4.
After erase DTC, keep the vehicle condition within "the enable conditions" (Refer to "DTC Detecting Condition" table).
All 10 units which consists of the Body Electrical Control System are linked by CAN*¹ line.
They are IPM(Inter Panel Module), FAM(Front Area Module), PDM(Power Distribution Module),
DDM(Drive Door Module), ADM(Assist Door Module), CLU(Cluster), PSM(Power Seat Module),
SCM(Steering Control Module), RAM(Rear Area Module), SMK(Smart Key).
*¹ CAN (Controller Area Network) : CAN is serial bus communication type which links not only communication system but also control units each other.
*² LIN (Local Interconnect Network) : LIN is serial communication type which is used in electrical control system. (This is less expensive.)
"B1646" is set in case of CAN communication failure due to either FAM, RAM not existing at CAN line or IPM, FAM, RAM internal fault.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Network state check | ● CAN Line check ● FAM, IPM, RAM operation check |
Enable Conditions | ● IG "ON" | |
Threshold Value | ● RF Module being not in accordance with regional frequency installed | |
Diagnostic Time | ● Immediately | |
DTC Erasing Time | ● DTC is erased immediately after trouble fixed. |
Fig 1) CAN Low/High Signal
Fig 2) CAN BUS VOLTAGE LEVEL (LOW SPEED CAN)
Connect GDS.
IG "ON" and engine "OFF".
Select "DTC Analysis" mode.
After erase DTC, keep the vehicle condition within "the enable conditions" (Refer to "DTC Detecting Condition" table).
Is the same DTC occurred again?
 | ▶ Go to next procedure. |
 | ▶ Fault is intermittent caused by poor contact in the sensor's and/or RAM's connector or was repaired and RAM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure. |
Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
| ▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure. |
| ▶ Go to "Component Inspection" procedure. |
Check internal errors of RAM.
IGN "OFF"
Substitute with a known - good RAM.
IGN "ON" & ENG "OFF"
Connect GDS and then select "DTC Analysis" mode.
Is the code erased?
| ▶ Substitute with a known - good RAM and check for proper operation. If the problem is corrected, replace the RAM and go to "Verification of Vehicle Repair" procedure. |
| ▶ Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure. |
After a repair, it is essential to verify that the fault has been corrected.
Connect scan tool and select "DTC Analysis" mode.
Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
Is any DTC outputted again?
| ▶ Go to the applicable troubleshooting procedure. |
| ▶ System performing to specification at this time. |
