Main Body ECU Communication Stop Mode

NETWORKING: CAN COMMUNICATION SYSTEM: Main Body ECU Communication Stop Mode
- Main Body ECU Communication Stop Mode

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
* Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
* Turn the ignition switch off before inspecting CAN bus wires for a ground short.
* After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
* 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 any doors need to be opened in order to check connectors, open the doors and leave them open.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
* Operating the ignition 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.

PROCEDURE

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization

NEXT -- Continue to next step.

2. CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU BRANCH WIRE)

(a) Turn the ignition switch off.

(b) Disconnect the D13 main body ECU connector.

Text in Illustration

(d) Reconnect the main body ECU connector.

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MAIN BODY ECU (CAN-H, CAN-L)
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (IG SW)

(a) Connect the cable to the negative (-) battery terminal.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON and turn the Techstream on.

(d) Enter the following menus: Body / Main Body / Data List / IG SW Scan Tool Testing and Procedures.

(e) Read the value displayed on the Techstream.

Body / Main Body / Data List

OK:

Ignition switch condition is displayed correctly.

NG -- CHECK HARNESS AND CONNECTOR (JUNCTION BLOCK POWER SOURCE)

OK -- REPLACE MAIN BODY ECU Removal

4. CHECK HARNESS AND CONNECTOR (JUNCTION BLOCK POWER SOURCE)

(a) Disconnect the 2D and 2K instrument panel block connectors.

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

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. REPLACE MAIN BODY ECU

(a) Replace the main body ECU with a new or normal one Removal.

OK:

The vehicle is returned to its normal condition and operates normally.

NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Removal

OK -- END