DTC U1002: Lost Communication with Gateway Module (Main Body ECU) [09/2017 - 05/2019]: Procedure

CHECK SUB BUS 1

Disconnect the cable from the negative (-) battery terminal.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Component with harness connected (Main Body ECU [Multiplex Network Body ECU])
*b	Front view of DLC3

Standard Resistance

Tester Connection	Condition	Specified Condition	Result
I47-9 (CANP) - I47-10 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω	Below 54 Ω: Short circuit between bus lines
I47-9 (CANP) - I47-10 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω	70 Ω or higher: Open circuit in main bus lines
I47-9 (CANP) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short
I47-10 (CANN) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short
I47-9 (CANP) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
I47-10 (CANN) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

Result

Result	Proceed to
OK	A
Open circuit in CAN main bus lines	B
Between Lines	C
+B short Ground short	D

Result:

See step 3

Result:

See step 12

Result:

See step 21

Result:

See step 2

CHECK FOR DTC OUTPUT

Reconnect the cable to the negative (-) battery terminal.
Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Clear the DTCs.
Body Electrical > Main Body > Clear DTCs
Turn the engine switch off.
Turn the engine switch on (IG).

Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Result	Proceed to
DTC U1002 is not output from main body ECU (multiplex network body ECU) (Techstream display: Main Body)	A
DTC U1002 is output from main body ECU (multiplex network body ECU) (Techstream display: Main Body)	B

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2017 - 05/2019]

Result:

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL [10/2014 - 05/2019]

CHECK FOR OPEN IN CAN BUS WIRE (NO. 5 CAN JUNCTION CONNECTOR)

Disconnect the No. 5 CAN junction connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Rear view of wire harness connector (to No. 5 CAN Junction Connector)
*b	to No. 7 CAN Junction Connector
*c	to No. 4 CAN Junction Connector

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
I97-5 (CANH) - I97-16 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 7 CAN junction connector
I97-6 (CANH) - I97-17 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 4 CAN junction connector

Result

Result	Proceed to
OK	A
NG (No. 7 CAN junction connector CAN main wire)	B
NG (No. 4 CAN junction connector CAN main wire)	C

Result:

REPLACE NO. 5 CAN JUNCTION CONNECTOR

Result:

See step 8

Result:

See step 4

CONNECT CONNECTOR

Connect the I97 No. 5 CAN junction connector.

Result

Proceed to
Next

Result:

See step 5

CHECK FOR OPEN IN CAN BUS WIRE (NO. 7 CAN JUNCTION CONNECTOR)

Disconnect the No. 7 CAN junction connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Rear view of wire harness connector (to No. 7 CAN Junction Connector)
*b	to No. 5 CAN Junction Connector
*c	to No. 2 CAN Junction Terminal

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
Y22-5 (CANH) - Y22-16 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 5 CAN junction connector
Y22-7 (CANH) - Y22-18 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 2 CAN junction terminal

Result

Result	Proceed to
OK	A
NG (No. 2 CAN junction terminal CAN main wire)	B
NG (No. 5 CAN junction connector CAN main wire)	C

Result:

REPLACE NO. 7 CAN JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

Result:

See step 6

CONNECT CONNECTOR

Connect the Y22 No. 7 CAN junction connector.

Result

Proceed to
Next

Result:

See step 7

CHECK FOR OPEN IN CAN BUS WIRE (NO. 2 CAN JUNCTION TERMINAL - NO. 7 CAN JUNCTION CONNECTOR)

Disconnect the No. 2 CAN junction terminal connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Rear view of wire harness connector (to No. 2 CAN Junction Terminal)

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

Standard Resistance

Tester Connection	Condition	Specified Condition
Y23-3 (CANH) - Y23-2 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Result

Proceed to
OK
NG

Result:

REPLACE NO. 2 CAN JUNCTION TERMINAL

Result:

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 2 CAN JUNCTION TERMINAL - NO. 7 CAN JUNCTION CONNECTOR)

CONNECT CONNECTOR

Connect the I97 No. 5 CAN junction connector.

