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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect and remove the underhood fuse block (UBEC) and housing.
  2. Connect the engine harness connectors X2 and X3 to the UBEC.
  3. Connect the red lead of a DMM to the control circuit terminal X1-33. Connect the black lead to ground. Set the DMM on the diode setting. Ignition ON, the DMM should display OL.
    • If less than the specified range, test the relay coil control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
  4. Command the cooling fan relay ON and OFF at low speed, with a scan tool. The DMM should transition from OL when commanded OFF to less than 1 V when commanded ON.
    • If the circuit voltage does not correspond to the specified values, test the control circuit for an open/high resistance or for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  5. If all circuits test normal, test or replace the X50A UBEC.
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