installed.
The internal voltage sensor is greater than 4.5 volts
Hybrid system is disabled.
Link voltage returns between the calibrated thresholds.
Hybrid Energy Storage Schematics
Hybrid Energy Storage Connector End Views
Starter/Generator Description and Operation
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 no voltage was measured at Main Contactor Relay C1 with service disconnect switch depressed, replace generator battery disconnect control module. |
⇒ | If greater than the specified range, replace the generator battery disconnect control module. |
⇒ | If not within specified range, replace the generator battery disconnect control module. |
⇒ | If not within specified range, replace the harness assembly. |
⇒ | If greater than the specified range, replace the generator battery disconnect control module. |
⇒ | If not within specified range, replace the generator battery disconnect control module. |
⇒ | If not within specified range, replace the harness assembly. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Generator Battery Temperature Sensor Replacement
Control Module References for generator battery disconnect control module replacement, setup, and programming