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Home >> Buick >> 2017 >> Envision Base >> Repair and Diagnosis (Single Page) >> Electrical >> Body Electrical >> Power Outlets >> Diagnostic Information and Procedures >> DTC B151E: Accessory DC/AC Power Inverter Module Relay Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING:

To help avoid personal injury, always treat the accessory power receptacle, accessory DC/AC power inverter module, AC circuit wires, and connectors as if AC high-voltage is present.

  1. Ignition OFF/Vehicle OFF and all vehicle systems OFF, nothing plugged into the X81 Accessory Power Receptacle - 110V AC. Disconnect the X1 and X2 harness connectors at the T1 Accessory DC/AC Power Inverter Module. It may take up to 2 min for all vehicle systems to power down..
  2. Test for less than 10 Ω between the ground circuit terminal 2 X1 and ground.
    • If greater than 10 Ω 
    1. Ignition OFF/Vehicle OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • 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.
    • If less than 10 Ω 
  3. Ignition OFF/Vehicle OFF, disconnect the KR80 Accessory Relay, ignition on/vehicle in Service Mode.
  4. Verify a test lamp illuminates between the ignition circuit terminal B4 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF/Vehicle OFF, remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF/Vehicle OFF, remove the test lamp.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the KR80 Accessory Relay
    • If the test lamp illuminates 
  5. Verify a test lamp illuminates between the B+ circuit terminal B2 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF/Vehicle OFF, remove the test lamp.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, 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/Vehicle OFF, remove the test lamp.
    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 infinite resistance,
    3. Test for infinite resistance between the control circuit terminal B8 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the KR80 Accessory Relay.
    • If the test lamp illuminates 
  6. Ignition OFF/Vehicle OFF, connect the KR80 Accessory Relay.
  7. Connect a test lamp between T1 Accessory DC/AC Power Inverter Module connector terminal 1 X1 and ground.
  8. Ignition ON/Vehicle in Service Mode, connect a 7.5 A fused jumper wire between the T1 Accessory DC/AC Power Inverter Module connector control circuit terminal 4 X2 and ground. Verify the test lamp illuminates.
    • If the test lamp does not illuminate 
    1. Ignition OFF/Vehicle OFF, remove the test lamp and fused jumper.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the KR80 Accessory Relay.
    • If the test lamp illuminates 
  9. Test or replace the T1 Accessory DC/AC Power Inverter Module.
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