Circuit/System Testing
WARNING: This page is about a different car, the 2016 Buick LaCrosse. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the starter generator X1 harness connector from the A15 starter generator.
- Ignition ON, test the harness side for less than 12 ohms between the low reference circuit terminal 7 and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K59 starter generator control module.
- Ignition ON, verify the scan tool motor temperature sensor parameter is -40°C (-40°F).
- If more than the specified value, test the motor temperature sensor signal circuit for a short to ground. If the circuit tests normal, replace the K59 starter generator control module.
- Install a 3-amp fused jumper wire between the signal circuit X1 terminal 8 and the low reference circuit X1 terminal 7 at the A15 starter generator. Verify the scan tool motor temperature sensor parameter is greater than 214°C (417°F):
- If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K59 starter generator control module.
NOTE:If a short to voltage is found, test the motor temperature sensor for an open circuit or physical damage.
- Ignition OFF, measure and record the resistance between the sensor signal and low reference terminals. Compare the actual sensor and circuit resistance to the expected sensor resistance. Refer to Temperature Versus Resistance .
- If the resistance is not near the expected value, replace the A15 starter generator.