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Circuit/System Testing

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.
IMPORTANT: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected.
  • SDM
  • SDM wiring harness
  1. Ignition OFF, remove the underhood AIR BAG IGN fuse 39.
  2. Ignition ON, test for 9-16 V between the voltage supply side and ground.
  3. Ignition OFF, remove the SDM harness connector.
  4. Ignition OFF, test for less then 1 ohm between the ignition 1 voltage circuit terminal 32 and the underhood fuse block terminal G2 (X5).
    • If greater then the specified range, test the circuit for an open/high resistance.
  5. Ignition ON, test for less then 1 volt between the SDM harness connector ignition 1 voltage circuit terminal 32 and the underhood fuse block terminal G2 (X5).
    • If greater then the specified value, test the circuit for a short to voltage.
  6. If all circuits test normal, reconnect all connectors, replace fuse, clear all DTCs. If DTC B1370 stays current, replace the SDM.
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