• | 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 battery pack temperature sensors to detect the failure of any sensor during a rationality check.
Ignition ON
Module temperature 1, 2, 3, 4, 5, or 6 - module temperature average is greater than battery rationality threshold. Where battery rationality threshold equals as follows:
In: Tpack | Out: Temperature Threshold |
---|---|
-40 | 8 |
-30 | 8 |
-20 | 8 |
-10 | 8 |
0 | 8 |
10 | 8 |
20 | 8 |
30 | 8 |
40 | 8 |
50 | 8 |
60 | 8 |
Does not affect hybrid system operation.
Battery module temperature sensors are less than 8°C (46.4°F) different from the average of all temperatures.
Hybrid Energy Storage Schematics
Generator Battery Carrier Description and Operation
Control Module References for scan tool information
J 35616 GM Approved Terminal Test Kit
Warning: 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.
Warning: 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.
Important: Use the following list to identify the appropriate terminals to test:
• | J-35616-65B for female terminals |
• | J-35616-64B for male terminals |
Battery 1 temperature sensor terminals 3 and 4
Battery 2 temperature sensor terminals 5 and 6
Battery 3 temperature sensor terminals 7 and 8
Battery 4 temperature sensor terminals 13 and 14
Battery 5 temperature sensor terminals 15 and 16
Battery 6 temperature sensor terminals 17 and 18
Important: In order to avoid damaging BECM X1 and X2 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 |
Important: The following test must be performed when the battery pack has equalized at room temperature. An increase or decrease in temperature will cause resistance to change and may result in invalid test results.
⇒ | If not within the specified range, test or replace the applicable temperature sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BECM replacement, setup, and programming |