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Home >> GMC >> 2021 >> Terrain SL >> Repair and Diagnosis >> Accessories & Equipment >> Collision/Avoidance >> Parking Assistance Systems >> Diagnostic Information and Procedures >> Parallel Parking Assist System Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: S107 Parking Assist On/Off Switch
  3. Verify a test lamp turns On between the test points: Ground circuit terminal 8 & B+
    • If the test lamp does not turn On 
    1. Disconnect the electrical connector: X3 @ K182 Parking Assist Control Module
    2. Test for less than 2 Ω between the test points: Ground circuit terminal 8 & Ground Connection
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Repair the open/high resistance in the ground connection. K182 Parking Assist Control Module
    • Go to next step: If the test lamp turns On 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify the scan tool parameter: Advanced Parking Assist Switch = Inactive
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K182 Parking Assist Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 2 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K182 Parking Assist Control Module
    • Go to next step: If the specified state 
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Ground
  7. Verify the scan tool parameter: Advanced Parking Assist Switch = Active
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: K182 Parking Assist Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 2 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 Ω between the test points: Signal circuit terminal 2 @ Component harness & Signal circuit terminal 10 @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component: K182 Parking Assist Control Module
    • Go to next step: If the specified state 
  8. Test or replace the component: S107 Parking Assist On/Off Switch
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