Engine Hood Courtesy Switch Circuit [06/2018 - 08/2021]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Data List.
5. Read the Data List according to the display on the Techstream.

   Body Electrical > Main Body > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Hood Courtesy SW	Engine hood courtesy switch	OFF or ON	OFF: Engine hood closed ON: Engine hood open	-

   Body Electrical > Main Body > Data List 

   Tester Display
   Hood Courtesy SW

   OK

   The Techstream display changes correctly in response to the engine hood courtesy switch (hood lock assembly) status.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2018 - 08/2021] 

Result: 

NG 

See step  2

1. Remove the hood lock assembly.

   Refer to REMOVAL [06/2018 - 08/2020] , or refer to REMOVAL [08/2020 - ]

2. Inspect the engine hood courtesy switch (hood lock assembly).

   Refer to INSPECTION [06/2018 - 08/2021]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY). Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

Result: 

OK 

See step  3

1. Disconnect the G37 main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G37-30 (HCTY) - A18-2 (+)	Always	Below 1 Ω
   G37-30 (HCTY) or A18-2 (+) - Other terminals and body ground	Always	10 kΩ or higher
   A18-1 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2018 - 08/2021] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR