B1645
DTC B1645 DRIVE UNIT FAILComponent Location:
GENERAL DESCRIPTION
Power tailgate (hereinafter PTG) is the system which moves tailgate of vehicle by electronic motor so that user can open or close door with less force than required on manual operation. PTG consists of drive unit, handle, switch, warning buzzer, anti pinch(right/left) and cinch/latch (2 switch each). Drive unit is located at left D pillar (quarter panel). It is core part of PTG that drives lea which is connected with push rod by force of motor to move tailgate. beside that Drive unit consists of PTG ECU, motor, push rod, channel, clutch and two optical sensor.
DTC DESCRIPTION
The ECM sets DTC B1645 if the door doesn't move to intended position within specificated time at power mode operation.
DTC Detecting Condition:
MONITOR DTC STATUS
1. Connect scantool to Data Link Connector (DLC).
2. Ignition "ON" & engine "OFF" & PTG "ON"
3. Select "Diagnostic Trouble Codes (DTCs)" mode and monitor "DTC Status" parameter.
4. Is the DTC B1645 present?
YES - Go to "Inspection & Repair" procedure.
NO - Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM 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.
COMPONENT INSPECTION
1. Check battery
1. Connect scantool to Data Link Connector (DLC).
2. Ignition "ON" & engine "OFF" & PTG "ON"
3. Monitor the "Battery Power Voltage" Parameter on the Scantool.
Specification : at starting -> 9.5 V or more, on moving -> 8.0 V or more
4. Is the measured current data within specifications?
YES - Go to "Check drive unit" procedure.
NO - Substitute with a known-good battery and check for proper operation. If the problem is corrected, replace battery and then go to "Verification of Vehicle Repair" procedure.
2. Check drive unit
1. Ignition "ON" & engine "OFF" & PTG "ON"
2. Position the door at full open or primary latch position
3. Measure cycle time while Operating the door to the reverse of current position by power mode.
Specification : Open cycle time -> 7.0 ± 2.0 sec, Close cycle time -> 8.5 ± 2.0 sec.
4. Is the measured cycle time within specifications?
YES - Check cable and part for looseness, poor connection, bending, corrosion, contamination, deterioration. or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair," procedure.
NO - Substitute with a known-good drive unit ana check for proper operation. If the problem is corrected. Replace drive unit 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 scantool and select "Diagnostic Trouble Codes (DTCs)" mode and then clear DTC.
2. Operate the vehicle and monitor the DTC on the scantool.
3. Are any DTCs present?
YES - Go to the applicable troubleshooting procedure.
NO - System is performing to specification at this time.