DTC P0ADF-229: Hybrid Battery Negative Contactor Control Circuit Low; DTC P0AE0-228: Hybrid Battery Negative Contactor Control Circuit High: Procedure

1. Turn the power switch off.
2. Disconnect connector E55 from the hybrid vehicle control ECU.
3. Disconnect the battery pack wire connector. Refer to REMOVAL .
   Fig 1: Locating Battery Pack Wire Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Turn the power switch on (IG).
5. Measure the voltage according to the value(s) in the table below.
   Fig 2: Checking Harness And Connector (Hybrid Vehicle Control ECU - Battery Pack Wire Connector)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   E55-4 (SMRG) - Body ground	Power switch on (IG)	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle control ECU and battery pack wire connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

6. Turn the power switch off.
7. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Switch Condition	Specified Condition
   E55-4 (SMRG) - zR2-2 (CON3)	Power switch off	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Switch Condition	Specified Condition
   E55-4 (SMRG) or zR2-2 (CON3) - Body ground and other terminals	Power switch off	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

NG → See step   4 

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   6 

1. Check that the service plug grip is not installed.
2. Disconnect the HV battery junction block connector.
3. Remove the HV battery junction block from the vehicle. Refer to REMOVAL .
4. Measure the resistance according to the value(s) in the table below.
   Fig 3: Inspecting HV Battery Junction Block (SMRG)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   g3-1 - z34-1	Auxiliary battery voltage is not applied between terminals z38-1 (CON3) and z38-2 (GND).	10 kΩ or higher
   g3-1 - z34-1	Auxiliary battery voltage is applied between terminals z38-1 (CON3) and z38-2 (GND).	Below 1 Ω

5. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   z38-1 (CON3) - z38-2 (GND)	-31 to 176°F (-35 to 80°C)	18.8 to 32.1 Ω

NG → See step   5 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR