Lexus NX: Power Back Door cannot be Opened or Closed Using the Power Back Door Switch
DESCRIPTION
When the power back door cannot be opened or closed using the combination switch assembly, one of the following may be malfunctioning: 1) combination switch assembly circuit, 2) multiplex network door ECU or 3) main body ECU (multiplex network body ECU).
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this problem.
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-
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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- Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
-
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.
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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 |
|---|---|---|---|---|
| Back Door Open SW | Combination switch assembly signal | ON or OFF | ON: Combination switch assembly pushed OFF: Combination switch assembly not pushed | - |
| Tester Display |
|---|
| Back Door Open SW |
OK:
The combination switch assembly functions as specified in the normal condition column.
| NG | .gif) | GO TO STEP 5 |
|
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| 2. | REPLACE MULTIPLEX NETWORK DOOR ECU |
(a) Temporarily replace the multiplex network door ECU with a new or normally functioning one.
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|
| 3. | INITIALIZE MULTIPLEX NETWORK DOOR ECU |
(a) Perform the initialization for the multiplex network door ECU.
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|
| 4. | CHECK POWER BACK DOOR SYSTEM |
(a) Check that the power back door operates normally.
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OK:
Power back door operates normally
| OK | | END (MULTIPLEX NETWORK DOOR ECU WAS DEFECTIVE) |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 5. | INSPECT COMBINATION SWITCH ASSEMBLY |
(a) Remove the combination switch assembly.
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(b) Inspect the combination switch assembly.
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| NG | | REPLACE COMBINATION SWITCH ASSEMBLY |
|
| 6. | CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] AND BODY GROUND) |
(a) Disconnect the I33 combination switch assembly connector.
(b) Disconnect the I47 main body ECU (multiplex network body ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I33-6 (B) - I47-5 (PBDS) | Always | Below 1 Ω |
| I33-16 (L) - Body ground | Always | Below 1 Ω |
| I33-6 (B) or I47-5 (PBDS) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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