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.
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HOMESERVICE MANUALSCHEVROLET2014TRAVERSE LT, 4D UTILITYREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMDATA COMMUNICATION SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DOES NOT COMMUNICATE WITH HIGH SPEED GMLAN DEVICECIRCUIT/SYSTEM TESTINGNOTES
2014 Chevrolet Traverse LT, 4D Utility
Circuit/System Testing: Notes
2014 Chevrolet Traverse LT, 4D UtilitySECTION Notes
NOTE:
Each control module may need to be disconnected to isolate a circuit fault. Use the schematic and component connector end views to identify the following:
- Control modules the vehicle is equipped with
- High speed GMLAN serial data circuit terminating resistors
- Control module locations on the high speed GMLAN serial data circuits
- Each control module's high speed GMLAN serial data circuit terminals
- Attempt to communicate with all control modules on the high speed GMLAN serial data circuit, refer to Data Link References . Communications should not be available with two or more control modules on the high speed GMLAN serial data circuit.
- If only one control module is not communicating, diagnose that control module only; refer to DTC U0100-U02FF .
- 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 Ω 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 circuits listed below and ground:
- Terminal 6
- Terminal 14
- 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 Voltage .
- Ignition OFF for 60 seconds, test for greater than 100 Ω between the serial data circuits listed below and ground:
- Terminal 6
- Terminal 14
- 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 Ground .
- Test for 50-70 Ω between the serial data circuits terminal 6 and terminal 14.
- If less than 35 Ω, test for a short between the serial data circuits; refer to Testing the Serial Data Circuits for a Short between the Circuits .
- If 35-50 Ω there may be a third terminating resistor between the serial data circuits. This can happen if the incorrect control module is installed. Some control modules are available with and without the terminating resistors installed to reduce the need of terminating resistors in the wiring harness.
- If greater than 70 Ω but less than infinite, test the serial data circuit for an open/high resistance; refer to Testing the Serial Data Circuits for an Open/High Resistance .
- If infinite, test the serial data circuits between the DLC and the first connection to the serial data circuit for an open/high resistance.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.