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
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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
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Front Sensor Communication Malfunction (C1AEC)
DESCRIPTION This DTC is stored when there is an open or short circuit in the communication line between the front sensors and the ECU, or when there is a malfunction in a front sensor. DTC No. Detection Item DTC Detection Condition Trouble Area C1AEC Front Sensor Communication Malfunc
Side Satellite Sensor Bus Lost Communication (RH) (B1642,B1643,B1647,B1648)
DESCRIPTION The circuit for the side collision sensor LH or RH is composed of the airbag ECU assembly, side airbag sensor assembly LH or RH and door side airbag sensor LH or RH. The door side airbag sensor LH or RH and side airbag sensor assembly LH or RH detect impacts to the vehicle and send signa
