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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1348 (Transfer Case - Mp 3023/3024-NQH) >> Diagnostic Information and Procedures >> DTC B0785 >> Component Testing >> BCM

Component Testing: BCM

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Key OFF. Disconnect the X1 connector at the TCSCS.
  2. Using the L-BU probe J 35616-64B, connect a DVMM between TCSCS harness X1 pin 4 and a good ground.
  3. Key ON, engine OFF.
  4. Verify that the voltage is greater than 10 V.
    • If the voltage is less than 10 V, replace the BCM.
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