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Optima/Magentis(MG) > 2010 > D 2.0 TCI-D > Smart Key > Smart Key Unit >
B1604 CAN Timeout between SMK and (IPM or BCM)
B1604 CAN Timeout between SMK and (IPM or BCM) > General Information
Component Location
General Description
CAN Communication is a circuit, consists of CAN LOW and CAN HIGH, in order to communicate among control
units. Control Modules are respectively communicating via CAN line in order to control Body Electrical.
DTC Description
Smart Key module sets DTC B1604 if Smartkey Module have not received CAN signal from BCM for 3 sec.
DTC Detecting Condition
Item Detecting Condition Possible cause
• Poor Connection
DTC Strategy • CAN signal check • Power source to Smart Key
module
• Power source to BCM
Enable Conditions • IG ON • Short to battery in CAN
communication line
• Short to ground in CAN
communication line
Threshold value • No can signal message from BCM for 3 sec. • Short between CAN HIGH
AND LOW communication
line each other
Failsafe •- • Faulty Smartkey Module
• Faulty BCM
Diagnostic Circuit Diagram
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Signal Waveform
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B1604 CAN Timeout between SMK and (IPM or BCM) > Scantool Diagnostics
Monitor GDS data
■ Check DTC
1. Check DTC with GDS.
2. Check DTC related CAN communication is set on BCM.
3. If there is DTC related BCM, Check the DTC according to troubleshooting guide
4. Repair and erase the DTC with GDS.
5. Is the DTC erased ?
▶ Check poor connection between harness connector and each module : Thoroughly check
the looseness, poor connection, bent, corrison, contamination, deformation or damage of
connector. Repair or replace as necessary and then, go to "Verification of Vehicle Repair"
procedure.
▶ Go to next procedure.
B1604 CAN Timeout between SMK and (IPM or BCM) > Inspection/Repair >
W/Harness Inspection
Terminal and Connector Inspection
1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be
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caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination,
deterioration,or damage.
3. Has a problem been found?
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Go to 'Check CAN communication Line" procedure.
CAN communication Line Inspection
■ Check CAN communication
1. Connect all of control module connector.
2. IG KEY ON.
3. Make sure that CAN communication is wake up status (Ex. ON/OFF Door SW)
4. Measure signal waveform of B-CAN-HIGH terminal of SMK Module connector and chassis ground.
5. Measure signal waveform of B-CAN-LOW terminal of SMK Module connector and chassis ground.
6. Is the measrured signal waveform normal ?
▶ Go to next procedure.
▶ If the measured value is battery voltage, check short to battery in CAN line. Repair or
replace as necessary. And then, go to "Verification of Vehicle Repair" procedure. In case
that Communication is in sleep mode, 12V will be measured. Therefore, check that
communication is in Wake up status.
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▶ If 0V is detected, Check short to ground, short between CAN high and low each other or
open in CAN high or CAN low harness. Repair or replace as necessary and then, go to
"Verification of Vehicle Repair" procedure.
■ Check open in CAN communication line
1. IG KEY OFF.
2. Disconnect Smartkey Module and BCM connector.
3. Measure resistance between communication line terminal of Smartkey Module connector and communication
line of BCM harness connector.
4. Is the measured resistance within specification ?
▶ Check poor connection between harness connector and Smartkey Module or BCM :
Thoroughly check the looseness, poor connection, bent, corrison, contamination,
deformation or damage of connector. Repair or replace as necessary and then,
▶ Repair or replace open in CAN communication line and go to 'Verification of Vehicle
Repair" procedure.
B1604 CAN Timeout between SMK and (IPM or BCM) > Verification of Vehicle
Repair
Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
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1. Connect GDS and selet "Diagnostic Trouble Codes(DTCs)" mode and then clear DTC.
2. Operate the vehicle and monitor the DTC on the GDS.
3. Are any DTCs present?
▶ Go to the applicable troubleshooting procedure.
▶ System is performing to specification at this time.
B1604 CAN Timeout between SMK and (IPM or BCM) > Circuit diagram
Schematic Circuit Diagram
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