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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 350 (Rear Drive Axle) >> Diagnostic Information and Procedures >> All Wheel Drive Indicator Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF/Vehicle OFF, disconnect the X1 harness connector at the K47 Rear Differential Clutch Control Module. Ignition ON/Vehicle In Service Mode.
  2. Verify the AWD indicator is not illuminated.
    • If illuminated 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the S126 Drive Mode Select Switch.
    2. Test for infinite resistance between the control circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the S126 Drive Mode Select Switch.
    • If not illuminated 
  3. Ignition ON/Vehicle In Service Mode, connect a 3 A fused jumper wire between the control circuit terminal 2 and the ground.
  4. Verify the AWD indicator is illuminated.
    • If not illuminated 
    1. Ignition OFF/Vehicle OFF, remove the jumper wire, disconnect the harness connector at the S126 Drive Mode Select Switch, ignition ON/Vehicle In Service Mode.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S126 Drive Mode Select Switch.
    • If illuminated 
  5. Replace the K47 Rear Differential Clutch Control Module.
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