Lexus NX: System Description
SYSTEM DESCRIPTION
BACK DOOR CLOSER SYSTEM DESCRIPTION
(a) Operating any back door opener switch assembly when the back door is fully closed inputs a request signal to the multiplex network door ECU. The multiplex network door ECU outputs a "latch release" command to the back door lock assembly in response to the input.
(b) The latch can be released only when the back door is unlocked.
(c) 3 switches are built into the back door lock assembly, and the multiplex network door ECU monitors each switch status. The multiplex network door ECU controls latch "release/close" operations in response to the inputs from each switch.
| Switch | Function |
|---|---|
| Back door courtesy light switch | Detects whether back door is open or closed. This switch turns on when back door is open or ajar and turns off when it is fully closed. |
| Latch switch | Detects fully closed position of latch. This switch turns on when latch is in open-latch position. |
| Initial switch | Detects ajar position of latch. This switch turns on when latch is in half-latch position. |
FUNCTION OF MAIN COMPONENTS
| Component | Function |
|---|---|
| Multiplex network door ECU | The multiplex network door ECU controls the back door closer system in accordance with the signals received from the back door lock assembly. |
| Back door lock assembly | Receives an operation signal from the multiplex network door ECU to open/close the back door. |
CONSTRUCTION AND OPERATION
(a) Closing Operation
(b) Opening Operation
READ NEXT:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
The back door closer system troubleshooting procedure is based on the premise that the power back door system is operating normally. Check the power back door system f
Operation Check
OPERATION CHECK CHECK BASIC FUNCTIONS (a) When the back door is partially closed, check that the motor operates to fully close (lock) the back door. (b) Check that the back door can be opened. (c) Whe
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of
SEE MORE:
Components
COMPONENTS ILLUSTRATION *A w/ Roof Rack - - *1 REAR ROOF DRIP SIDE FINISH MOULDING LH *2 ROOF DRIP SIDE FINISH MOULDING CLIP *3 ROOF DRIP SIDE FINISH MOULDING LH - - ● Non-reusable part - - ILLUSTRATION *A w/o Roof Rack, except Glass Roof - -
Lost Communication With Multi-axis Acceleration Sensor Module Missing Message (U012587,U012687,U012987,U013187,U015587,U029387)
DESCRIPTION When a malfunction is detected between various ECUs and sensors, these DTCs are stored. DTC No. Detection Item DTC Detection Condition Trouble Area U012587 Lost Communication With Multi-axis Acceleration Sensor Module Missing Message 3 seconds after the power switch is t
