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

If other DTCs are set diagnose those first.
If the DTC is still set as current and the contactor status is closed.
Scan and record the total pack and module voltages.
Remove the generator battery disconnect control module cover. Refer to Hybrid Battery Service Disconnect/Connect .
Measure the 1, 2, 3 module voltages and then the total pack voltage.
- If any measured voltages differ than 0.5 volt than the scanned voltage, test the voltage sensing harness for a short to ground or an open/high resistance.
Disconnect BECM connector X1.
Test for 1400-1800 ohms between the following circuits.
- X1 terminal 12 and Generator Battery 3-X2
- X1 terminal 2 and Generator Battery 2-X2
- X1 terminal 11 and Generator Battery 1-X2
- X1 terminal 1 and Generator Battery 1-X1
- If not within specified range, replace the voltage sensing harness assembly.
If all circuits tests normal, replace BECM.