Testing the Control Module 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.
- Ignition OFF, 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 10 Ω between the low reference circuit terminal at the control module that was just disconnected and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuits test normal, replace the appropriate control module.
- Ignition ON, test for 4.8-5.2 V between each 5 V reference circuit terminal and ground, at the control module connector that was just disconnected.
- If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate control module.
- If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the appropriate control module.
- Connect the harness connectors at the control module that was just disconnected.
- Repeat step 1 at another control module until a short to voltage, a short to ground, or an open/high resistance is found on the control module circuits.