DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.4) [L.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.(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

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.

Step	Inspection		Action
1	INSPECT FOR SHORT TO GROUND BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTOR C-09 •  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. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 2D and body ground ―  Between body control module (BCM) terminal 2B and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 3.
2	INSPECT CAN LINE IN BODY CONTROL MODULE (BCM) FOR SHORT TO GROUND •  Disconnect the connector 2 which has body control module (BCM) terminals 2D and 2B. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 2D (wiring harness side) and body ground ―  Between body control module (BCM) terminal 2B (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the connector C-09 and body control module (BCM) because the wiring harness is shorted to ground.
		No	Replace the body control module (BCM) because there is a short to ground in the body control module (BCM). (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
3	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-09 AND CONNECTORS C-50, C-51 •  Disconnect the connectors C-50, C-51. •  Connect the connector C-09. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 2D and body ground ―  Between body control module (BCM) terminal 2B and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the connector C-09 and connectors C-50, C-51 because the wiring harness is shorted to ground.
		No	Go to the next step.
4	INSPECT FOR SHORT TO GROUND BETWEEN PARKING ASSIST UNIT (ULTRASONIC) AND CONNECTORS C-50, C-51 •  Inspect for continuity at the following terminals: ―  Between parking assist unit (ultrasonic) terminal 1X and body ground ―  Between parking assist unit (ultrasonic) terminal 1Z and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 7.
5	INSPECT FOR SHORT TO GROUND BETWEEN PARKING ASSIST UNIT (ULTRASONIC) AND CONNECTOR C-61 •  Disconnect the connector C-61. •  Inspect for continuity at the following terminals: ―  Between parking assist unit (ultrasonic) terminal 1X and body ground ―  Between parking assist unit (ultrasonic) terminal 1Z and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the connector C-61 and connectors C-50, C-51 because the wiring harness is shorted to ground.
6	INSPECT CAN LINE IN PARKING ASSIST UNIT (ULTRASONIC) FOR SHORT TO GROUND •  Disconnect the parking assist unit (ultrasonic) connector. •  Inspect for continuity at the following terminals: ―  Between parking assist unit (ultrasonic) terminal 1X (wiring harness side) and body ground ―  Between parking assist unit (ultrasonic) terminal 1Z (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the connector C-61 and parking assist unit (ultrasonic) because the wiring harness is shorted to ground.
		No	Replace the parking assist unit (ultrasonic) because there is a short to ground in the parking assist unit (ultrasonic). (See PARKING ASSIST UNIT (ULTRASONIC) REMOVAL/INSTALLATION.)
7	INSPECT FOR SHORT TO GROUND BETWEEN REAR SIDE RADAR SENSOR (RH) AND CONNECTORS C-50, C-51 •  Inspect for continuity at the following terminals: ―  Between rear side radar sensor (RH) terminal C and body ground ―  Between rear side radar sensor (RH) terminal D and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 10.
8	INSPECT FOR SHORT TO GROUND BETWEEN REAR SIDE RADAR SENSOR (RH) AND CONNECTOR C-62 •  Disconnect the connector C-62. •  Inspect for continuity at the following terminals: ―  Between rear side radar sensor (RH) terminal C and body ground ―  Between rear side radar sensor (RH) terminal D and body ground •  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 to ground.
9	INSPECT CAN LINE IN REAR SIDE RADAR SENSOR (RH) FOR SHORT TO GROUND •  Disconnect the rear side radar sensor (RH) connector. •  Inspect for continuity at the following terminals: ―  Between rear side radar sensor (RH) terminal C (wiring harness side) and body ground ―  Between rear side radar sensor (RH) terminal D (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between connector C-62 and rear side radar sensor (RH) because the wiring harness is shorted to ground.
		No	Replace the rear side radar sensor (RH) because there is a short to ground in the rear side radar sensor (RH). (See REAR SIDE RADAR SENSOR REMOVAL/INSTALLATION.)
10	INSPECT CAN LINE IN ELECTRICAL SUPPLY UNIT (ESU) FOR SHORT TO GROUND •  Disconnect the electrical supply unit (ESU) connector. •  Inspect for continuity at the following terminals: ―  Between electrical supply unit (ESU) terminal 1X (wiring harness side) and body ground ―  Between electrical supply unit (ESU) terminal 1W (wiring harness side) and body ground •  Is there continuity?	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 to ground.
		No	Replace the electrical supply unit (ESU) because there is a short to ground in the electrical supply unit (ESU). (See ELECTRICAL SUPPLY UNIT (ESU) REMOVAL/INSTALLATION.)