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Home >> Cadillac >> 2018 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Data Communication System - Diagnostic Information And Procedures (B1000-U1833) >> Diagnostic Information and Procedures >> DTC P16B7 >> Circuit/System Testing
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Circuit/System Testing

NOTE:

Use the schematics and connector end views to identify the device's accessory wake up serial data 2 circuit terminals.

  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 X1 harness connector at the G1 A/C Compressor. It may take up to 10 min for all vehicle systems to power down.
  2. Vehicle in Service Mode.
  3. Verify that a test lamp illuminates between the accessory wake up serial data 2 circuit terminal 2 X1 and ground.
    • If the test lamp does not illuminate 
    1. Vehicle OFF and all vehicle systems OFF, remove the test lamp, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for less than 2 Ω between the G1 A/C Compressor wake up circuit terminal 2 X1 and the K114B Hybrid/EV Powertrain Control Module 2 wake up circuit terminal 69 X2.
      • If 2 Ω or greater, repair the open/high resistance in the accessory wake up serial data 2 circuit.
      • Go to next step: If less than 2 Ω
    3. Vehicle in Service Mode.
    4. Verify that a test lamp illuminates between the K114B Hybrid/EV Powertrain Control Module 2 accessory wake up serial data circuit terminal 67 X2 and ground.
      • If the test lamp does not illuminate, test the accessory wake up serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
      • Go to next step: If the test lamp illuminates
    5. Replace the K114B Hybrid/EV Powertrain Control Module 2.
    • Go to next step: If the test lamp illuminates 
  4. Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. It may take up to 10 min for all vehicle systems to power down.
  5. Verify that a test lamp does not illuminates between the accessory wake up serial data 2 circuit terminal 2 X1 and ground.
    • If the test lamp illuminates 

      Test the accessory wake up serial data 2 circuit for a short to voltage. If the circuit tests normal, replace the K114B Hybrid/EV Powertrain Control Module 2.

    • Go to next step: If the test lamp does not illuminate 
  6. Vehicle OFF, inspect both harness and component connectors for contamination, corrosion, and terminal tension.
  7. Reconnect the X1 harness connector at the G1 A/C Compressor.
  8. Vehicle in Service Mode.
  9. Clear DTC.
  10. Verify that DTC P16B7 is not set again.
    • If the DTC is set 

      Test or replace the G1 A/C Compressor.

    • Go to next step: If the DTC is not set 
  11. All OK.
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