Result

Proceed to
Next

Result:

See step 9

CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 CAN JUNCTION CONNECTOR)

Disconnect the No. 4 CAN junction connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Rear view of wire harness connector (to No. 4 CAN Junction Connector)
*b	to Main Body ECU (Multiplex Network Body ECU)
*c	to No. 5 CAN Junction Connector

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
I96-4 (CANH) - I96-15 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Main body ECU (multiplex network body ECU)
I96-7 (CANH) - I96-18 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 5 CAN junction connector

Result

Result	Proceed to
OK	A
NG (Main body ECU [multiplex network ECU] CAN main wire)	B
NG (No. 5 CAN junction connector CAN main wire)	C

Result:

REPLACE NO. 4 CAN JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

Result:

See step 10

CONNECT CONNECTOR

Connect the I96 No. 4 CAN junction connector.

Result

Proceed to
Next

Result:

See step 11

CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 4 CAN JUNCTION CONNECTOR)

Disconnect the main body ECU (multiplex network body ECU) connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Rear view of wire harness connector (to Main Body ECU [Multiplex Network Body ECU])

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

Standard Resistance

Tester Connection	Condition	Specified Condition
I47-9 (CANP) - I47-10 (CANN)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Result

Proceed to
OK
NG

Result:

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL [10/2014 - 05/2019]

Result:

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 4 CAN JUNCTION CONNECTOR)

CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 CAN JUNCTION CONNECTOR)

Disconnect the No. 5 CAN junction connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Rear view of wire harness connector (to No. 5 CAN Junction Connector)
*b	to Multiplex Tilt and Telescopic ECU (for Power Tilt and Power Telescopic Steering Column)
*c	to No. 7 CAN Junction Connector
*d	to No. 4 CAN Junction Connector
*e	to Front Power Seat Switch (for Driver Side) (w/ Memory)
*f	to Outer Mirror Control ECU Assembly LH (w/ Memory)

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
I97-4 (CANH) - I97-15 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Multiplex tilt and telescopic ECU*1
I97-5 (CANH) - I97-16 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 7 CAN junction connector
I97-6 (CANH) - I97-17 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 4 CAN junction connector
I97-7 (CANH) - I97-18 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Front power seat switch (for driver side)*2
I97-8 (CANH) - I97-19 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Outer mirror control ECU assembly LH*2

⁽⁾	1: for Power Tilt and Power Telescopic Steering Column2: w/ Memory

Result

Result	Proceed to
OK	A
NG (No. 7 CAN junction connector CAN main wire)	B
NG (No. 4 CAN junction connector CAN main wire)	C
NG (Wire to ECU or sensor)	D

Result:

REPLACE NO. 5 CAN JUNCTION CONNECTOR

Result:

See step 17

Result:

See step 28

Result:

See step 13

CONNECT CONNECTOR

Connect the I97 No. 5 CAN junction connector.

Result

Proceed to
Next

Result:

See step 14

CHECK FOR SHORT IN CAN BUS WIRES (NO. 7 CAN JUNCTION CONNECTOR)

Disconnect the No. 7 CAN junction connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Rear view of wire harness connector (to No. 7 CAN Junction Connector)
*b	to No. 5 CAN Junction Connector
*c	to Multiplex Network Door ECU (w/ Power Back Door System)
*d	to No. 2 CAN Junction Terminal

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
Y22-5 (CANH) - Y22-16 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 5 CAN junction connector
Y22-6 (CANH) - Y22-17 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Multiplex network door ECU*
Y22-7 (CANH) - Y22-18 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 2 CAN junction terminal

⁽⁾	*: w/ Power Back Door System

Result

Result	Proceed to
OK	A
NG (No. 2 CAN junction terminal CAN main wire)	B
NG (No. 5 CAN junction connector CAN main wire)	C
NG (Wire to ECU or sensor)	D

Result:

REPLACE NO. 7 CAN JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

Result:

See step 28

Result:

See step 15

CONNECT CONNECTOR

Connect the Y22 No. 7 CAN junction connector.

