Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit/System Testing
- Control modules the vehicle is equipped with
- The control modules ground, B+, and ignition circuit terminal IDs and connectors
- Ignition OFF, disconnect the harness connectors at the K59 starter generator control module.
- Ignition OFF, scan tool disconnected, open and close the driver door and wait 1 minute. Test for less than 10 Ξ© between each ground circuit terminal at the K59 starter generator control module harness and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Test for 10-18V between each B+ circuit terminal at the K59 starter generator control module harness and ground.
- If less than the specified range, test the B+ circuit for a short to ground or an open/high resistance.
- Ignition ON, test for 10-18 V between each ignition circuit terminal and ground.
- If less than the specified range, test the ignition circuit for a short to ground or an open/high resistance.
- If all circuits test normal, replace the K59 starter generator control module.
Use the schematic to identify the following:
Some control module ground circuits may require up to 20 minutes to achieve a resistance reading of less than 10 Ξ©. In most cases the readings will drop below 20 Ξ© within 1 minute indicating the control modules are going to sleep.
If less than the specified range, test the B+ circuit for a short to ground or an open/high resistance.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.