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Home >> GMC >> 2024 >> Terrain AT4 >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Secondary And Configurable Customer Controls >> Diagnostic Information and Procedures >> Drive Mode Switch Malfunction (GMC) >> Circuit/System Testing >> Test 2

Test 2

  1. Ignition - On / Vehicle - In Service Mode
  2. Headlamp Switch = On
  3. Verify a test lamp turns On between the test points: Control circuit terminal 8 & Ground
    • Go to next step: If the test lamp turns On 
  4. Ignition/Vehicle - Off & Remove - Test lamp
  5. Connect the electrical connector: S126 Drive Mode Select Switch
  6. Disconnect the electrical connector: X2 & X5 @ K9 Body Control Module
  7. Ignition - On / Vehicle - In Service Mode
  8. Test for less than 1 V between the test points:
    • Signal circuit terminal 15 X5 & Ground
    • Signal circuit terminal 21 X5 & Ground
    • { V92 } Signal circuit terminal 23 X5 & Ground
    • { F48 } Signal circuit terminal 6 X2 & Ground
    • If 1 V or greater 
    1. Disconnect the electrical connector: S126 Drive Mode Select Switch
    2. Test for less than 1 V between the test points:
      • Signal circuit terminal 15 X5 & Ground
      • Signal circuit terminal 21 X5 & Ground
      • { V92 } Signal circuit terminal 23 X5 & Ground
      • { F48 } Signal circuit terminal 6 X2 & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: S126 Drive Mode Select Switch
    • Go to next step: If less than 1 V 
  9. Ignition/Vehicle - Off
  10. Test for infinite resistance between the test points:
    • Signal circuit terminal 15 X5 & Ground
    • Signal circuit terminal 21 X5 & Ground
    • { V92 } Signal circuit terminal 23 X5 & Ground
    • { F48 } Signal circuit terminal 6 X2 & Ground
    • If less than infinite resistance 
    1. Disconnect the electrical connector: S126 Drive Mode Select Switch
    2. Test for infinite resistance between the test points:
      • Signal circuit terminal 15 X5 & Ground
      • Signal circuit terminal 21 X5 & Ground
      • { V92 } Signal circuit terminal 23 X5 & Ground
      • { F48 } Signal circuit terminal 6 X2 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: S126 Drive Mode Select Switch
    • Go to next step: If infinite resistance 
  11. Connect a 3 A fused jumper wire between each of the following circuit pairs, one at a time:
    • Signal circuit terminal 15 X5 & Ground
    • Signal circuit terminal 21 X5 & Ground
    • { V92 } Signal circuit terminal 23 X5 & Ground
    • { F48 } Signal circuit terminal 6 X2 & Ground
  12. Verify the component works as specified: Drive Mode - LED (Light Emitting Diode) @ S126 Drive Mode Select Switch = On
    • If the component does not work as specified 
    1. Disconnect the electrical connector: S48E Multifunction Switch - Center Console
    2. Ignition/Vehicle - Off
    3. Test for less than 2 ohms between the test points:
      • Signal circuit terminal 15 X5 @ Control module harness & Signal circuit terminal 18 @ Component harness
      • Signal circuit terminal 21 X5 @ Control module harness & Signal circuit terminal 4 @ Component harness
      • { V92 } Signal circuit terminal 23 X5 @ Control module harness & Signal circuit terminal 6 @ Component harness
      • { F48 } Signal circuit terminal 6 X2 @ Control module harness & Signal circuit terminal 16 @ Component harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: S48E Multifunction Switch - Center Console
    • Go to next step: If the component works as specified 
  13. Replace the component: K9 Body Control Module
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