Inspection Procedure

HINT:

Operating the engine switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
   1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
   CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
   NOTE:

   • w/ Navigation System:

     After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.

   • When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See INITIALIZATION ).
2. CHECK FOR OPEN IN CAN BUS WIRE (DISPLAY AND NAVIGATION MODULE DISPLAY OR MULTI-DISPLAY BRANCH WIRE) 
   1. Disconnect the F28 display and navigation module display*1 or multi-display*2 connector.

      *1: w/ Navigation System

      *2: w/o Navigation System

   2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   F28-26 (CANH) - F28-25 (CANL)	Engine switch off	54 to 69 Ω

   NG: REPAIR OR REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY OR MULTI-DISPLAY BRANCH WIRE OR CONNECTOR (CANH, CANL) 

   Fig 1: Checking For Open In CAN Bus Wire (Display And Navigation Module Display Or Multi-Display Branch Wire)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step 

3. CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY OR MULTI-DISPLAY - BATTERY AND BODY GROUND) 
   1. Connect the cable to the negative (-) battery terminal.
      NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See INITIALIZATION ).
   2. Disconnect the F28 display and navigation module display*1 or multi-display*2 connector.

      *1: w/ Navigation System

      *2: w/o Navigation System

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      F28-10 (GND1) - Body ground	Always	Below 1 Ω

      Fig 2: Checking Harness And Connector (Display And Navigation Module Display Or Multi-Display - Battery And Body Ground)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   F28-1 (+B1) - Body ground	Always	11 to 14 V
   F28-2 (ACC) - Body ground	Engine switch on (ACC)	11 to 14 V
   F28-3 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   OK (w/ Navigation System)	A
   OK (w/o Navigation System)	B
   NG	C

   B: REPLACE MULTI-DISPLAY  (See REMOVAL )

   C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   A: REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY  (See REMOVAL )