Testing the Serial Data Circuits for a Short to Ground
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 minutes for all vehicle systems to power down.
- Disconnect the harness connectors with the chassis high speed GMLAN serial data circuits at an easily accessible device.
- Test for greater than 100 Ω between each serial data circuit at the device connector that was just disconnected and ground.
- If each serial data circuit is 100 Ω or greater
Replace the device that was disconnected.
- If any serial data circuit is less than 100 Ω
- If each serial data circuit is 100 Ω or greater
- Disconnect the harness connectors with the chassis high speed GMLAN serial data circuits at another device, in the direction of the circuit shorted to ground.
- Test for greater than 100 Ω between each serial data circuit at the device connector that was just disconnected and ground.
- If both serial data circuits are 100 Ω or greater
Replace the device that was disconnected.
- If any serial data circuit is less than 100 Ω
- If both serial data circuits are 100 Ω or greater
- Repeat step 4 until one of the following conditions are isolated:
- A short to ground on the serial data circuit between two devices or splice packs, if equipped.
- A short to ground on the serial data circuit between a device and a terminating resistor.
- A short to ground on the serial data circuit between the X84 Data Link Connector and the first device or splice pack.