Inspection Procedure

1. Remove the ECU-IG RH fuse from the cowl side J/B RH.
2. Remove the MPX-B fuse from the engine room J/B No. 1.

   Standard resistance: 

   Below 1 Ω 

NG: REPLACE FUSE 

OK: Go to next step. 

1. Disconnect the J26 ECU connector.
2. Measure the voltage and resistance of the wire harness side connector.

   Standard voltage 

   TESTER CONNECTION AND SPECIFIED CONDITION TABLE
   
   

   Tester Connection	Condition	Specified Condition
   B (J26-1) - Body ground	Always	10 to 14 V
   IG (J26-2) - Body ground	Engine switch on (IG)	10 to 14 V

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION TABLE
   
   

   Tester Connection	Specified Condition
   E (J26-5) - Body ground	Below 1 ohms

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 1: Identifying Combination Switch Assembly Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step. 

1. Disconnect the J26, J76 and J55 ECU connectors.
2. Measure the resistance between the specified terminals on the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION TABLE
   
   

   Tester Connection	Specified Condition
   MPX1 (J26-6) - MPD2 (J76-12)	Below 1 ohms
   MPX2 (J26-7) - MPX1 (J55-7)	Below 1 ohms

   Result 

   RESULT DESCRIPTION TABLE
   
   

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

B: REPAIR OR REPLACE HARNESS OR CONNECTOR AND REPLACE COMBINATION SWITCH ASSEMBLY 

C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Identifying Gateway ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

A: REPLACE COMBINATION SWITCH ASSEMBLY