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DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.8) [(US)]

DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.8) [(US)]

SM2566473

id1002x1004700

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
am3zzw00027519



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 BODY CONTROL MODULE (BCM) AND TELEMATICS COMMUNICATION UNIT FOR SHORT TO POWER SUPPLY
• Switch the ignition off.
• Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Disconnect the connector 3 which has body control module (BCM) terminals 3U and 3W.
• 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 3U and 3V (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
Go to the next step.
2
INSPECT TELEMATICS COMMUNICATION UNIT FOR SHORT TO POWER SUPPLY
• Switch the ignition off.
• Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Disconnect the telematics communication unit connector.
• Connect the connector 3 which has body control module (BCM) terminals 3U and 3W.
• 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 3U and 3V.
• Is the voltage between 1.5—3.5 V?
Yes
Replace the telematics communication unit because there is a short to the power supply in the telematics communication unit.
(See TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION.)
No
Repair or replace the wiring harness between the telematics communication unit and body control module (BCM) because the wiring harness is shorted to the power supply.