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Ignition Run Output Short

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn the ignition on. With the DRBIII® in Body Computer, record and erase BCM DTCs. Cycle the ignition from ON to OFF. Start the engine. With the DRBIII® in Body Computer, read BCM DTCs. If the DRBIII® displays "IGNITION RUN OUTPUT SHORT", go to the next step. If the DRBIII® does not display "IGNITION RUN OUTPUT SHORT", the condition that caused this DTC is currently not present. Use the wiring diagram/schematic as a guide, and inspect the related wiring harness for a possible intermittent condition.
    2. NOTE: Repeat this test until either the DTC is no longer present or all of the modules and components are disconnected from the Fused Ignition Switch Output (Run) circuit and the DTC is still present.
    NOTE: For the result of this test to be valid, disconnect only one module or component at a time and then verify if the DTC is still present.
  2. Turn the ignition off. Verify which of these modules and components are used on the vehicle you are diagnosing: HVAC (ATC or MTC); Rear ATC Control Switch; IP Switch Bank; Auto Daylight Mirror; Overhead Console; Heated Seat Module (Driver/Pass); Controller Anti-lock Brake. Using the wiring diagram/schematic as a guide, disconnect the harness connector with the Fused Ignition Switch Output (Run) circuit from one module or component identified above. Turn the ignition on. With the DRBIII® in Body Computer, erase BCM DTCs. Cycle the ignition form ON to OFF. Start the engine. With the DRBIII® in Body Computer, read BCM DTCs. If the DRBIII® displays "IGNITION RUN OUTPUT SHORT", go to the next step. If the DRBIII® does not display "IGNITION RUN OUTPUT SHORT", replace the module or the component that when disconnected did not reset the DTC.
    3. NOTE: All modules and components identified in step 2 must be disconnected from the BCM's Fused Ignition Switch Output (Run) circuit and the DTC must still be present for the result of this test to be valid.
  3. Turn the ignition off. Disconnect the Body Control Module (BCM) C3 and C4 harness connectors. See Figure and Figure . Measure the resistance between ground and the Fused Ignition Switch Output (Run) circuits in the BCM C3 harness connector. Measure the resistance between ground and the Fused Ignition Switch Output (Run) circuit in the BCM C4 harness connector. If the resistance is below 10K ohms on any of the circuits, repair the Fused Ignition Switch Output (Run) circuit(s) with a resistance below 10 k/ohms for a short to ground. If the resistance is above 10 k/ohms on any of the circuits, replace the Body Control Module (BCM). See BODY CONTROL MODULE  under REMOVAL & INSTALLATION.
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