Lexus NX: Power Back Door cannot be Opened or Closed Using the Back Door Control Switch
DESCRIPTION
When the power back door cannot be closed using the back door control switch, either of the following may be malfunctioning: 1) back door control switch circuit or 2) multiplex network door ECU.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
If the replacement, removal and installation of the multiplex network door ECU or disconnection of the connectors of the multiplex network door ECU has been performed, initialize the power back door system.
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PROCEDURE
| 1. | READ VALUE USING TECHSTREAM |
(a) Read the Data List according to the display on the Techstream.
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| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| PBD Close SW | Back door control switch signal | ON or OFF | ON: Back door control switch pushed OFF: Back door control switch not pushed | - |
| Tester Display |
|---|
| PBD Close SW |
OK:
The back door control switch functions as specified in the normal condition column.
| OK | .gif) | REPLACE MULTIPLEX NETWORK DOOR ECU |
|
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| 2. | INSPECT BACK DOOR CONTROL SWITCH |
(a) Remove the back door control switch.
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(b) Inspect the back door control switch.
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| NG | | REPLACE BACK DOOR CONTROL SWITCH |
|
| 3. | CHECK HARNESS AND CONNECTOR (BACK DOOR CONTROL SWITCH - MULTIPLEX NETWORK DOOR ECU AND BODY GROUND) |
(a) Disconnect the Y28 back door control switch connector.
(b) Disconnect the Y26 multiplex network door ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Y28-5 (CLS) - Y26-8 (BDDN) | Always | Below 1 Ω |
| Y28-2 (E) - Body ground | Always | Below 1 Ω |
| Y28-5 (CLS) or Y26-8 (BDDN) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE MULTIPLEX NETWORK DOOR ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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