Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM1000000018DN7 |
Model Year Start: 2018 |
Model: Sienna |
Prod Date Range: [11/2017 -
] |
Title: NETWORKING: CAN COMMUNICATION SYSTEM: Check Bus 2 Line for Short to +B; 2018 - 2020 MY Sienna [11/2017 - ] |
Check Bus 2 Line for Short to +B
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DESCRIPTION
There may be a short circuit between one of the CAN bus wires and +B when no resistance exists between terminal 18 (CA4H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 17 (CA4L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.
Detection Item
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Trouble Area
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No resistance exists between terminal 18 (CA4H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 17 (CA4L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.
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-
Short to +B in bus 2 CAN main wires
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Short to +B in bus 2 CAN branch wires
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ECM
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4WD control ECU*1
-
Airbag sensor assembly
-
Air conditioning amplifier assembly
-
Central gateway ECU (network gateway ECU)
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Main body ECU (multiplex network body ECU)
-
Brake actuator assembly (skid control ECU)
-
Certification ECU (smart key ECU assembly)*2
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Power management control ECU*2
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Steering column assembly (power steering ECU)
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Steering angle sensor (spiral cable with sensor sub-assembly)
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Combination meter assembly
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No. 5 junction connector
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No. 6 junction connector
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-
*1: for AWD
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*2: w/ Smart Key System
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
-
Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
-
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
1.
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CHECK FOR SHORT TO B+ IN CAN BUS WIRE (COMBINATION METER ASSEMBLY - NO. 5 JUNCTION CONNECTOR)
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(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the combination meter assembly connector.
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*1
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DLC3
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*a
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Front view of wire harness connector
(to Combination Meter Assembly)
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|
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(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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D145-17 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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D145-16 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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NG
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|
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(a) Reconnect the D145 combination meter assembly connector.
NEXT
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|
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3.
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CHECK FOR SHORT TO B+ IN CAN BUS WIRE (ECM - NO. 6 JUNCTION CONNECTOR)
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(a) Disconnect the ECM connector.
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*1
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DLC3
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*a
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Front view of wire harness connector
(to ECM)
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|
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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A69-13 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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A69-26 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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NG
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|
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(a) Reconnect the A69 ECM connector.
NEXT
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|
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5.
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CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 5 JUNCTION CONNECTOR)
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(a) Disconnect the central gateway ECU (network gateway ECU) connector.
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*1
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DLC3
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*a
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Front view of wire harness connector
(Central Gateway ECU (Network Gateway ECU))
|
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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D202-18 (CA4H) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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D202-17 (CA4L) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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NG
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|
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(a) Reconnect the D202 central gateway ECU (network gateway ECU) connector.
NEXT
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7.
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CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 5 JUNCTION CONNECTOR)
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(a) Disconnect the No. 5 junction connector.
*1
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DLC3
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-
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-
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*a
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Front view of wire harness connector
(to No. 5 Junction Connector)
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*b
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to No. 6 Junction Connector
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*c
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to Brake Actuator Assembly (Skid Control ECU)
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*d
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to Certification ECU (Smart Key ECU Assembly) (w/ Smart Key System)
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*e
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to Power Management Control ECU (w/ Smart Key System)
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*f
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to Combination Meter Assembly
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*g
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to Air Conditioning Amplifier Assembly
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*h
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to Central Gateway ECU (Network Gateway ECU)
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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Connect to
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D179-8 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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No. 6 junction connector
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D179-19 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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D179-1 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Brake actuator assembly (skid control ECU)
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D179-12 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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D179-3 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Certification ECU (smart key ECU assembly)*
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D179-14 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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D179-4 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Power management control ECU*
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D179-15 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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D179-7 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Combination meter assembly
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D179-18 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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D179-2 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Air conditioning amplifier assembly
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D179-13 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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D179-5 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
|
Central gateway ECU (network gateway ECU)
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D179-16 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
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Result
Result
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Proceed to
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OK
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A
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NG (Combination meter assembly CAN main wire)
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B
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NG (Central gateway ECU (network gateway ECU) CAN branch wire)
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C
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NG (No. 6 junction connector CAN main wire)
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D
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NG (ECU or sensor CAN branch wires)
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E
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A |
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REPLACE NO. 5 JUNCTION CONNECTOR
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B |
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REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 5 JUNCTION CONNECTOR - ECM)
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C |
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REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NO. 5 JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
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D
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(a) Reconnect the D179 No. 5 junction connector.
NEXT
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9.
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CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 6 JUNCTION CONNECTOR)
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(a) Disconnect the No. 6 junction connector.
*1
|
DLC3
|
-
|
-
|
*a
|
Front view of wire harness connector
(to No. 6 Junction Connector)
|
*b
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to No. 5 Junction Connector
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*c
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to Main Body ECU (Multiplex Network Body ECU)
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*d
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to 4WD ECU Assembly (for AWD)
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*e
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to Airbag Sensor Assembly
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*f
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to ECM
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*g
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to Steering Column Assembly (Power Steering ECU)
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*h
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to Steering Angle Sensor (Spiral Cable with Sensor Sub-assembly)
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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Connect to
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D180-1 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
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No. 5 junction connector
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D180-12 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
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D180-4 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
Main body ECU (multiplex network body ECU)
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D180-15 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
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D180-5 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
4WD ECU assembly*
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D180-16 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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D180-9 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
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Airbag sensor assembly
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D180-20 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
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D180-7 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
ECM
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D180-18 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
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D180-3 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Steering column assembly (power steering ECU)
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D180-14 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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D180-2 (CANH) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
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6 kΩ or higher
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Steering angle sensor (spiral cable with sensor sub-assembly)
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D180-13 (CANL) - D16-16 (BAT)
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Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
Result
Result
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Proceed to
|
OK
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A
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NG (ECM CAN main wire)
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B
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NG (No. 5 junction connector CAN main wire)
|
C
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NG (ECU or sensor CAN branch wires)
|
D
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A |
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REPLACE NO. 6 JUNCTION CONNECTOR
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B |
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REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 6 JUNCTION CONNECTOR - ECM)
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C |
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REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 6 JUNCTION CONNECTOR - NO. 4 CAN JUNCTION CONNECTOR)
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D
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|
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10.
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CHECK FOR SHORT TO B+ IN CAN BUS WIRE (ECU, SENSOR)
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(a) Reconnect the CAN junction connector.
|
|
*1
|
DLC3
|
*a
|
Component with harness connected
(Central Gateway ECU (Network Gateway ECU))
|
|
|
(b) Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to +B is connected
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
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Specified Condition
|
D202-18 (CA4H) - D16-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
D202-17 (CA4L) - D16-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
HINT:
If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
OK |
|
REPLACE CORRESPONDING ECU OR SENSOR
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NG |
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REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR CAN BRANCH WIRES OR CONNECTOR
|
|