Can Communication System (For Hatchback Except Separate Type Yaw Rate Sensor) Check Can Bus Line For Short To +B

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK SHORT TO B+ IN CAN BUS WIRE (DLC3 BRANCH WIRE)

CONNECT CONNECTOR

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR)

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY))

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - AIRBAG SENSOR ASSEMBLY)

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - ECM)

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY))

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - POWER STEERING ECU ASSEMBLY)

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

CHECK SHORT TO B+ IN CAN BUS WIRE (COMBINATION METER ASSEMBLY MAIN WIRE)

CHECK SHORT TO B+ IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE)

CHECK SHORT TO B+ IN CAN BUS WIRE (STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY) BRANCH WIRE)

CHECK SHORT TO B+ IN CAN BUS WIRE (AIRBAG SENSOR ASSEMBLY BRANCH WIRE)

CHECK SHORT TO B+ IN CAN BUS WIRE (ECM MAIN WIRE)

CHECK SHORT TO B+ IN CAN BUS WIRE (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH WIRE)

CHECK SHORT TO B+ IN CAN BUS WIRE (POWER STEERING ECU ASSEMBLY)

CHECK SHORT TO B+ IN CAN BUS WIRE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH WIRE)

CAN COMMUNICATION SYSTEM (for Hatchback except Separate Type Yaw Rate Sensor) - Check CAN Bus Line for Short to +B

DESCRIPTION

There may be a short circuit between the CAN bus lines and +B when the resistance between terminals 6 (CANH) and 16 (BAT) or terminals 14 (CANL) and 16 (BAT) of the DLC3 is below 6 kΩ.

Symptom	Trouble Area
The resistance between terminals 6 (CANH) and 16 (BAT) or terminals 14 (CANL) and 16 (BAT) of the DLC3 is below 6 kΩ.	Short between CAN bus lines and +B ECM Combination meter assembly Airbag sensor assembly Skid control ECU (brake actuator assembly)*1 Main body ECU (multiplex network body ECU) Power steering ECU assembly Steering angle sensor (spiral cable sub-assembly)*2 Air conditioning amplifier assembly No. 1 junction connector No. 2 junction connector

1. *1: w/ ABS
   
2. *2: w/ VSC
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.
   
2. After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
   
3. Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.
   

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

1.CHECK SHORT TO B+ IN CAN BUS WIRE (DLC3 BRANCH WIRE)

1. Turn the ignition switch off.
   

2. Disconnect the A73 and D146 No. 1 junction connectors.
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D102-6 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D102-14 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Front view of DLC3

NG	REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (DLC3 BRANCH WIRE)

OK

2.CONNECT CONNECTOR

1. Reconnect the A73 and D146 No. 1 junction connectors.
   

NEXT

3.CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR)

1. Disconnect the D147 No. 2 junction connector.
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D102-6 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D102-14 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Front view of DLC3

NG	Go to step 8

OK

4.CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D147-7 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D147-18 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 2 Junction Connector)
   *b	Front view of DLC3

NG	Go to step 14

OK

5.CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D147-8 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D147-19 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 2 Junction Connector)
   *b	Front view of DLC3

   Result

   Result	Proceed to
   OK	A
   NG (w/ Cooler)	B
   NG (w/o Cooler)	C

B	Go to step 15
C	REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE)

A

6.CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY))

HINT:

For vehicles without VSC, go to step 7.

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D147-1 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D147-12 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 2 Junction Connector)
   *b	Front view of DLC3

NG	Go to step 16

OK

7.CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - AIRBAG SENSOR ASSEMBLY)

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D147-4 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D147-15 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 2 Junction Connector)
   *b	Front view of DLC3

NG	Go to step 17

OK
REPLACE NO. 2 JUNCTION CONNECTOR

8.CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

1. Disconnect the A73 and D146 No. 1 junction connectors.
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D146-4 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D146-15 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 1 Junction Connector)
   *b	Front view of DLC3

NG	REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

OK

9.CONNECT CONNECTOR

1. Reconnect the D147 No. 2 junction connector.
   

NEXT

10.CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - ECM)

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   A73-9 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   A73-20 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 1 Junction Connector)
   *b	Front view of DLC3