Result

Proceed to
Next

Result:

See step 16

CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 CAN JUNCTION TERMINAL - NO. 7 CAN JUNCTION CONNECTOR)

Disconnect the No. 2 CAN junction terminal connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Rear view of wire harness connector (to No. 2 CAN Junction Terminal)

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

Standard Resistance

Tester Connection	Condition	Specified Condition
Y23-3 (CANH) - Y23-2 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Result

Proceed to
OK
NG

Result:

REPLACE NO. 2 CAN JUNCTION TERMINAL

Result:

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 2 CAN JUNCTION TERMINAL - NO. 7 CAN JUNCTION CONNECTOR)

CONNECT CONNECTOR

Connect the I97 No. 5 CAN junction connector.

Result

Proceed to
Next

Result:

See step 18

CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 CAN JUNCTION CONNECTOR)

Disconnect the No. 4 CAN junction connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Rear view of wire harness connector (to No. 4 CAN Junction Connector)
*b	to Main Body ECU (Multiplex Network Body ECU)
*c	to Outer Mirror Control ECU Assembly RH (w/ Memory)
*d	to No. 5 CAN Junction Connector

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
I96-4 (CANH) - I96-15 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Main body ECU (multiplex network body ECU)
I96-5 (CANH) - I96-16 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Outer mirror control ECU assembly RH*
I96-7 (CANH) - I96-18 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 5 CAN junction connector

⁽⁾	*: w/ Memory

Result

Result	Proceed to
OK	A
NG (Main body ECU [multiplex network body ECU] CAN main wire)	B
NG (No. 5 CAN junction connector CAN main wire)	C
NG (Wire to ECU or sensor)	D

Result:

REPLACE NO. 4 CAN JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

Result:

See step 28

Result:

See step 19

CONNECT CONNECTOR

Connect the I96 No. 4 CAN junction connector.

Result

Proceed to
Next

Result:

See step 20

CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 4 CAN JUNCTION CONNECTOR)

Disconnect the main body ECU (multiplex network body ECU) connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Rear view of wire harness connector (to Main Body ECU [Multiplex Network Body ECU])

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

Standard Resistance

Tester Connection	Condition	Specified Condition
I47-9 (CANP) - I47-10 (CANN)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Result

Proceed to
OK
NG

Result:

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL [10/2014 - 05/2019]

Result:

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 4 CAN JUNCTION CONNECTOR)

CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 CAN JUNCTION CONNECTOR)

Disconnect the No. 5 CAN junction connector.

*a	Rear view of wire harness connector (to No. 5 CAN Junction Connector)	*b	Front view of DLC3
*c	to Multiplex Tilt and Telescopic ECU (for Power Tilt and Power Telescopic Steering Column)	*d	to No. 7 CAN Junction Connector
*e	to No. 4 CAN Junction Connector	*f	to Front Power Seat Switch (for Driver Side) (w/ Memory)
*g	to Outer Mirror Control ECU Assembly LH (w/ Memory)	-	-

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
I97-4 (CANH) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Multiplex Tilt and Telescopic ECU*1
I97-15 (CANL) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
I97-4 (CANH) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I97-15 (CANL) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I97-5 (CANH) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	No. 7 CAN junction connector
I97-16 (CANL) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
I97-5 (CANH) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I97-16 (CANL) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I97-6 (CANH) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	No. 4 CAN junction connector
I97-17 (CANL) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
I97-6 (CANH) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I97-17 (CANL) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I97-7 (CANH) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Front power seat switch (for driver side)*2
I97-18 (CANL) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
I97-7 (CANH) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I97-18 (CANL) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I97-8 (CANH) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Outer mirror control ECU assembly LH*2
I97-19 (CANL) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
I97-8 (CANH) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I97-19 (CANL) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher

⁽⁾	1: for Power Tilt and Power Telescopic Steering Column2: w/ Memory

Result

Result	Proceed to
OK	A
NG (No. 7 CAN junction connector CAN main wire)	B
NG (No. 4 CAN junction connector CAN main wire)	C
NG (Wire to ECU or sensor)	D

Result:

REPLACE NO. 5 CAN JUNCTION CONNECTOR

Result:

See step 24

Result:

See step 28

Result:

See step 22

CONNECT CONNECTOR

Connect the I97 No. 5 CAN junction connector.

