Front Door Courtesy Switch Circuit [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 Data List according to the display on the Techstream.

   Body Electrical > Main Body > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   FR Door Courtesy SW	Front door courtesy light switch assembly RH signal	OFF or ON	OFF: Front door RH closed ON: Front door RH open	-
   FL Door Courtesy SW	Front door courtesy light switch assembly LH signal	OFF or ON	OFF: Front door LH closed ON: Front door LH open	-

   Body Electrical > Main Body > Data List 

   Tester Display
   FR Door Courtesy SW
   FL Door Courtesy SW

   OK

   Normal conditions listed above are displayed.

   Result

   Result	Proceed to
   OK	A
   "FR Door Courtesy SW" is not normal	B
   "FL Door Courtesy SW" is not normal	C

Result: 

A 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [03/2017 - 06/2017]  , or refer to  PROBLEM SYMPTOMS TABLE [06/2017 - 09/2019]  , or refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 08/2021]  , or refer to  PROBLEM SYMPTOMS TABLE [08/2021 - ] 

Result: 

C 

See step  4

Result: 

B 

See step  2

1. Remove the front door courtesy light switch assembly RH.

   Refer to REMOVAL [03/2017 - ]

2. Inspect the front door courtesy light switch assembly RH.

   Refer to INSPECTION [03/2017 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH. Refer to  REMOVAL [03/2017 - ] 

Result: 

OK 

See step  3

1. Disconnect the K52 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
   R4-1 - K52-6 (FRCY)	Always	Below 1 Ω
   R4-1 or K52-6 (FRCY) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 10/2020]  , or refer to  REMOVAL [10/2020 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the front door courtesy light switch assembly LH.

   Refer to REMOVAL [03/2017 - ]

2. Inspect the front door courtesy light switch assembly LH.

   Refer to INSPECTION [03/2017 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH. Refer to  REMOVAL [03/2017 - ] 

Result: 

OK 

See step  5

1. Disconnect the K52 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
   R5-1 - K52-1 (FLCY)	Always	Below 1 Ω
   R5-1 or K52-1 (FLCY) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 10/2020]  , or refer to  REMOVAL [10/2020 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR