Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

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.

NOTE: 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

Scan and record the hybrid battery voltage parameters for modules 1, 2, and 3.
Measure the module voltages 1, 2, and 3, DTC and compare it to the parameter scanned values in step 1. Refer to Hybrid Battery Service Disconnect/Connect .
- If the module with the DTC has greater than 1 volt measured difference from the other 2 modules, replace the battery pack.
Disconnect harness connector X1 from the BECM.
Test for 1.3-1.7k ohms between the following circuits:
- X1 terminal 1 to Generator Battery 1-X1
- X1 terminal 11 to Generator Battery 1-X2
- X1 terminal 2 to Generator Battery 2-X2
- X1 terminal 12 to Generator Battery 3-X2
- If not within specified range, replace the voltage sensor harness assembly.
If all circuits test normal, replace the BECM.