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Circuit/System Testing

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, remove the F103 drive motor generator control module sight shield. Refer to Drive Motor Generator Control Module Sight Shield Replacement .
  2. Disconnect the T6 drive motor generator power inverter module X1 connector and the ECM X3 connector.
  3. Test for less than 1 Ω between the serial data circuits listed below:
    • T6 drive motor generator power inverter module X1 connector terminal 10 and K20 ECM X3 connector terminal 33
    • T6 drive motor generator power inverter module X1 connector terminal 11 and K20 ECM X3 connector terminal 53
    • If greater than the specified range, test the serial data circuit for an open/high resistance condition. If the circuit tests normal, replace the K20 ECM.
  4. If the DTC is set, program the T6 drive motor generator power inverter module. If the DTC resets, replace the T6 drive motor generator power inverter module.
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