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Home >> Buick >> 2018 >> Envision Preferred, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Clock Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: P6 Clock
  3. Verify a test lamp turns On between the test points: B+ circuit terminal 1 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points: B+ circuit terminal 1 & Output terminal @F36DAFuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for infinite resistance between the test points: B+ circuit terminal 1 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: P6 Clock
    • Go to next step: If the test lamp turns On 
  4. Test for less than 10 ohms between the test points: Ground circuit terminal 2@Component harness & Ground
    • If 10 ohms or greater 
    1. Disconnect the ground connection: G203
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 2@Component harness & Terminal G203
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  5. Test or replace the component: P6 Clock
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