Inspection Procedure

1. Disconnect the D13 combination switch connector.
2. Measure the voltage according to the value(s) in the table below.

   Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   D13-1 (B) - Body ground	Always	10 to 14 V
   D13-2 (IG) - Body ground	Ignition switch off → on (IG)	0 V → 10 to 14 V

3. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying Combination Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   D13-5 (E) - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step. 

1. Disconnect the D13, D6, and D39^*1 or D37^*2 ECU connectors.
2. Measure the resistance according to the value(s) in the table below.

   Resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   D13-6 (MPX1) - D6-21 (MPX2)	Always	Below 1 Ω
   D13-7 (MPX2) - D39-27 (MPX1)*1		Below 1 Ω
   D13-7 (MPX2) - D37-30 (MPX+)*2		Below 1 Ω
   HINT: *1 : w/ Smart key system *2 : w/o Smart key system

   Result 

   RESULT REFERENCE
   
   

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

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

C : REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Identifying Combination Switch, Body ECU And Certification ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

A : REPLACE COMBINATION SWITCH