Toyota CH-R Service Manual: Check Bus 2 Lines for Short Circuit

NOTICE:

• 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.

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• Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
• After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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• After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  DTC check procedure: Turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch), turn the cruise control main switch on, turn the LDA main switch on and then drive the vehicle at a speed of 60 km/h (37 mph) or more for approximately 5 minutes or more.

• After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

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• Before replacing the ECM, refer to Registration.*1

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• *1: w/ Smart Key System

HINT:

• Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
• When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

Open in One Side of Bus 1 Branch Line

DESCRIPTION When the CAN bus main lines are normal (no open, short to ground, short to +B or short between lines) and there is an ECU or sensor on the "Communication Bus Check" screen t ...

Open in Bus 2 Main Bus Line

DESCRIPTION There may be an open circuit in one of the CAN main bus lines when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is 70 Ω o ...

Other materials:

Toyota CH-R Service Manual > Safety Connect System: Ignition Switch Signal Malfunction (B15C6)
DESCRIPTION If vehicle movement (10 km/h (6 mph) or more for 10 seconds) is detected based on the location data sent from the radio receiver assembly even when the telematics transceiver detects that the ignition switch is off, this DTC will be stored. DTC No. Detection I ...

Toyota CH-R Service Manual > Blind Spot Monitor System: Yaw Rate Sensor (C1A46)
DESCRIPTION The blind spot monitor sensor receives yaw rate signals from the airbag sensor assembly via CAN communication. DTC No. Detection Item DTC Detection Condition Trouble Area C1A46 Yaw Rate Sensor A fail f ...