Result

Proceed to
Next

Result:

See step 23

CHECK FOR SHORT IN CAN BUS WIRES (NO. 7 CAN JUNCTION CONNECTOR)

Disconnect the No. 7 CAN junction connector.

*a	Rear view of wire harness connector (to No. 7 CAN Junction Connector)	*b	Front view of DLC3
*c	to No. 5 CAN Junction Connector	*d	to Multiplex Network Door ECU (w/ Power Back Door System)
*e	to No. 2 CAN Junction Terminal	-	-

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
Y22-5 (CANH) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	No. 5 CAN junction connector
Y22-16 (CANL) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
Y22-5 (CANH) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
Y22-16 (CANL) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
Y22-6 (CANH) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Multiplex network door ECU*
Y22-17 (CANL) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
Y22-6 (CANH) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
Y22-17 (CANL) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
Y22-6 (CANH) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	No. 2 CAN junction terminal
Y22-17 (CANL) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
Y22-6 (CANH) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
Y22-17 (CANL) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher

⁽⁾	*: w/ Power Back Door System

Result

Result	Proceed to
OK	A
NG (No. 5 CAN junction connector CAN main wire)	B
NG (Wire to ECU or sensor)	C

Result:

REPLACE NO. 5 CAN JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

Result:

See step 28

CONNECT CONNECTOR

Connect the I97 No. 5 CAN junction connector.

Result

Proceed to
Next

Result:

See step 25

CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 CAN JUNCTION CONNECTOR)

Disconnect the No. 4 CAN junction connector.

*a	Rear view of wire harness connector (to No. 4 CAN Junction Connector)	*b	Front view of DLC3
*c	to Main Body ECU (Multiplex Network Body ECU)	*d	to Outer Mirror Control ECU Assembly RH (w/ Memory)
*e	to No. 5 CAN Junction Connector	-	-

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
I96-4 (CANH) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Main body ECU (multiplex network body ECU)
I96-15 (CANL) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
I96-4 (CANH) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I96-15 (CANL) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I96-5 (CANH) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Outer mirror control ECU assembly RH*
I96-16 (CANL) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
I96-5 (CANH) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I96-16 (CANL) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I96-7 (CANH) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	No. 5 CAN junction connector
I96-18 (CANL) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
I96-7 (CANH) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I96-18 (CANL) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher

⁽⁾	*: w/ Memory

Result

Result	Proceed to
OK	A
NG (No. 5 CAN junction connector CAN main wire)	B
NG (Main body ECU [multiplex network body ECU] CAN main wire)	C
NG (Wire to ECU or sensor)	D

Result:

REPLACE NO. 4 CAN JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

Result:

See step 28

Result:

See step 26

CONNECT CONNECTOR

Connect the I96 No. 4 CAN junction connector.

Result

Proceed to
Next

Result:

See step 27

CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)

Disconnect the main body ECU (multiplex network body ECU) connector.

*a	Rear view of wire harness connector (to Main Body ECU [Multiplex Network Body ECU])
*b	Front view of DLC3

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

Standard Resistance

Tester Connection	Condition	Specified Condition
I47-9 (CANP) - I7-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
I47-10 (CANN) - I7-4 (CG)		200 Ω or higher
I47-9 (CANP) - I7-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
I47-10 (CANN) - I7-16 (BAT)		6 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL [10/2014 - 05/2019]

Result:

REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO MAIN BODY ECU (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 4 CAN JUNCTION CONNECTOR)

CHECK SHORT IN CAN BUS WIRES

Reconnect all wire harness connectors.

Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited branch line, +B or GND is connected.

*a	Component with harness connected (Main Body ECU [Multiplex Network Body ECU])
*b	Front view of DLC3

Standard Resistance

Tester Connection	Condition	Specified Condition
I47-9 (CANP) - I47-10 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω
I47-9 (CANP) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I47-10 (CANN) - I7-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
I47-9 (CANP) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
I47-10 (CANN) - I7-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher

HINT:

If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor
If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
If the resistance changes to 200 Ω or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

Result

Proceed to
OK
NG

Result:

REPLACE CORRESPONDING ECU OR SENSOR

Result:

REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BUS LINES OR CONNECTOR