Testing the Serial Data Circuits for a Short to Ground
WARNING: This page is about a different car, the 2016 Chevrolet Malibu Limited. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition/Vehicle 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 10 min 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 3 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.