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Circuit/System Testing

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  1. Ignition OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3m (9.8ft) away from vehicle. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 2Ω between each of the X84 Data Link Connector ground circuit terminals listed below and ground.
    • Ground circuit terminal 4
    • Ground circuit terminal 5
    • If 2Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2Ω in the ground circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, repair the open/high resistance in the ground connection.
    • If less than 2Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal 16 at the X84 Data Link Connector and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2Ω in the B+ circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
    • If the test lamp illuminates 
  5. Refer to the scan tool user guide.
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