DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.7) [R.H.D.]

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Caution

•  Perform the following malfunction diagnosis only when it is diagnosed with a short to power supply 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 CAN LINE BETWEEN CONNECTORS C-80, C-81 AND BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connectors C-80, C-81. •  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 4R and 4Q. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 3.
		No	Go to the next step.
2	INSPECT BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY •  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. •  Connect the connectors C-80, C-81. •  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 4R and 4Q (wiring harness side). •  Is the voltage between 1.5—3.5 V?	Yes	Replace the body control module (BCM) because there is a short to the power supply in the body control module (BCM). (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the body control module (BCM) and connectors C-80, C-81 because the wiring harness is shorted to the power supply.
3	INSPECT CAN LINE BETWEEN AUDIO AMPLIFIER AND CONNECTORS C-80, C-81 FOR SHORT TO POWER SUPPLY •  Measure the voltage at audio amplifier terminals 2N and 2M. (With Bose® type audio) •  Measure the voltage at audio amplifier terminals 1Q and 1S. (Without Bose® type audio) •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 5.
		No	Go to the next step.
4	INSPECT AUDIO AMPLIFIER FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the audio amplifier connector. •  Connect the connectors C-80, C-81. •  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 4R and 4Q. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the audio amplifier because there is a short to the power supply in the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION [(E)].)
		No	Repair or replace the wiring harness between the audio amplifier and connectors C-80, C-81 because the wiring harness is shorted to the power supply.
5	INSPECT CAN LINE BETWEEN CONNECTORS C-80, C-81 AND CONNECTOR C-13 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Connect the connectors C-80, C-81. •  Disconnect the connector C-13. •  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 4R and 4Q. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the connectors C-80, C-81 and connector C-13 because the wiring harness is shorted to the power supply.
6	INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION) •  Disconnect the connectivity master unit (CMU) connector. •  Connect the connector C-13. •  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 4R and 4Q. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the connectivity master unit (CMU) because there is a short to the power supply in the connectivity master unit (CMU). (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION [(E)].)
		No	Repair or replace the wiring harness between the connectivity master unit (CMU) and connector C-13 because the wiring harness is shorted to the power supply.