Inspection Procedure

1. Disconnect the D44 ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   D44-33 (AM1) - Body ground	Always	10 to 14 V
   D44-12 (AM2) - Body ground		10 to 14 V

3. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying Power Source Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   D44-6 (GND2) - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step. 

1. Disconnect the D44, D37 and D39 ECU connectors.
2. Measure the resistance according to the value(s) in the table below.

   Resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   D44-7 (MPX1) - D39-28 (MPX2)	Always	Below 1 Ω
   D44-24 (MPX2) - D37-30 (MPX+)		Below 1 Ω

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   Both are OK	A
   One is OK	B
   Both are NG	C

B : REPLACE POWER SOURCE CONTROL ECU AND REPAIR OR REPLACE HARNESS OR CONNECTOR 

C : REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Identifying Power Source Control ECU, A/C ECU And Certification ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

A : REPLACE POWER SOURCE CONTROL ECU