DTC B1206: P/W Master Switch Communication Stop; DTC B1273: Sliding Roof ECU Communication Stop; DTC B2321: D-Door Motor ECU Communication Stop; DTC B2322: P-Door Motor ECU Communication Stop; DTC B2323: RR-Door Motor ECU Communication Stop; DTC B2324: RL-Door Motor ECU Communication Stop; DTC B2329: Lost Communication with Sliding Sunshade ECU [12/2019 - 11/2023]: Procedure

1. Clear the DTCs.

   Body Electrical > Main Body > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Check for DTCs.

   Body Electrical > Main Body > Trouble Codes 

   Result

   Result	Proceed to
   DTC is not output	A
   DTC B1206, B1273*1*2, B2321, B2322, B2323, B2324 and B2329*2 are output	B
   DTC B1206, B1273*1*2, B2321, B2322 and B2329*2 are output	C
   DTC B2323 and B2324 are output	D
   Only DTC B1206 and B2321 are output	E
   Only DTC B1206 is output	F
   Only DTC B1273 is output*1*2	G
   Only DTC B2321 is output	H
   Only DTC B2322 is output	I
   Only DTC B2323 is output	J
   Only DTC B2324 is output	K
   Only DTC B1273 and B2329 are output*2	L
   Only DTC B2329 is output*2	M

   1. *1: w/ Sliding Roof System
   2. *2: w/ Panoramic Moon Roof System

Result: 

A 

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

Result: 

C 

See step  4

Result: 

D 

See step  6

Result: 

E 

See step  8

Result: 

F 

See step  9

Result: 

G 

See step  10

Result: 

H 

See step  12

Result: 

I 

See step  15

Result: 

J 

See step  17

Result: 

K 

See step  19

Result: 

L 

See step  21

Result: 

M 

See step  22

Result: 

B 

See step  3

1. Remove the instrument panel junction block assembly.

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   HINT: 

   This inspection is to check the LIN communication line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   MB-16 (LIN2) - 4B-17 or 4D-25	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] 

1. Remove the instrument panel junction block assembly.

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   HINT: 

   This inspection is to check the LIN communication line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   MB-16 (LIN2) - 4B-17	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

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

Result: 

OK 

See step  5

1. Disconnect the J18 multiplex network master switch assembly connector.
2. Measure the resistance according to the value(s) in the table below.
   NOTE:

   Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4B-17 - J18-17 (LIN1)	Ignition switch off	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 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the instrument panel junction block assembly.

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   HINT: 

   This inspection is to check the LIN communication line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   MB-16 (LIN2) - 4D-25	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

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

Result: 

OK 

See step  7

1. Disconnect the K9 power window regulator motor assembly (rear LH door) connector.
2. Measure the resistance according to the value(s) in the table below.
   NOTE:

   Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4D-25 - K9-9 (LIN)	Ignition switch off	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 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the 4B instrument panel junction block assembly connector.
2. Disconnect the J18 multiplex network master switch assembly connector.
3. Measure the resistance according to the value(s) in the table below.
   NOTE:

   Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4B-17 - J18-17 (LIN1)	Ignition switch off	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   J18-11 (B) - J18-12 (GND)	Ignition switch off*1 Always*2	11 to 14 V

   1. *1: for HV Model
   2. *2: for Gasoline Model
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J18-12 (GND) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the 4B instrument panel junction block assembly connector.
2. Disconnect the R2*1 or R19*2 sliding roof ECU (sliding roof drive gear assembly) connector.
   1. *1: w/ Sliding Roof System
   2. *2: w/ Panoramic Moon Roof System
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   W/ SLIDING ROOF SYSTEM
   
   

   Tester Connection	Condition	Specified Condition
   4B-17 - R2-7 (MPX1)	Ignition switch off	Below 1 Ω

   W/ PANORAMIC MOON ROOF SYSTEM
   
   

