Ambient Light Switch Circuit [04/2018 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power 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
   Ceiling Light SW	Mood switch signal	OFF or ON	OFF: Mood switch not pressed ON: Mood switch pressed	-

   Body Electrical > Main Body > Data List 

   Tester Display
   Ceiling Light SW

   OK

   Normal conditions listed above are displayed.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [04/2018 - ]  

Result: 

NG 

See step  2

1. Remove the mood switch (roof console box sub-assembly).

   Refer to REMOVAL [04/2018 - ]

2. Inspect the mood switch (roof console box sub-assembly).

   Refer to INSPECTION [04/2018 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE MOOD SWITCH (ROOF CONSOLE BOX SUB-ASSEMBLY). Refer to  REMOVAL [04/2018 - ] 

Result: 

OK 

See step  3

1. Disconnect the G33 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
   O10-27 (+B2) - G33-14 (ILSW)	Always	Below 1 Ω
   O10-27 (+B2) or G33-14 (ILSW) - Body ground	Always	10 kΩ or higher
   O10-15 (GND) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR