Interior Light Switch Signal Circuit [09/2020 - ]: 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
   Dome Light DOOR SW	Door switch signal	ON or OFF	ON: Door switch pressed OFF: Door switch not pressed	-
   Dome Light SW	Front dome light switch signal	ON or OFF	ON: Front dome light switch ON OFF: Front dome light switch OFF	-

   Body Electrical > Main Body > Data List 

   Tester Display
   Dome Light DOOR SW
   Dome Light SW

   OK

   Normal conditions listed above are displayed.

   Result

   Result	Proceed to
   OK	A
   NG (Dome Light DOOR SW is not normal)	B
   NG (Dome Light SW is not normal)	C

Result: 

A 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2020 - 09/2022]  , or refer to  PROBLEM SYMPTOMS TABLE [09/2022 - ]  

Result: 

C 

See step  4

Result: 

B 

See step  2

1. Remove the map light assembly.

   Refer to REMOVAL [09/2020 - 09/2022] , or refer to REMOVAL [09/2022 - ]

2. Inspect the map light assembly.

   Refer to INSPECTION [09/2020 - 09/2022] , or refer to INSPECTION [09/2022 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [09/2020 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

Result: 

OK 

See step  3

1. Disconnect the K1 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
   S4-18 (DOOR) - K1-27 (DMDR)	Always	Below 1 Ω
   S4-19 (CILL) - K1-28 (DMON)	Always	Below 1 Ω
   S4-20 (GND9) - Body ground	Always	Below 1 Ω
   S4-18 (DOOR) or K1-27 (DMDR) - Body ground	Always	10 kΩ or higher
   S4-19 (CILL) or K1-28 (DMON) - 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 [04/2013 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the K1 main body ECU (multiplex network body ECU) connector.
2. Disconnect the S4 map light assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S4-19 (CILL) - K1-28 (DMON)	Always	Below 1 Ω
   S4-20 (GND9) - Body ground	Always	Below 1 Ω
   S4-19 (CILL) or K1-28 (DMON) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Replace the map light assembly with a new or known good one.

   Refer to REMOVAL [09/2020 - 09/2022] , or refer to REMOVAL [09/2022 - ]

2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Body Electrical / Main Body / Data List.
6. 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
   Dome Light SW	Front dome light switch signal	ON or OFF	ON: Front dome light switch ON OFF: Front dome light switch OFF	-

   Body Electrical > Main Body > Data List 

   Tester Display
   Dome Light SW

   OK

   Normal conditions listed above are displayed.

   Result

   Result	Proceed to
   Dome Light SW is normal	A
   Dome Light SW is not normal	B

Result: 

A 

END (MAP LIGHT ASSEMBLY WAS DEFECTIVE) 

Result: 

B 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [04/2013 - ]