Circuit/System Testing
WARNING: This page is about a different car, the 2007 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.
- Disconnect harness connector C2 from the SGCM. Refer to Generator Control Module Replacement .
- Using the appropriate test adapters, test for less than 1 ohm resistance between terminals 2 and 14.
- If within the specified range, replace the SGCM.
- Disconnect the 7 pin connector at the MGU. Refer to Generator with Starter Replacement .
- Test for less than 1 ohm between SGCM connector harness terminal 2 and the MGU connector harness terminal G.
- If less than the specified range, repair the open circuit.
- Test for less than 1 ohm between SGCM connector harness terminal 14 and the MGU connector harness terminal F.
- If less than the specified range, repair the open circuit.
- If both circuits test normal, replace the MGU.