Inspection Procedure

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS AND CONNECTOR (ST2 TERMINAL VOLTAGE)

Disconnect the H29 connector from the HV control ECU.

Measure the voltage according to the value(s) in the table below when the ignition switch is off.

Standard Voltage

ST2 TERMINAL VOLTAGE

Tester Connection	Specified Condition
ST2 (H29-20) - Body ground	Below 1 V

Fig 1: Checking Harness And Connector (ST2 Terminal Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step 3

NG: GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - IGNITION SWITCH)

Turn the ignition switch OFF.
Disconnect the I14 ignition switch connector.

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

Standard Voltage

HV CONTROL ECU - IGNITION SWITCH

Tester Connection	Specified Condition
ST2 (H29-20) or ST2 (I14-8) - Body ground	Below 1 V

Fig 2: Checking Harness And Connector (HV Control ECU - Ignition Switch)

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE IGNITION SWITCH ASSEMBLY

CLEAR DTC (HV)
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to the ON position.
3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DTC INFO / CLEAR CODES.
RECONFIRM OUTPUT DTC (HV)
1. Turn the ignition switch off.
2. Turn the ignition switch to the ON position again and leave the vehicle as it is for approximately 5 seconds.
3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DTC INFO / CURRENT CODES.
4. Read output DTC. (See DTC CHECK / CLEAR )
  OK:
  
  DTC P0617-142 is output again.
NO: CHECK FOR INTERMITTENT PROBLEMS

YES: REPLACE HYBRID VEHICLE CONTROL ECU