DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.7) [L.H.D.]

id100225004200

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

a30zzw00004622

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 CAN LINE IN BODY CONTROL MODULE (BCM) FOR SHORT TO GROUND •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION) •  Disconnect the connector 4 which has body control module (BCM) terminals 4R and 4Q. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 4R and body ground ―  Between body control module (BCM) terminal 4Q and body ground •  Is there continuity?	Yes	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.)
		No	Go to the next step.
2	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-41 AND BODY CONTROL MODULE (BCM) •  Disconnect the connector C-41. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 4R (wiring harness side) and body ground ―  Between body control module (BCM) terminal 4Q (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the body control module (BCM) and connector C-41 because the wiring harness is shorted to ground.
		No	Go to the next step.
3	INSPECT FOR SHORT TO GROUND BETWEEN AUDIO AMPLIFIER AND CONNECTOR C-41 •  Inspect for continuity at the following terminals: ―  Between audio amplifier terminal 2N and body ground (With Bose® type audio) ―  Between audio amplifier terminal 2M and body ground (With Bose® type audio) ―  Between audio amplifier terminal 1Q and body ground (Without Bose® type audio) ―  Between audio amplifier terminal 1S and body ground (Without Bose® type audio) •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 5.
4	INSPECT CAN LINE IN AUDIO AMPLIFIER FOR SHORT TO GROUND •  Disconnect the audio amplifier connector. •  Inspect for continuity at the following terminals: ―  Between audio amplifier terminal 2N (wiring harness side) and body ground (With Bose® type audio) ―  Between audio amplifier terminal 2M (wiring harness side) and body ground (With Bose® type audio) ―  Between audio amplifier terminal 1Q (wiring harness side) and body ground (Without Bose® type audio) ―  Between audio amplifier terminal 1S (wiring harness side) and body ground (Without Bose® type audio) •  Is there continuity?	Yes	Repair or replace the wiring harness between the audio amplifier and connector C-41 because the wiring harness is shorted to ground.
		No	Replace the audio amplifier because there is a short to ground in the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION [(E)].)
5	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-13 AND CONNECTOR C-41 •  Disconnect the connector C-13. •  Connect the connector C-41. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 4R (wiring harness side) and body ground ―  Between body control module (BCM) terminal 4Q (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between connector C-13 and connector C-41 because the wiring harness is shorted to ground.
		No	Go to the next step.
6	INSPECT CAN LINE IN CONNECTIVITY MASTER UNIT (CMU) FOR SHORT TO GROUND •  Disconnect the connectivity master unit (CMU) connector. •  Inspect for continuity at the following terminals: ―  Between connectivity master unit (CMU) terminal 1Q (wiring harness side) and body ground ―  Between connectivity master unit (CMU) terminal 1O (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the connectivity master unit (CMU) and connector C-13 because the wiring harness is shorted to ground.
		No	Replace the connectivity master unit (CMU) because there is a short to ground in the connectivity master unit (CMU). (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION [(E)].)