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

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

SM2566469

id1002x1004300

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 [(US)].)



System Wiring Diagram
am3zzw00027518



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 cable before performing any work that requires handling of connectors.

Step

Inspection

Action
1
INSPECT CAN LINE BETWEEN CONNECTOR C-49 AND BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY
• Switch the ignition off.
• Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Disconnect the connector C-49.
• Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Switch the ignition ON (engine 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 ignition off.
• Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Disconnect the connector 4 which has body control module (BCM) terminals 4R and 4Q.
• Connect the connector C-49.
• Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Switch the ignition ON (engine 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 connector C-49 because the wiring harness is shorted to the power supply.
3
INSPECT JB No.2 FOR SHORT TO POWER SUPPLY
• Switch the ignition off.
• Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Connect the connector C-49.
• Disconnect the connector C-48.
• Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Switch the ignition ON (engine 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
Replace the JB No.2 because there is a short to the power supply in the JB No.2.
4
INSPECT CAN LINE BETWEEN AUDIO AMPLIFIER AND CONNECTOR C-48 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 6.
No
Go to the next step.
5
INSPECT AUDIO AMPLIFIER FOR SHORT TO POWER SUPPLY
• Switch the ignition off.
• Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Disconnect the audio amplifier connector.
• Connect the connector C-48.
• Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Switch the ignition ON (engine 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.)
No
Repair or replace the wiring harness between the audio amplifier and connector C-48 because the wiring harness is shorted to the power supply.
6
INSPECT CAN LINE BETWEEN CONNECTOR C-48 AND CONNECTOR C-13 FOR SHORT TO POWER SUPPLY
• Switch the ignition off.
• Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Connect the connector C-48.
• Disconnect the connector C-13.
• Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Switch the ignition ON (engine 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 connector C-48 and connector C-13 because the wiring harness is shorted to the power supply.
7
INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR SHORT TO POWER SUPPLY
• Switch the ignition off.
• Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)])
• Disconnect the connectivity master unit (CMU) connector.
• Connect the connector C-13.
• Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)])
• Switch the ignition ON (engine 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.)
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.