Flashing Yellow Indicator

Vehicle OFF, disconnect the X3 harness connector from T18 Battery Charger.
Test for infinite resistance between the terminals listed below at the X98 Hybrid/EV Battery Charger Receptacle:

Fig 1: X98 Hybrid/EV Battery Charger Receptacle And Terminals
Courtesy of GENERAL MOTORS COMPANY
- 110/220 V A/C Line 1 terminal E and 110/220 V A/C Neutral Line 2 terminal A
- 110/220 V A/C Line 1 terminal E and 110/220 V A/C Ground terminal C
- 110/220 V A/C Line 1 terminal E and Control pilot signal circuit terminal B
- 110/220 V A/C Line 1 terminal E and Proximity status signal circuit terminal D
- 110/220 V A/C Neutral Line 2 terminal A and 110/220 V A/C Ground terminal C
- 110/220 V A/C Neutral Line 2 terminal A and Control pilot signal circuit terminal B
- 110/220 V A/C Neutral Line 2 terminal A and Proximity status signal circuit terminal D
- 110/220 V A/C Ground terminal C and Control pilot signal circuit terminal B
- Control pilot signal circuit terminal B and Proximity status signal circuit terminal D
- If less than infinite resistance
1. Disconnect the harness connector from the X98 Hybrid/EV Battery Charger Receptacle.
2. Test for infinite resistance between the terminals listed below at the X98 Hybrid/EV Battery Charger Receptacle:
  
  Fig 2: X98 Hybrid/EV Battery Charger Receptacle And Terminals
  Courtesy of GENERAL MOTORS COMPANY
3. 110/220 V A/C Line 1 terminal E and 110/220 V A/C Neutral Line 2 terminal A
4. 110/220 V A/C Line 1 terminal E and 110/220 V A/C Ground terminal C
5. 110/220 V A/C Line 1 terminal E and Control pilot signal circuit terminal B
6. 110/220 V A/C Line 1 terminal E and Proximity status signal circuit terminal D
7. 110/220 V A/C Neutral Line 2 terminal A and 110/220 V A/C Ground terminal C
8. 110/220 V A/C Neutral Line 2 terminal A and Control pilot signal circuit terminal B
9. 110/220 V A/C Neutral Line 2 terminal A and Proximity status signal circuit terminal D
10. 110/220 V A/C Ground terminal C and Control pilot signal circuit terminal B
11. Control pilot signal circuit terminal B and Proximity status signal circuit terminal D
  - If less than infinite resistance, replace the X98 Hybrid/EV Battery Charger Receptacle and K114B Hybrid/EV Powertrain Control Module 2.
  - If infinite resistance
12. Disconnect the X2 harness connector from K114B Hybrid/EV Powertrain Control Module 2
13. Test for infinite resistance between the circuits.
  - If less than infinite resistance, repair the short between the circuits.
  - If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2.
- If infinite resistance
Replace the K114B Hybrid/EV Powertrain Control Module 2.