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Circuit/System Verification

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  1. Ignition OFF, measure and record the battery voltage at the C1 12V battery terminals. The battery voltage should stabilize between 12.4 and 12.8 V within a few minutes of turning the ignition OFF.
  2. Ignition ON, observe the scan tool Ignition 1 Signal parameter in the 14V Power Module data list. The parameter should be within 4.5 volts of the Low Voltage Circuit Voltage measured at the C1 12V battery.
    • If the voltage is not within the specified range, check the ignition circuit to the K59 starter generator control module for high resistance.
  3. Remove the B+ terminal at the K59 starter generator control module.
  4. Connect a test lamp between C1 12-volt positive battery post and the K59 starter generator control module terminal at the module.
  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 positive connection at the C1 12-volt battery.
  7. Measure the resistance of the 14 V Power Module positive harness between the X10 connector at the K59 starter generator control module and the X50A fuse block-underhood connection.
    • 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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