Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2011 Chevrolet VoltFACTORY OEM SERVICE PROCEDURE
Circuit/System Testing: Notes
NOTE:
Use the schematic to identify the following:
- Control modules the vehicle is equipped with
- Control module and splice pack locations on the low speed GMLAN serial data circuit
- The low speed GMLAN serial data circuit terminals for each control module, component, or splice pack
- Attempt to communicate with all control modules on the low speed GMLAN serial data circuit. Refer to Data Link ReferencesΒ . Communications should not be available with two or more control modules on the low speed GMLAN serial data circuit.
- If only one control module is not communicating, diagnose that control module only. Refer to DTC U0100-U02FFΒ .
- If one or more control modules are communicating but not all, refer to Testing the Serial Data Circuit for an Open/High ResistanceΒ .
- Disconnect the scan tool from the DLC. The following tests will be done at the DLC connector.
- All access doors closed, ignition OFF for 60 seconds, test for less than 10 Ξ© between the ground circuit terminal 5 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, test for less than 4.5 V between the serial data circuit terminal 1 and ground.
- If greater than the specified range, test the serial data circuit for a short to voltage. Refer to Testing the Serial Data Circuits for a Short to VoltageΒ .
- Ignition OFF for 60 seconds, test for greater than 100 Ξ© between the serial data circuit terminal 1 and ground.
- If less than the specified range, test the serial data circuit for a short to ground. Refer to Testing the Serial Data Circuits for a Short to GroundΒ .
- Disconnect the harness connector at the first splice pack closest in the circuit to the DLC.
- Test for less than 2 Ξ© between the DLC serial data circuit terminal 1 and the splice pack connector serial data input terminal.
- If greater than the specified range, test the serial data circuit for an open/high resistance. If the circuit tests normal, replace the splice pack.
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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