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 PERFORMANCETESTING & DIAGNOSISDATA COMMUNICATION SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC U1500-U15FF: CONTROL MODULECIRCUIT/SYSTEM TESTING
2014 Chevrolet Traverse LT, 4D Utility
Circuit/System Testing
2014 Chevrolet Traverse LT, 4D UtilitySECTION Circuit/System Testing
NOTE:
- Use the schematic to identify the following:
- LIN devices the vehicle are equipped with
- The LIN device's B+, ignition, ground and serial data circuit terminals
- Use the Control Module U-Code list to determine which control module is not communicating with the master control module. Refer to Control Module U Code List .
- A loss of serial data communications DTC does not represent a failure of the master control module that set it.
- Ignition OFF, disconnect the harness connector at a LIN device that is not communicating.
- Test for less than 10 Ω between each ground circuit terminal and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- If equipped, verify that a test lamp illuminates between each B+ circuit terminal and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the control circuits of the LIN device for a short to ground. If the circuits test normal, replace the LIN device.
- If equipped, ignition ON, verify that a test lamp illuminates between each ignition circuit terminal and ground.
- If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the control circuits of the LIN device for a short to ground. If the circuits test normal, replace the LIN device.
- Ignition ON, test for 2-12 V between the LIN serial data circuit and ground.
- If greater than the specified range, test the LIN serial data circuit for a short to voltage. If the circuit tests normal, replace the master control module.
- If less than the specified range, test the LIN serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the master control module.
- If all circuits test normal, replace the LIN device.
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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.