DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.4) [TYPE-B (L.H.D.)]

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Caution

•  Perform the following malfunction diagnosis only when it is diagnosed with a short to power supply by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [TYPE-B (L.H.D.)]. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [TYPE-B (L.H.D.)].)

System Wiring Diagram

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Determination Procedure

Caution

•  When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.

•  When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.

•  Disconnect the negative battery terminal before performing any work that requires handling of connectors.

Step	Inspection		Action
1	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN GATEWAY UNIT (GWU) AND DLC-2 •  Switch the ignition off. •  Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector 3 which has gateway unit (GWU) terminals 3T and 3S. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at DLC-2 terminals F and E. •  Is the voltage 0 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the DLC-2 and gateway unit (GWU) because the wiring harness is shorted to the power supply.
2	INSPECT CAN LINE BETWEEN GATEWAY UNIT (GWU) AND TELEMATICS COMMUNICATION UNIT FOR SHORT TO POWER SUPPLY •  Measure the voltage at gateway unit (GWU) terminals 3V and 3U (wiring harness side). •  Is the voltage between 1.5—3.5 V?	Yes	Replace the gateway unit (GWU) because there is a short to the power supply in the gateway unit (GWU). (See GATEWAY UNIT (GWU) REMOVAL/INSTALLATION [TYPE-B].)
		No	Go to the next step.
3	INSPECT TELEMATICS COMMUNICATION UNIT FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the telematics communication unit connector. •  Connect the connector 3 which has gateway unit (GWU) terminals 3V and 3U. •  Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at DLC-2 terminals F and E. •  Is the voltage between 1.5 — 3.5 V?	Yes	Replace the telematics communication unit because there is a short to the power supply in the telematics communication unit. (See TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION [TYPE-B].)
		No	Repair or replace the wiring harness between the telematics communication unit and gateway unit (GWU) because the wiring harness is shorted to the power supply.