Inspection Procedure

1. Turn the ignition switch to the ON position.
2. Measure the voltage between the terminals of the H34 and H31 HV control ECU connectors.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   +B1 (H34-2) - E1 (H31-5)	9 to 14 V
   +B2 (H34-1) - E1 (H31-5)	9 to 14 V

Fig 1: Identifying Terminals Of H34 And H31 HV Control ECU Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

NG: Go to next step 

1. Disconnect the H31 HV control ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open) 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   E1 (H31-5) - Body ground	Below 1 Ω

3. Reconnect the HV control ECU connector.
Fig 2: Identifying Terminals Of H31 HV Control ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Turn the ignition switch to the ON position.
2. Measure the voltage between the terminals of the H29 and H31 HV control ECU connectors.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   IGSW (H29-9) - E1 (H31-5)	9 to 14 V

Fig 3: Identifying Terminals Of H29 And H31 HV Control ECU Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step  6

NG: Go to next step 

1. Remove the IGN fuse from the instrument panel J/B.
2. Measure the IGN fuse resistance.

   Standard resistance: Below 1 Ω 

3. Reinstall the IGN fuse.
Fig 4: Identifying IGN Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE 

OK: Go to next step 

1. Check for continuity between the connector terminals shown in the table below.

   Standard 

   TERMINALS CONTINUITY REFERENCE
   
   

   Switch	Terminal No.	Resistance
   LOCK	All Terminals	No continuity
   ACC	1 - 2	Continuity
   ON	2 - 3, 2 - 4, 3 - 4, 6 - 7	Continuity
   START	1 - 2, 1 - 4, 2 - 4, 6 - 7, 6 - 8, 7 - 8	Continuity

   Fig 5: Identifying Terminals Of Ignition Switch Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE IGNITION SWITCH ASSEMBLY 

OK: CHECK AND REPLACE HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - HV CONTROL ECU) 

1. Turn the ignition switch to the ON position.
2. Measure the voltage between the terminals of the H34 and H31 HV control ECU connectors.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   MREL (H34-12) - E1 (H31-5)	9 to 14 V

Fig 6: Identifying Terminals Of H34 And H31 HV Control ECU Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE HV CONTROL ECU 

OK: Go to next step 

1. Remove the IGCT No. 2 fuse from the R/B No. 3.
2. Measure the IGCT No. 2 fuse resistance.

   Standard resistance: Below 1 Ω 

3. Reinstall the IGCT No. 2 fuse.
Fig 7: Identifying IGCT No. 2 Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE 

OK: Go to next step 

1. Remove the IGCT relay from the engine room R/B.
2. Measure the IGCT relay resistance.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   	Below 1 Ω (Apply battery voltage between terminals 1 and 2)

Fig 8: Measuring IGCT Relay Resistance
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE IGCT RELAY 

OK: Go to next step 

1. Check the harness and the connectors between the integration relay and the HV control ECU.
   1. Remove the IGCT relay from the engine room R/B.
   2. Disconnect the H34 HV control ECU connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      IGCT relay (1) - MREL (H34-12)	Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      IGCT relay (1) or MREL (H34-12) - Body ground	10 kΩ or higher

2. Check the harness and the connectors between the IGCT relay and body ground.
   1. Remove the IGCT relay from the engine room R/B.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified condition
      IGCT relay (2) - Body ground	Below 1 Ω

Fig 9: Identifying Terminals Of H34 HV Control ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: CHECK AND REPAIR HARNESS AND CONNECTOR (TERMINAL +B OF HV CONTROL ECU - BATTERY POSITIVE TERMINAL)