Lexus NX: All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch or Door Key Cylinder
DESCRIPTION
The main body ECU (multiplex network body ECU) receives switch signals from the multiplex network master switch assembly and driver door key cylinder lock or unlock switch signals from the front door lock assembly LH. The main body ECU (multiplex network body ECU) activates the door lock motor on each door according to these signals.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the vehicle power switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
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The power door lock control system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power door lock control system after confirming that the communication systems are functioning properly.
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If the main body ECU (multiplex network body ECU) is replaced, refer to the Smart Access System with Push-button Start (for Entry Function).
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PROCEDURE
| 1. | CHECK DOOR LOCK OPERATION |
(a) Check door lock operation.
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| Result | Proceed to |
|---|---|
| All doors cannot be locked by multiplex network master switch assembly | A |
| All doors cannot be locked by driver door key cylinder | B |
| B | .gif) | GO TO STEP 5 |
|
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| 2. | READ VALUE USING TECHSTREAM (LIN COMMUNICATION SYSTEM) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Master Switch / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Master Switch > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Door Lock Switch Status | Multiplex network master switch assembly lock signal | OFF or ON | OFF: Lock side of multiplex network master switch assembly not pushed ON: Lock side of multiplex network master switch assembly pushed | - |
| Door Unlock Switch Status | Multiplex network master switch assembly unlock signal | OFF or ON | OFF: Unlock side of multiplex network master switch assembly not pushed ON: Unlock side of multiplex network master switch assembly pushed | - |
| Tester Display |
|---|
| Door Lock Switch Status |
| Door Unlock Switch Status |
OK:
On the Techstream screen, ON or OFF is displayed for each item according to the table above.
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
| 3. | REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY |
(a) Replace the multiplex network master switch assembly.
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|
| 4. | CHECK DOOR LOCK OPERATION |
(a) Check that all doors can be locked and unlocked by the multiplex network master switch assembly.
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OK:
All doors can be locked and unlocked by the multiplex network master switch assembly.
| OK | | END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE) |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 5. | READ VALUE USING TECHSTREAM (Door Key SW-Lock, D Door Key SW-UL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Main Body > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Door Key SW-Lock | Driver door key-linked lock/unlock switch lock signal | OFF or ON | OFF: Driver door key cylinder not turned to lock position ON: Driver door key cylinder turned to lock position | - |
| D Door Key SW-UL | Driver door key-linked lock/unlock switch unlock signal | OFF or ON | OFF: Driver door key cylinder not turned to unlock position ON: Driver door key cylinder turned to unlock position | - |
| Tester Display |
|---|
| Door Key SW-Lock |
| D Door Key SW-UL |
OK:
On the Techstream screen, ON or OFF is displayed for each item according to the table above.
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
| 6. | INSPECT FRONT DOOR LOCK ASSEMBLY LH |
(a) Remove the front door lock assembly LH.
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(b) Inspect the front door lock assembly LH.
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| NG | | REPLACE FRONT DOOR LOCK ASSEMBLY LH |
|
| 7. | CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK ASSEMBLY LH - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] AND BODY GROUND) |
(a) Disconnect the M6 front door lock assembly LH connector.
(b) Disconnect the I48 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 |
|---|---|---|
| M6-9 (L) - I48-29 (L2) | Always | Below 1 Ω |
| M6-10 (UL) - I48-2 (UL3) | Always | Below 1 Ω |
| M6-7 (E) - Body ground | Always | Below 1 Ω |
| M6-9 (L) or I48-29 (L2) - Body ground | Always | 10 kΩ or higher |
| M6-10 (UL) or I48-2 (UL3) - 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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