   Tester Connection	Condition	Specified Condition
   4B-17 - R19-11 (MPX1)	Ignition switch off	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  11

1. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   W/ SLIDING ROOF SYSTEM
   
   

   Tester Connection	Condition	Specified Condition
   R2-1 (B) - R2-2 (E)	Ignition switch off*1 Always*2	11 to 14 V

   W/ PANORAMIC MOON ROOF SYSTEM
   
   

   Tester Connection	Condition	Specified Condition
   R19-8 (B) - R19-12 (E)	Ignition switch off*1 Always*2	11 to 14 V

   1. *1: for HV Model
   2. *2: for Gasoline Model
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   W/ SLIDING ROOF SYSTEM
   
   

   Tester Connection	Condition	Specified Condition
   R2-2 (E) - Body ground	Always	Below 1 Ω

   W/ PANORAMIC MOON ROOF SYSTEM
   
   

   Tester Connection	Condition	Specified Condition
   R19-12 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) 

w/ Sliding Roof System: Refer to DISASSEMBLY [12/2019 - ]

w/ Panoramic Moon Roof System: Refer to DISASSEMBLY [12/2019 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the multiplex network master switch assembly.

   Refer to INSPECTION [12/2019 - ]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Multiplex Network Master Switch Assembly)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   16 - 17	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

Result: 

OK 

See step  13

1. Disconnect the J24 power window regulator motor assembly (driver door) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J18-16 (LIN2) - J24-9 (LIN)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  14

1. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   J24-2 (B) - J24-1 (GND)	Ignition switch off*1 Always*2	11 to 14 V

   1. *1: for HV Model
   2. *2: for Gasoline Model
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J24-1 (GND) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (DRIVER DOOR). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the 4B instrument panel junction block assembly connector.
2. Disconnect the J8 power window regulator motor assembly (front passenger door) connector.
3. Measure the resistance according to the value(s) in the table below.
   NOTE:

   Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4B-17 - J8-9 (LIN)	Ignition switch off	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  16

1. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   J8-2 (B) - J8-1 (GND)	Ignition switch off*1 Always*2	11 to 14 V

   1. *1: for HV Model
   2. *2: for Gasoline Model
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J8-1 (GND) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (FRONT PASSENGER DOOR). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the 4D instrument panel junction block assembly connector.
2. Disconnect the K4 power window regulator motor assembly (rear RH door) connector.
3. Measure the resistance according to the value(s) in the table below.
   NOTE:

   Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4D-25 - K4-9 (LIN)	Ignition switch off	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  18

1. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   K4-2 (B) - K4-1 (GND)	Ignition switch off*1 Always*2	11 to 14 V

   1. *1: for HV Model
   2. *2: for Gasoline Model
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K4-1 (GND) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR RH DOOR). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the 4D instrument panel junction block assembly connector.
2. Disconnect the K9 power window regulator motor assembly (rear LH door) connector.
3. Measure the resistance according to the value(s) in the table below.
   NOTE:

   Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4D-25 - K9-9 (LIN)	Ignition switch off	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  20

1. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   K9-2 (B) - K9-1 (GND)	Ignition switch off*1 Always*2	11 to 14 V

   1. *1: for HV Model
   2. *2: for Gasoline Model
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K9-1 (GND) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR LH DOOR). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the 4B instrument panel junction block assembly connector.
2. Disconnect the R19 sliding roof ECU (sliding roof drive gear assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4B-17 - R19-11 (MPX1)	Ignition switch off	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 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the 4B instrument panel junction block assembly connector.
2. Disconnect the R20 roof sunshade ECU (sliding roof drive gear assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4B-17 - R20-11 (MPX1)	Ignition switch off	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  23

1. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   R20-8 (B) - R20-12 (E)	Ignition switch off*1 Always*2	11 to 14 V

   1. *1: for HV Model
   2. *2: for Gasoline Model
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R20-12 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ROOF SUNSHADE ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY). Refer to  DISASSEMBLY [12/2019 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR