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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1038 (Wiring Systems And Power Management - DTC B1370 To DTC B1440) >> DTC B1433 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, verify DTC B1433 is set as current.
    • If DTC B1433 is not set as current, operate the vehicle within the Conditions for Setting the DTC.
    2. IMPORTANT: When cycling the ignition, keep ignition OFF for 5 seconds before checking for current DTC.
  2. Ignition OFF, disconnect each of the following components one at a time. After each component is disconnected, cycle the ignition and verify DTC B1475 remains set as current. The components may be disconnected in any order.
    • HVAC module X2
    • Windshield washer solvent heater X2 (with RPO XA7)
    • If DTC B1433 does not remain set as current, test or replace the last component that was disconnected.
  3. Ignition OFF, disconnect the X5 harness connector at the BCM.
  4. Test for greater than 70 ohms of resistance between the BCM ignition 3 voltage circuit terminal 13 and ground.
    • If less than specified, test the control circuit for a short to ground. If the circuit tests normal, replace the underhood fuse block.
  5. If the circuit tests normal, test or replace the BCM.
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