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Testing the Device Circuits

  1. Vehicle OFF, all access doors closed, all vehicle systems OFF and all keys at least 3 m (9.8 ft) away from vehicle. Disconnect the harness connectors at an easily accessible device that is not communicating. It may take up to 2 min for all vehicle systems to power down.
  2. Disconnect the harness connectors at an easily accessible device that is not communicating.
  3. Test for less than 10 Ω between the low reference circuit terminal and ground, at the device connector that was just disconnected.
    • If 10 Ω or greater 
    1. Vehicle OFF, disconnect the harness connectors at the device that controls the low reference circuit.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the device that controls the low reference circuit.
    • If less than 10 Ω 
  4. Vehicle in Service Mode.
  5. Test for 4.8-5.2 V between the 5 V reference circuit terminal and ground, at the device connector that was just disconnected.
    • If less than 4.8 V 
    1. Vehicle OFF, disconnect the harness connectors at the device that controls the 5 V reference circuit.
    2. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the 5 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the device that controls the 5 V reference circuit.
    • If greater than 5.2 V 
    1. Vehicle OFF, disconnect the harness connectors at the device that controls the 5 V reference circuit, Vehicle in Service Mode.
    2. Test for less than 1 V between the 5 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the device that controls the 5 V reference circuit.
    • If between 4.8-5.2 V 
  6. Vehicle in Service Mode.
  7. Test for 4.8-5.2 V between the high voltage fault signal circuit terminal and ground, at the device connector that was just disconnected.
    • If less than 4.8 V 
    1. Vehicle OFF, disconnect the harness connectors at the device that controls the high voltage fault signal circuit.
    2. Test for infinite resistance between the high voltage fault signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the high voltage fault signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the device that controls the high voltage fault signal circuit.
    • If greater than 5.2 V 
    1. Vehicle OFF, disconnect the harness connectors at the device that controls the high voltage fault signal circuit, Vehicle in Service Mode.
    2. Test for less than 1 V between the high voltage fault signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the device that controls the high voltage fault signal circuit.
    • If between 4.8-5.2 V 
  8. Replace the device that was just disconnected.
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