DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.3) [TYPE-B (R.H.D.)]


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Caution
•  Perform the following malfunction diagnosis only when it is diagnosed with a short to ground by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [TYPE-B (R.H.D.)]. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [TYPE-B (R.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 BETWEEN GATEWAY UNIT (GWU) AND DLC-2 FOR SHORT BETWEEN CIRCUITS
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  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
•  Disconnect the connector 4 which has gateway unit (GWU) terminals 4R and 4Q.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at gateway unit (GWU) terminals 4R and 4Q (wiring harness side).
•  Is the voltage at gateway unit (GWU) terminals 4R and 4Q (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).
3
INSPECT BETWEEN GATEWAY UNIT (GWU) AND CONNECTOR C-13 FOR SHORT BETWEEN CIRCUITS
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Disconnect the connector C-13.
•  Connect the connector 3 which has gateway unit (GWU) terminals 3T and 3S.
•  Connect the connector 4 which has gateway unit (GWU) terminals 4R and 4Q.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage at DLC-2 terminals F and E the same?
Yes
Repair or replace the wiring harness between gateway unit (GWU) and connector C-13 because the wiring harness is shorted between circuits.
No
Go to the next step.
4
INSPECT BETWEEN CONNECTOR C-13 AND CONNECTORS C-74, C-75 FOR SHORT BETWEEN CIRCUITS
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Disconnect the connectors C-74, C-75.
•  Connect the connector C-13.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage at DLC-2 terminals F and E the same?
Yes
Repair or replace the wiring harness between connector C-13 and connectors C-74, C-75 because the wiring harness is shorted between circuits.
No
Go to the next step.
5
INSPECT BETWEEN AUDIO AMPLIFIER AND CONNECTORS C-74, C-75 FOR SHORT BETWEEN CIRCUITS
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Inspect for continuity between audio amplifier terminals 1N and 1M. (with Bose® type audio)
•  Inspect for continuity between audio amplifier terminals 1Q and 1S. (without Bose® type audio)
•  Is there continuity?
Yes
Go to the next step.
No
Go to Step 7.
6
INSPECT AUDIO AMPLIFIER FOR SHORT BETWEEN CIRCUITS
•  Disconnect the audio amplifier connector.
•  Inspect for continuity between audio amplifier terminals 1N and 1M (wiring harness side). (with Bose® type audio)
•  Inspect for continuity between audio amplifier terminals 1Q and 1S (wiring harness side). (without Bose® type audio)
•  Is there continuity?
Yes
Repair or replace the wiring harness between the audio amplifier and connectors C-74, C-75 because the wiring harness is shorted between circuits.
No
Replace the audio amplifier because there is a short between circuits in the audio amplifier.
7
INSPECT BETWEEN 360° VIEW MONITOR CONTROL MODULE AND CONNECTORS C-74, C-75 FOR SHORT BETWEEN CIRCUITS
•  Inspect for continuity between 360° view monitor control module terminals 1C and 1A.
•  Is there continuity?
Yes
Go to the next step.
No
Go to Step 9.
8
INSPECT 360° VIEW MONITOR CONTROL MODULE FOR SHORT BETWEEN CIRCUITS
•  Disconnect the audio 360° view monitor control module.
•  Inspect for continuity between 360° view monitor control module terminals 1C and 1A (wiring harness side).
•  Is there continuity?
Yes
Repair or replace the wiring harness between the 360° view monitor control module and connectors C-74, C-75 because the wiring harness is shorted between circuits.
No
Replace the 360° view monitor control module because there is a short between circuits in the 360° view monitor control module.
9
INSPECT BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND CONNECTOR C-13 FOR SHORT BETWEEN CIRCUITS
•  Disconnect the connector C-13.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at connectivity master unit (CMU) terminals 1Q and 1O (wiring harness side).
•  Is the voltage at connectivity master unit (CMU) terminals 1Q and 1O (wiring harness side) the same?
Yes
Go to the next step.
No
Repair or replace the wiring harness between connectors C-74, C-75 and connector C-13 because the wiring harness is shorted between circuits.
10
INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR SHORT BETWEEN CIRCUITS
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Disconnect the connectivity master unit (CMU).
•  Inspect for continuity between connectivity master unit (CMU) terminals 1Q and 1O (wiring harness side).
•  Is there continuity?
Yes
Repair or replace the wiring harness between connectivity master unit (CMU) and connector C-13 because the wiring harness is shorted between circuits.
No
Replace the connectivity master unit (CMU) because there is a short between circuits in the connectivity master unit (CMU).