Testing the Serial Data Circuits for a Short Between The Circuits
WARNING: This page is about a different car, the 2011 Chevrolet Volt. However, it is still accessible from the selected car via links, so may be relevant.
- Connect the harness connectors at the control module that was previously disconnected.
- Ignition OFF, disconnect the harness connectors with the BECM dedicated serial data circuits at another control module that is not communicating, in the direction of the circuits shorted together.
- Ignition OFF and all vehicle systems OFF, all keys at least 3 meters away from vehicle, all access doors closed. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 110 Ω between each pair of BECM dedicated serial data circuits at the control module connector that was just disconnected. Verify that one pair of BECM dedicated serial data circuits are less than 110 Ω.
- If each pair of BECM dedicated serial data circuits is greater than the specified range, replace the control module that was just disconnected.
- Repeat step 1 until one of the following conditions are isolated:
- BECM dedicated serial data circuits shorted together between 2 control modules or splice packs, if equipped
- BECM dedicated serial data circuits shorted together between a control module and a terminating resistor