Circuit/System Testing
WARNING: This page is about a different car, the 2008 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
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.
- Verify that the latest service software is installed.
- Disconnect harness connector X2 from the SGCM. Refer to Generator Control Module Replacement .
- Using the appropriate test adapters, test for 5-100 ohms resistance between terminals 9 and 12.
- If within the specified range, replace the SGCM.
- Disconnect the 7 pin X1 connector at the MGU. Refer to Generator with Starter Replacement .
- Test for less than 1 ohm between SGCM connector harness terminal 12 and the MGU X1 connector harness terminal A.
- If greater than the specified value, repair the open circuit.
- Test for less than 1 ohm between SGCM connector harness terminal 9 and the MGU X1 connector harness terminal C.
- If greater than the specified value, repair the open circuit.
- If both circuits test normal, replace the MGU.