Lexus NX: Power Back Door Warning System does not Operate
DESCRIPTION
When the power back door warning system does not operate, one of the following may be malfunctioning: 1) wireless door lock control system, 2) power back door warning buzzer circuit or 3) 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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-
The power back door warning function can be customized. Make sure the function is ON.
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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. | CHECK OPERATION |
(a) Check power back door system operation.
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| Result | Proceed to |
|---|---|
| Hazard warning light does not come on (w/ Power Back Door Hazard Warning Light) | A |
| Power back door warning buzzer does not operate | B |
| B | .gif) | GO TO STEP 6 |
|
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| 2. | CHECK WIRELESS DOOR LOCK CONTROL SYSTEM (HAZARD ANSWER-BACK FUNCTION) |
(a) Check wireless door lock operation.
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OK:
Hazard answer-back function operates normally
| NG | | GO TO WIRELESS DOOR LOCK CONTROL SYSTEM |
|
| 3. | REPLACE MULTIPLEX NETWORK DOOR ECU |
(a) Temporarily replace the multiplex network door ECU with a new or normally functioning one.
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|
| 4. | INITIALIZE MULTIPLEX NETWORK DOOR ECU |
(a) Perform the initialization for the multiplex network door ECU.
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|
| 5. | CHECK POWER BACK DOOR SYSTEM |
(a) Check that the power back door hazard warning lights operate normally.
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OK:
The power back door hazard warning lights operate normally
| OK | | END (MULTIPLEX NETWORK DOOR ECU WAS DEFECTIVE) |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 6. | PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Check the Data List for proper functioning of the wireless door lock buzzer.
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| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| PBD Buzzer | Power back door warning buzzer sound | ON or OFF | - |
| Tester Display |
|---|
| PBD Buzzer |
OK:
Power back door warning buzzer sounds
| OK | | REPLACE MULTIPLEX NETWORK DOOR ECU |
|
| 7. | CHECK HARNESS AND CONNECTOR (POWER BACK DOOR WARNING BUZZER - MULTIPLEX NETWORK DOOR ECU AND BODY GROUND) |
(a) Disconnect the Y14 power back door warning buzzer 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 |
|---|---|---|
| Y14-1 (BZR+) - Y26-16 (BZR+) | Always | Below 1 Ω |
| Y14-2 (BZR-) - Body ground | Always | Below 1 Ω |
| Y14-1 (BZR+) or Y26-16 (BZR+) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 8. | REPLACE POWER BACK DOOR WARNING BUZZER |
(a) Temporarily replace the power back door warning buzzer with a new or normally functioning one.
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|
| 9. | CHECK POWER BACK DOOR SYSTEM |
(a) Check that the power back door warning buzzer operates normally.
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OK:
Power back door warning buzzer sounds
| OK | | END (POWER BACK DOOR WARNING BUZZER WAS DEFECTIVE) |
| NG | | REPLACE MULTIPLEX NETWORK DOOR ECU |
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