Inspection Procedure

1. Remove the MPX-B3 fuse from the passenger side junction block.
2. Measure the resistance of the fuse.

   Standard resistance: Below 1 Ω 

NG: REPLACE FUSE 

OK: Go to next step. 

1. Disconnect the 2G junction block connector.
2. Disconnect the D4 ECU connector.
   Fig 1: Identifying 2G Junction Block Connector And D4 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the voltage and resistance of the wire harness side connectors.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   D4-5 (MPX-B) - Body ground	10 to 14 V

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   D4-1 (GND2) - Body ground	Below 1 Ω
   2G-8 (GND) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step. 

Fig 2: Identifying D2, D4, T8 And A31 ECU Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the D2, D4, T8 and A31 ECU connectors.
2. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   D2-15 (MPX1) - A31 -6 (MPX2)	Below 1 Ω
   D4-7 (MPX2) - T8-7 (MPX1)	Below 1 Ω

   Result 

   RESULT CHART
   
   

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

B: REPLACE DRIVER SIDE JUNCTION BLOCK AND REPAIR OR REPLACE HARNESS AND CONNECTOR 

C: REPAIR OR REPLACE HARNESS AND CONNECTOR 

A: REPLACE DRIVER SIDE JUNCTION BLOCK