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

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Caution

•  Perform the following malfunction diagnosis only when it is diagnosed with a short between circuits by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [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 lead-acid battery terminal before performing any work that requires handling of connectors.

Step	Inspection		Action
1	INSPECT BODY CONTROL MODULE (BCM) FOR SHORT BETWEEN CIRCUITS •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector 2 which has body control module (BCM) terminals 2D and 2B. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2D and 2B (wiring harness side). •  Is the voltage at body control module (BCM) terminals 2D and 2B (wiring harness side) the same?	Yes	Go to the next step.
		No	Replace the body control module (BCM) because there is a short between circuits in the body control module (BCM). (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
2	INSPECT CAN LINE BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTOR C-09 FOR SHORT BETWEEN CIRCUITS •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-09. •  Connect the connector 2 which has body control module (BCM) terminals 2D and 2B. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2D and 2B. •  Is the voltage at body control module (BCM) terminals 2D and 2B the same?	Yes	Repair or replace the wiring harness between the body control module (BCM) and connector C-09 because the wiring harness is shorted between circuits.
		No	Go to the next step.
3	INSPECT CAN LINE BETWEEN CONNECTOR C-09 AND CONNECTORS C-50, C-51 FOR SHORT BETWEEN CIRCUITS •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connectors C-50, C-51. •  Connect the connector C-09. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2D and 2B. •  Is the voltage at body control module (BCM) terminals 2D and 2B the same?	Yes	Repair or replace the wiring harness between connectors C-50, C-51 and connector C-09 because the wiring harness is shorted between circuits.
		No	Go to the next step.
4	INSPECT CAN LINE BETWEEN PARKING ASSIST UNIT (ULTRASONIC) AND CONNECTORS C-50, C-51 FOR SHORT BETWEEN CIRCUITS •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Inspect for continuity between parking assist unit (ultrasonic) terminals 1X and 1Z. •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 7.
5	INSPECT CAN LINE BETWEEN PARKING ASSIST UNIT (ULTRASONIC) AND CONNECTOR C-61 FOR SHORT BETWEEN CIRCUITS •  Disconnect the connectors C-61. •  Inspect for continuity between parking assist unit (ultrasonic) terminals 1X and 1Z. •  Is there continuity?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the connectors C-50, C-51 and connector C-61 because the wiring harness is shorted between circuits.
6	INSPECT PARKING ASSIST UNIT (ULTRASONIC) FOR SHORT BETWEEN CIRCUITS •  Disconnect the parking assist unit (ultrasonic) connector. •  Inspect for continuity between parking assist unit (ultrasonic) terminals 1X and 1Z (wiring harness side). •  Is there continuity?	Yes	Repair or replace the wiring harness between the parking assist unit (ultrasonic) and connector C-61 because the wiring harness is shorted between circuits.
		No	Replace the parking assist unit (ultrasonic) because there is a short between circuits in the parking assist unit (ultrasonic). (See PARKING ASSIST UNIT (ULTRASONIC) REMOVAL/INSTALLATION.)
7	INSPECT BETWEEN REAR SIDE RADAR SENSOR (RH) AND CONNECTORS C-50, C-51 FOR SHORT BETWEEN CIRCUITS •  Inspect for continuity between rear side radar sensor (RH) terminals C and D. •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 10.
8	INSPECT BETWEEN REAR SIDE RADAR SENSOR (RH) AND CONNECTOR C-62 FOR SHORT BETWEEN CIRCUITS •  Disconnect the connectors C-62. •  Inspect for continuity between rear side radar sensor (RH) terminals C and D (wiring harness side). •  Is there continuity?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the connector C-62 and connectors C-50, C-51 because the wiring harness is shorted between circuits.
9	INSPECT REAR SIDE RADAR SENSOR (RH) FOR SHORT BETWEEN CIRCUITS •  Disconnect the rear side radar sensor (RH) connector. •  Inspect for continuity between rear side radar sensor (RH) terminals C and D (wiring harness side). •  Is there continuity?	Yes	Repair or replace the wiring harness between the rear side radar sensor (RH) and connector C-62 because the wiring harness is shorted between circuits.
		No	Replace the rear side radar sensor (RH) because there is a short between circuits in the rear side radar sensor (RH). (See REAR SIDE RADAR SENSOR REMOVAL/INSTALLATION.)
10	INSPECT ELECTRICAL SUPPLY UNIT (ESU) FOR SHORT BETWEEN CIRCUITS •  Connect the connectors C-50, C-51. •  Disconnect the electrical supply unit (ESU) connector. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2D and 2B. •  Is the voltage at body control module (BCM) terminals 2D and 2B the same?	Yes	Repair or replace the wiring harness between the electrical supply unit (ESU) and connectors C-50, C-51 because the wiring harness is shorted between circuits.
		No	Replace the electrical supply unit (ESU) because there is a short between circuits in the electrical supply unit (ESU). (See ELECTRICAL SUPPLY UNIT (ESU) REMOVAL/INSTALLATION.)