ACC Signal Circuit [06/2016 - 03/2017]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Data List.
5. Read the display on the Techstream.

   OK

   Normal conditions listed above are displayed.

   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   ACC SW	Ignition switch ACC signal/ON or OFF	ON: Ignition switch ACC OFF: Ignition switch off	-

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [06/2016 - 03/2017] )

Result: 

NG 

See step  2

1. Disconnect the 3A and 3E instrument panel junction block assembly connectors.
2. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   3E-1 - Body ground	Always	11 to 14 V
   3A-20 - Body ground	Ignition switch ACC	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3A-12 - Body ground	Always	Below 1 Ω
   3A-13 - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to instrument panel junction block assembly)

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Remove the instrument panel junction block assembly (Refer to REMOVAL [06/2016 - ] ).
2. Remove the main body ECU (network gateway ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Component without harness connected (Instrument panel junction block assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3E-1 - MB-9 (ACC)	Battery voltage not applied to 3A-20 and 3A-12 or 3A-13	10 kΩ or higher
   3E-1 - MB-9 (ACC)	Battery positive (+) → 3A-20 Battery negative (-) → 3A-12 or 3A-13	Below 1 Ω

Result: 

OK 

REPLACE MAIN BODY ECU (NETWORK GATEWAY ECU) 

(Refer to REMOVAL [06/2016 - ] )

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

(Refer to REMOVAL [06/2016 - ] )