DTC Code | DTC Name |
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Main Body ECU Communication Stop Mode |
DESCRIPTION
Detection Item | Symptom | Trouble Area |
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Main Body ECU Communication Stop Mode | Either condition is met:
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CAUTION / NOTICE / HINT
Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
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 (Click here).
Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output (Click here).
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the power switch on (IG), turn the blind spot monitor main switch on and wait at least 20 seconds.
After the repair, perform CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed (Click here).
If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.
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.
PROCEDURE
CHECK FOR OPEN IN CAN BUS LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH LINE)
Disconnect the cable from the negative (-) auxiliary battery terminal.
Disconnect the H10 main body ECU (multiplex network body ECU) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
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*a | Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU)) |
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
Disconnect the 3B instrument panel junction block assembly connector.
Disconnect the 3D instrument panel junction block assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
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Reconnect the cable to the negative (-) auxiliary battery terminal.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
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*a | Front view of wire harness connector (to Instrument Panel Junction Block Assembly) |
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 NO.2 RELAY AND ACC NO. 1 RELAY)
Remove the instrument panel junction block assembly (Click here).
Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
Measure the resistance according to the value(s) in the table below.
*a | Component without harness connected (Instrument Panel Junction Block Assembly) |
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Standard Resistance | |||||||||||||||
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REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (Click here)