CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [TYPE-B]

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Note
•  It is necessary to select the CAN BUS to be diagnosed.Verify the module displayed in red (communication disabled) or blue (communication disabled or module not installed) from the network view on the M-MDS, and select any one CAN BUS between No.1 to 3.

CAN topology

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1.  Connect the M-MDS to the DLC-2.

2.  Verify the module displayed in red or blue on the M-MDS using the network view.

3.  Verify the applicable CAN BUS table and select the CAN BUS reference corresponding to the module displayed in red or blue on the M-MDS. (See CAN BUS table.)

Note
•  The module may be displayed in red or blue on the M-MDS screen even if there is no malfunction depending on the vehicle specification.


CAN BUS table

Cross (×): module displayed in red or blue

CAN communication related module

(M-MDS display)

CAN BUS No.1

CAN BUS No.2

CAN BUS No.3
PCM
(PCM)
×
    
DSC HU/CM
(ABS)
×
    
Radar unit
(SBS/MRCC)
×
    
TCM
(TCM)
×
    
Front body control module (FBCM)
(F_BCM)
×
    
Adaptive front lighting system (AFS) control module / auto leveling control module / adaptive LED headlights control module
(AFS/ALM)
×
    
Power liftgate (PLG) control module
(PLG)
×
    
Rear power seat control module (LH)
(RSML)
×
    
Rear power seat control module (RH)
(RSMR)
×
    
Rear one-touch walk-in control module
(RSML)
×
    
Electric parking brake control module
(EPB)
×
    
4WD control module
(4×4)
×
    
Occupant classification sensor
×
    
Position memory control module
(DSM)
×
    
Forward sensing camera (FSC)
(FSC)
×
    
SAS control module
(RCM)
×
    
EPS control module
(EPS)
×
    
Start stop unit
(SSU)
×
    
Active driving display
(HUD)
×
    
Instrument cluster
(IC)
×
×
  
Wireless charger (Qi)
 
×
  
Front climate control unit
(EATC)
 
×
  
Parking assist unit
(PSM)
 
×
  
Blind spot monitoring (BSM) control module (LH)
(BSM)
  
×
  
Rear body control module (RBCM)
(R_BCM)
  
×
  
Audio amplifier
(AM)
 
  
×
360° view monitor control module
(VMC)
 
  
×
Connectivity master unit (CMU)
(CMU)
 
  
×
Gateway unit (GWU)
(GWU)
×
×
×
Diagnostic result
CAN BUS reference
(See CAN-BUS No.1)
(See CAN-BUS No.2)
(See CAN-BUS No.3)


CAN-BUS No.1

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 terminal before performing any work that requires handling of connectors.

Step

Inspection

Action
1
INSPECT FOR SHORT TO GROUND IN CAN-BUS NO.1
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Inspect for continuity at the following terminals:
―  Between gateway unit (GWU) terminal 3X and body ground
―  Between gateway unit (GWU) terminal 3W and body ground
•  Is there continuity?
Yes
Short to ground in CAN-BUS No.1 has occurred.
Determine the location of a short to ground according to the diagnosis procedure for determining the location of a short to ground in CAN-BUS No.1.
(See DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.1) [TYPE-B])
No
Go to the next step.
2
INSPECT FOR SHORT TO POWER SUPPLY IN CAN-BUS No.1
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at gateway unit (GWU) terminal 3X and 3W.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Short to power supply in CAN-BUS No.1 has occurred.
Determine the location of a short to power supply according to the diagnosis procedure for determining the location of a short to power supply in CAN-BUS No.1.
(See DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.1) [TYPE-B])
3
INSPECT FOR SHORT BETWEEN CIRCUITS IN CAN-BUS No.1
•  Measure the voltage at gateway unit (GWU) terminals 3X and 3W.
•  Is the voltage at gateway unit (GWU) terminals 3X and 3W the same?
Yes
Short between circuits in CAN-BUS No.1 has occurred.
Determine the location of a short between circuits according to the diagnosis procedure for determining the location of a short between circuits in CAN-BUS No.1.
(See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.1) [TYPE-B])
No
An open circuit in CAN-BUS No.1 has occurred.
Determine the location of an open circuit in CAN-BUS No.1.
(See DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.1) [TYPE-B])


CAN-BUS No.2

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 terminal before performing any work that requires handling of connectors.

Step

Inspection

Action
1
INSPECT FOR SHORT TO GROUND IN CAN-BUS No.2
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Inspect for continuity at the following terminals:
―  Between gateway unit (GWU) terminal 2L and body ground
―  Between gateway unit (GWU) terminal 2J and body ground
•  Is there continuity?
Yes
Short to ground in CAN-BUS No.2 has occurred.
Determine the location of a short to ground according to the diagnosis procedure for determining the location of a short to ground in CAN-BUS No.2.
(See DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.2) [TYPE-B])
No
Go to the next step.
2
INSPECT FOR SHORT TO POWER SUPPLY IN CAN-BUS No.2
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at gateway unit (GWU) terminal 2L and 2J.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Short to power supply in CAN-BUS No.2 has occurred.
Determine the location of a short to power supply according to the diagnosis procedure for determining the location of a short to power supply in CAN-BUS No.2.
(See DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.2) [TYPE-B])
3
INSPECT FOR SHORT BETWEEN CIRCUITS IN CAN-BUS No.2
•  Measure the voltage at gateway unit (GWU) terminals 2L and 2J
•  Is the voltage at gateway unit (GWU) terminals 2L and 2J the same?
Yes
Short between circuits in CAN-BUS No.2 has occurred.
Determine the location of a short between circuits according to the diagnosis procedure for determining the location of a short between circuits in CAN-BUS No.2.
(See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.2) [TYPE-B])
No
An open circuit in CAN-BUS No.2 has occurred.
Determine the location of an open circuit in CAN-BUS No.2.
(See DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.2) [TYPE-B])


CAN-BUS No.3

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 terminal before performing any work that requires handling of connectors.

Step

Inspection

Action
1
INSPECT FOR SHORT TO GROUND IN CAN-BUS No.3
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Inspect for continuity at the following terminals:
―  Between gateway unit (GWU) terminal 4R and body ground
―  Between gateway unit (GWU) terminal 4Q and body ground
•  Is there continuity?
Yes
Short to ground in CAN-BUS No.3 has occurred.
Determine the location of a short to ground according to the diagnosis procedure for determining the location of a short to ground in CAN-BUS No.3.
(See DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.3) [TYPE-B])
No
Go to the next step.
2
INSPECT FOR SHORT TO POWER SUPPLY IN CAN-BUS No.3
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off).
•  Measure the voltage at gateway unit (GWU) terminal 4R and 4Q.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Short to power supply in CAN-BUS No.3 has occurred.
Determine the location of a short to power supply according to the diagnosis procedure for determining the location of a short to power supply in CAN-BUS No.3.
(See DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.3) [TYPE-B])
3
INSPECT FOR SHORT BETWEEN CIRCUITS IN CAN-BUS No.3
•  Measure the voltage at gateway unit (GWU) terminals 4R and 4Q.
•  Is the voltage at gateway unit (GWU) terminals 4R and 4Q the same?
Yes
Short between circuits in CAN-BUS No.3 has occurred.
Determine the location of a short between circuits according to the diagnosis procedure for determining the location of a short between circuits in CAN-BUS No.3.
(See DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.3) [TYPE-B])
No
An open circuit in CAN-BUS No.3 has occurred.
Determine the location of an open circuit in CAN-BUS No.3.
(See DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.3) [TYPE-B])