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Circuit/System Testing

WARNING: This page is about a different car, the 2013 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the generator control module cable cover. Refer to Generator Control Module Cable Cover Replacement .
  2. Remove the X10 B+ cable at the K59 starter generator control module, and tape the cable ring terminal.
  3. Connect a 3A fused jumper wire between C1 12-volt positive battery post and the K59 starter generator control module X10 B+ terminal.
  4. Connect C1 12V battery negative terminal.
  5. Ignition ON, observe the scan tool parameter Low-Voltage Circuit Voltage in the 14V Power Module data list. The parameter should be within 0.5 volt of the actual 12-volt battery voltage.
    • If the voltage is not within the specified range, replace the K59 starter generator control module.
  6. Ignition OFF, remove the 3A fused jumper wire at the C1 12-volt battery.
  7. Disconnect the C1 12V battery positive terminal and measure the resistance of the 14 V Power Module positive harness between the X10 connector at the K59 starter generator control module and the C1 12V battery positive terminal.
    • If the resistance is greater than 1.0 Ω, repair the high resistance condition in the 12-volt circuit.
    • If the resistance is less than 1.0 Ω, replace the K59 starter generator control module.
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