Interior Light Circuit [12/2019 - 11/2023]: Procedure

1. Perform the Active Test according to the display on the GTS.

   Body Electrical > Main Body > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Illuminated Entry System	Turns on the lights that are controlled by the illuminated entry system*	OFF or ON	Perform the Active Test with the door linked switch of the map light assembly on, switches of the spot light assembly LH and RH off and switch of the No. 1 room light assembly in the DOOR position.

   1. *: Refer to System Description for the lights that are controlled by the illuminated entry system.

      Refer to SYSTEM DESCRIPTION [12/2019 - 11/2023] 

   Body Electrical > Main Body > Active Test 

   Tester Display
   Illuminated Entry System

   OK

   All lights that are controlled by the illuminated entry system come on.

   Result

   Result	Proceed to
   OK	A
   NG (Map light assembly does not come on)	B
   NG (Spot light assembly LH does not come on)	C
   NG (Spot light assembly RH does not come on)	D
   NG (No. 1 room light assembly does not come on)	E
   NG (All lights that are controlled by the illuminated entry system do not come on)	F

Result: 

A 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - 11/2023]  

Result: 

C 

GO TO PROBLEM SYMPTOMS TABLE (SPOT LIGHT ASSEMBLY LH). Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - 11/2023]  

Result: 

D 

GO TO PROBLEM SYMPTOMS TABLE (SPOT LIGHT ASSEMBLY RH). Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - 11/2023]  

Result: 

E 

GO TO PROBLEM SYMPTOMS TABLE (NO. 1 ROOM LIGHT ASSEMBLY). Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - 11/2023]  

Result: 

F 

See step  4

Result: 

B 

See step  2

Refer to INSPECTION [12/2019 - ]

Result

Result: 

NG 

REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

Result: 

OK 

See step  3

1. Disconnect the 4B instrument panel junction block assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R11-10 (+B1) - 4B-10	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Refer to INSPECTION [12/2019 - ]

Result

Result: 

NG 

REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

Result: 

OK 

See step  5

1. Disconnect the 4B instrument panel junction block assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R11-10 (+B1) - 4B-10	Always	Below 1 Ω
   R11-3 (DOOR) - 4B-29	Always	Below 1 Ω
   R11-10 (+B1) or 4B-10 - Body ground	Always	10 kΩ or higher
   R11-3 (DOOR) or 4B-29 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

   Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4B-29 - MB-1 (ILE)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023]