Testing the Serial Data Circuits for a Short between the Circuits
WARNING: This page is about a different car, the 2015 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, all access doors closed, all vehicle systems OFF and all keys at least 3 m (9.8 ft) away from vehicle. It may take up to 2 min for all vehicle systems to power down.
- Disconnect the harness connectors with the high speed GMLAN serial data circuits at an easily accessible device that is not communicating.
- Test for greater than 110 Ω between each pair of serial data circuits at the device connector that was just disconnected.
- If each pair of serial data circuits is 110 Ω or greater
Replace the device that was disconnected.
- If any pair of serial data circuits is less than 110 Ω
- If each pair of serial data circuits is 110 Ω or greater
- Connect the harness connectors at the device that was disconnected.
- Disconnect the harness connectors with the high speed GMLAN serial data circuits at another device, in the direction of the circuit shorted together.
- Test for greater than 110 Ω between each pair of serial data circuits at the device connector that was just disconnected.
- If each pair of serial data circuits is 110 Ω or greater
Replace the device that was disconnected.
- If any pair of serial data circuits is less than 110 Ω
- If each pair of serial data circuits is 110 Ω or greater
- Repeat step 4 until one of the following conditions are isolated:
- Serial data circuits shorted together between two devices or splice packs, if equipped.
- Serial data circuits shorted together between a device and a terminating resistor.
- Serial data circuits shorted together between the X84 Data Link Connector and the first device or splice pack.
- A shorted terminating resistor.