DTC 08

Component Location:

General Description
The body electrical system is comprised of six ECU applied CAN*1 communication nodes.
They are BCM (Body Control Module), power window main switch, power window assist switch, power seat ECU, tilt ECU,PIC (Personal Identification Card) ECU.
LIN*2 provides a low speed communication network. It is applied from power window switch to four SPW (Safety Power Window) ECU, seat switch module and from multi function switch to BCM.As the result, the high speed communication is set up by CAN and the low speed communication is set up by LIN.
Additionally for diagnosing entire system, scan tool access is facilitated.
*1 CAN (Cotroller Area Network) : CAN is a serial bus system especially suited for networking "intelligent" devices as well as sensors and actuators within a system or sub-system.
*2 LIN (Local Interconnect Network) : LIN is a new low cost serial communication system intended to be used for distributed electronic systems in vehicles, which complements the existing portfolio of automotive multiplex networks.

DTC Description
The BCM sets DTC CAN BUS OFF if the BCM detects CAN communication problem between BCM and other ECU's.

DTC Detecting Condition:

Schematic Diagram:

Signal Waveform:

Component Inspection

Check CAN Communication ECU's Internal Error
1. Ignition "ON" and engine "OFF"
2. Connect scantool and select DIAGNOSIS TROUBLE CODE.
3. Monitor that DTC is cleared by disconnecting of the ECU's* harness connector one by one.
*ECU's : power window main switch, power window assist switch, power seat ECU, tilt ECU, PIC(Personal Identification Card) ECU

4. Is CAN BUS OFF DTC cleared?

YES - Substitute with a known-good one of them and check proper condition.
If the problem is corrected, replace one of them and then go to "Verification of Vehicle Repair" procedure.

NO - 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.

Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode and then clear DTC.
2. Operate the vehicle within DTC Enable conditions in General information.
3. Are any DTCs present?

YES - Go to the applicable troubleshooting procedure.

NO - System is performing to specification at this time.