Part 1
NETWORKING: CAN COMMUNICATION SYSTEM: TERMINALS OF ECU
NOTICE:
* After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Service Precautions.
* Turn the power switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.
* Turn the power switch off before inspecting CAN bus lines for a ground short.
* Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.
* This section describes the standard values for all CAN related components.
HINT
* Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
* Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
1. CAN NO. 1 JUNCTION CONNECTOR
(a) Check the CAN No. 1 junction connector (engine room main wire side).
HINT
The following tables contain information about the items and buses connected via junction connectors. The junction connector may be used for multiple separate buses. In this case, the name of the bus will be shown below the name of the item that terminals are connected to. The bus name will be shown in brackets (example: (for Sub bus 12)).
(1) Connection diagram
Text in Illustration
(2) Check the connection diagram of the components which are connected to the CAN No. 1 junction connector.
(b) Check the CAN No. 1 junction connector (instrument panel wire side).
(1) Connection diagram
Text in Illustration
(2) Check the connection diagram of the components which are connected to the CAN No. 1 junction connector.
2. CAN NO. 2 JUNCTION CONNECTOR
(a) Check the CAN No. 2 junction connector (instrument panel connector holder left side).
(1) Connection diagram
Text in Illustration
(2) Check the connection diagram of the components which are connected to the CAN No. 2 junction connector.
(b) Check the CAN No. 2 junction connector (instrument panel connector holder right side).
(1) Connection diagram
Text in Illustration
(2) Check the connection diagram of the components which are connected to the CAN No. 2 junction connector.
*1: for Navigation receiver type
*2: for Radio and display type
3. CAN NO. 3 JUNCTION CONNECTOR
(a) Check the CAN No. 3 junction connector (engine room main wire side).
(1) Connection diagram
Text in Illustration
(2) Check the connection diagram of the components which are connected to the CAN No. 3 junction connector.
(b) Check the CAN No. 3 junction connector (instrument panel wire side).
(1) Connection diagram
Text in Illustration
(2) Check the connection diagram of the components which are connected to the CAN No. 3 junction connector.
4. CAN NO. 4 JUNCTION CONNECTOR (for Sub Bus 11)
(a) Check the CAN No. 4 junction connector.
HINT
Connectors that connect to the CAN junction connector can be distinguished by color of their CAN bus lines. When the connectors have been disconnected from the CAN junction connector, reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.
(1) Connection diagram
Text in Illustration
(b) Check the connection diagram of the components which are connected to the CAN No. 4 junction connector.
Junction Connector A Side
Junction Connector B Side
*1: w/ Advanced parking guidance system
*2: w/ Pre-collision system
*3: w/ Dynamic radar cruise control system
5. CAN NO. 5 JUNCTION CONNECTOR (for Sub Bus 12)
(a) Check the CAN No. 5 junction connector (instrument panel connector holder left side).
(1) Connection diagram
Text in Illustration
(2) Check the connection diagram of the components which are connected to the CAN No. 5 junction connector.
(b) Check the CAN No. 5 junction connector (instrument panel connector holder right side).
(1) Connection diagram
Text in Illustration
(2) Check the connection diagram of the components which are connected to the CAN No. 5 junction connector.
6. DLC3
(a) Measure the resistance according to the value(s) in the table below.
Text in Illustration
Standard Resistance:
7. POWER MANAGEMENT CONTROL ECU
Text in Illustration
(a) Sub Bus 11 Main Lines
(1) Disconnect the power management control ECU connector.
Text in Illustration
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Sub Bus 11 Main Lines
(b) V Bus Branch Lines and Sub Bus 12 Main Lines
(1) Disconnect the power management control ECU connector.
Text in Illustration
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
V Bus Branch Lines
Sub Bus 12 Main Lines
8. ECM
Text in Illustration
(a) Disconnect the ECM connectors.
Text in Illustration
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
V Bus Main Lines
Sub Bus 12 Main Lines
9. TRANSMISSION CONTROL ECU ASSEMBLY
Text in Illustration
(a) Disconnect the transmission control ECU assembly connectors.
Text in Illustration
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
10. BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU)
(a) Disconnect the brake booster with master cylinder assembly (skid control ECU) connector.
Text in Illustration
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
V Bus Branch Lines
Sub Bus 12 Branch Lines
