Lexus NX: Power Back Door cannot be Opened Using the Back Door Opener Switch
DESCRIPTION
The multiplex network door ECU receives an open signal from the back door opener switch assembly via the certification ECU (smart key ECU assembly).
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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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) or Certification ECU (smart key ECU assembly).
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If the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly) is replaced, refer to Registration.
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The power back door system troubleshooting procedure is based on the premise that the smart access system with push-button start (for Entry Function) is operating normally. Check the power back door system first before troubleshooting the powerback 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 |
|---|---|---|---|---|
| Tr/B-Door Unlock SW | Back door opener switch assembly (open switch) signal | ON or OFF | ON: Back door opener switch assembly (open switch) on OFF: Back door opener switch assembly (open switch) off | - |
| Tester Display |
|---|
| Tr/B-Door Unlock SW |
OK:
On Techstream screen, item changes between ON and OFF according to above chart.
| 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) Initialize the multiplex network door ECU.
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|
| 4. | CHECK POWER BACK DOOR SYSTEM |
(a) Check power back door system operation.
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OK:
Power back door system operates normally
| OK | | END (MULTIPLEX NETWORK DOOR ECU WAS DEFECTIVE) |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 5. | INSPECT BACK DOOR OPENER SWITCH ASSEMBLY |
(a) Remove the back door opener switch assembly.
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(b) Inspect the back door opener switch assembly
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| NG | | REPLACE BACK DOOR OPENER SWITCH ASSEMBLY |
|
| 6. | CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - CERTIFICATION ECU [SMART KEY ECU ASSEMBLY]) |
(a) Disconnect the Y30 back door opener switch assembly connector.
(b) Disconnect the I52 certification ECU (smart key ECU assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Y30-1 (UL) - I52-5 (TSW5) | Always | Below 1 Ω |
| Y30-2 (E) - Body ground | Always | Below 1 Ω |
| Y30-1 (UL) or I52-5 (TSW5) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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