Ambient Illumination Light Circuit [01/2019 - 09/2022]: 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 / Active Test.
5. Perform the Active Test according to the display on the Techstream.

   Body Electrical > Main Body > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Fr Foot Light	Center tray illumination light (Instrument panel light assembly) Cup holder light (Console box pocket garnish)	OFF or ON	Preconditions for using the Active Test to check dimmer controlled illumination: Power switch on (IG) Shift lever is in any position other than P

   Body Electrical > Main Body > Active Test 

   Tester Display
   Fr Foot Light

   Result

   Result	Proceed to
   OK	A
   NG (Center tray illumination light does not come on)	B
   NG (Cup holder light does not come on)	C
   NG (Center tray illumination light and cup holder light does not come on)	D

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

Result: 

C 

See step  6

Result: 

D 

See step  10

Result: 

B 

See step  2

1. Remove the center tray illumination light (instrument panel light assembly).

   Refer to REMOVAL [01/2019 - 11/2022]

2. Inspect the center tray illumination light (instrument panel light assembly).

   Refer to INSPECTION [01/2019 - 11/2022]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE CENTER TRAY ILLUMINATION LIGHT (INSTRUMENT PANEL LIGHT ASSEMBLY). Refer to  REMOVAL [01/2019 - 11/2022] 

Result: 

OK 

See step  3

1. Disconnect the 4E and 4F instrument panel junction block assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I29-2 (B) - 4F-25	Always	Below 1 Ω
   I29-1 (E) - 4E-37	Always	Below 1 Ω
   I29-2 (B) or 4F-25 - Body ground	Always	10 kΩ or higher
   I29-1 (E) or 4E-37 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the 4D 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
   4D-1 - 4F-25	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

Result: 

OK 

See step  5

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 [01/2019 - 03/2019] , or refer to REMOVAL [03/2019 - 09/2022]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4E-37 -MB-26 (FSPT)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

1. Remove the cup holder light (console box pocket garnish).

   Refer to REMOVAL [01/2019 - 11/2022]

2. Inspect the cup holder light (console box pocket garnish).

   Refer to INSPECTION [01/2019 - 11/2022]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE CUP HOLDER LIGHT (CONSOLE BOX POCKET GARNISH). Refer to  REMOVAL [01/2019 - 11/2022] 

Result: 

OK 

See step  7

1. Disconnect the 4E and 4F instrument panel junction block assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I30-2 (B) - 4F-26	Always	Below 1 Ω
   I30-1 (E) - 4E-36	Always	Below 1 Ω
   I30-2 (B) or 4F-26 - Body ground	Always	10 kΩ or higher
   I30-1 (E) or 4E-36 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the 4D 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
   4D-1 - 4F-26	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

Result: 

OK 

See step  9

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 [01/2019 - 03/2019] , or refer to REMOVAL [03/2019 - 09/2022]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4E-36 -MB-26 (FSPT)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   4D-1 - Body ground	Power switch off	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  11

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the 4F 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
   4D-1 - 4F-25	Always	Below 1 Ω
   4D-1 - 4F-26	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

Result: 

OK 

See step  12

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 [01/2019 - 03/2019] , or refer to REMOVAL [03/2019 - 09/2022]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4E-36 -MB-26 (FSPT)	Always	Below 1 Ω
   4E-37 -MB-26 (FSPT)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022]