NG	Go to step 18

OK

11.CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY))

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   A73-10 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   A73-21 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 1 Junction Connector)
   *b	Front view of DLC3

NG	Go to step 19

OK

12.CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - POWER STEERING ECU ASSEMBLY)

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D146-2 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D146-13 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 1 Junction Connector)
   *b	Front view of DLC3

NG	Go to step 20

OK

13.CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D146-1 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D146-12 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 1 Junction Connector)
   *b	Front view of DLC3

NG	Go to step 21

OK
REPLACE NO. 1 JUNCTION CONNECTOR

14.CHECK SHORT TO B+ IN CAN BUS WIRE (COMBINATION METER ASSEMBLY MAIN WIRE)

1. Disconnect the D100 combination meter assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D147-7 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D147-18 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 2 Junction Connector)
   *b	Front view of DLC3

NG	REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (COMBINATION METER ASSEMBLY MAIN WIRE)

OK
REPLACE COMBINATION METER ASSEMBLY (YARIS_NCP93 RM0000035EJ00BX.html)

15.CHECK SHORT TO B+ IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE)

1. Disconnect the D130 air conditioning amplifier assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D147-8 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D147-19 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 2 Junction Connector)
   *b	Front view of DLC3

NG	REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE)

OK
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (YARIS_NCP93 RM00000214000EX.html)

16.CHECK SHORT TO B+ IN CAN BUS WIRE (STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY) BRANCH WIRE)

1. Disconnect the D122 steering angle sensor (spiral cable sub-assembly) connector.
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D147-1 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D147-12 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 2 Junction Connector)
   *b	Front view of DLC3

NG	REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY) BRANCH WIRE)

OK
REPLACE STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY) (YARIS_NCP93 RM000000SS905CX.html)

17.CHECK SHORT TO B+ IN CAN BUS WIRE (AIRBAG SENSOR ASSEMBLY BRANCH WIRE)

1. Disconnect the D112 airbag sensor assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D147-4 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D147-15 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 2 Junction Connector)
   *b	Front view of DLC3

NG	REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (AIRBAG SENSOR ASSEMBLY BRANCH WIRE)

OK
REPLACE AIRBAG SENSOR ASSEMBLY (YARIS_NCP93 RM000000V6U02AX.html)

18.CHECK SHORT TO B+ IN CAN BUS WIRE (ECM MAIN WIRE)

1. Disconnect the A72 ECM connector.
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   A73-9 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   A73-20 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 1 Junction Connector)
   *b	Front view of DLC3

NG	REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (ECM MAIN WIRE)

OK
REPLACE ECM (YARIS_NCP93 RM000001CN002IX.html)

19.CHECK SHORT TO B+ IN CAN BUS WIRE (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH WIRE)

1. Disconnect the A70*1 or A71*2 skid control ECU (brake actuator assembly) connector.
   

*1: w/ VSC
*2: w/o VSC

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   A73-10 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   A73-21 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 1 Junction Connector)
   *b	Front view of DLC3

   Result

   Result	Proceed to
   NG	A
   OK (w/ VSC)	B
   OK (w/o VSC)	C

B	REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) (YARIS_NCP93 RM000001BXP02KX.html)
C	REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) (YARIS_NCP93 RM000001BXP02KX.html)

A
REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH WIRE)

20.CHECK SHORT TO B+ IN CAN BUS WIRE (POWER STEERING ECU ASSEMBLY)

1. Disconnect the D104 power steering ECU assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D146-2 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D146-13 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 1 Junction Connector)
   *b	Front view of DLC3

NG	REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (POWER STEERING ECU ASSEMBLY BRANCH WIRE)

OK
REPLACE POWER STEERING ECU ASSEMBLY (YARIS_NCP93 RM000002XN603ZX.html)

21.CHECK SHORT TO B+ IN CAN BUS WIRE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH WIRE)

1. Disconnect the D143 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	Switch Condition	Specified Condition
   D146-1 (CANH) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher
   D146-12 (CANL) - D102-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to No. 1 Junction Connector)
   *b	Front view of DLC3

NG	REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH WIRE)

OK
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (YARIS_NCP93 RM000003TOE00CX.html)