Inspection Procedure

1. Measure the voltage according to the value(s) in the table below.
   STANDARD VOLTAGE SPECIFIED CONDITION
   
   

   Tester connection	Condition	Specified condition
   MACC - Body ground	Ignition switch on (ACC)	4 to 6 V

NG: REPLACE NAVIGATION ECU 

Fig 1: Inspecting Navigation ECU

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OK: GO TO NEXT STEP 

1. Disconnect the navigation ECU connector M18.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFIED CONDITION
   
   

   Tester connection	Condition	Specified condition
   SNSE - Body ground	Always	Below 1

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Disconnecting Navigation ECU Connector M18

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OK: GO TO NEXT STEP 

1. Disconnect the overhead J/B connector O5 and navigation ECU connector M18.
2. Measure the resistance according to the value(s) in the table below.
   STANDARD RESISTANCE SPECIFIED CONDITION
   
   

   Tester connection	Condition	Specified condition
   MACC - ACC	Always	Below 1
   MIC+ - MI1+	Always	Below 1
   MIC- - MIC-	Always	Below 1
   MACC - Body ground	Always	10 k or higher
   MIC+ - Body ground	Always	10 k or higher
   MIC- - Body ground	Always	10 k or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 3: Disconnecting Overhead J/B Connector O5 And Navigation ECU Connector M18

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE