DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.4) [TYPE-B (L.H.D.)]

id100270003200

Caution

•  Perform the following malfunction diagnosis only when it is diagnosed with a short between circuits 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

ac5wzw00014755

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 BETWEEN GATEWAY UNIT (GWU) AND DLC-2 FOR SHORT BETWEEN CIRCUITS •  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. •  Inspect for continuity between gateway unit (GWU) terminals 3T and 3S (wiring harness side). •  Is there continuity?	Yes	Repair or replace the wiring harness between gateway unit (GWU) and DLC-2 because the wiring harness is shorted between circuits.
		No	Go to the next step.
2	INSPECT GATEWAY UNIT (GWU) FOR SHORT BETWEEN CIRCUITS •  Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at gateway unit (GWU) terminals 3V and 3U (wiring harness side). •  Is the voltage at gateway unit (GWU) terminals 3V and 3U (wiring harness side) the same?	Yes	Go to the next step.
		No	Replace the gateway unit (GWU) because there is a short between circuits in the gateway unit (GWU). (See GATEWAY UNIT (GWU) REMOVAL/INSTALLATION [TYPE-B].)
3	INSPECT TELEMATICS COMMUNICATION UNIT FOR SHORT BETWEEN CIRCUITS •  Switch the ignition off. •  Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the telematics communication unit connector. •  Inspect for continuity between telematics communication unit terminals 1Q and 1S (wiring harness side). •  Is there continuity?	Yes	Repair or replace the wiring harness between telematics communication unit and gateway unit (GWU) because the wiring harness is shorted between circuits.
		No	Replace the telematics communication unit because there is a short between circuits in the telematics communication unit. (See TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION [TYPE-B].)