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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1347 (Transfer Case - Mp 1625/1626-NQF) >> Diagnostic Information and Procedures >> DTC B0790 >> Component Testing >> BCM

Component Testing: BCM

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis 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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