Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: 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 front door lock with motor 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:
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Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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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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PROCEDURE
| 1. | CHECK DOOR LOCK OPERATION |
(a) Check door lock operation.
Click here
| 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. | CHECK FOR DTC (LIN COMMUNICATION SYSTEM) |
(a) Clear the DTCs.
Click here
(b) Recheck for DTCs.
Body Electrical > Main Body > Trouble CodesOK:
DTC B1206 is not output.
| NG | | GO TO LIN COMMUNICATION SYSTEM (DTC B1206) |
|
| 3. | REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY |
(a) Replace the multiplex network master switch assembly.
Click here
|
| 4. | CHECK DOOR LOCK OPERATION |
(a) Check that all doors can be locked and unlocked by the multiplex network master switch assembly.
Click here
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 engine 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 | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
| 6. | INSPECT FRONT DOOR LOCK WITH MOTOR ASSEMBLY |
(a) Remove the front door lock with motor assembly LH.
Click here
(b) Inspect the front door lock with motor assembly LH.
Click here
| NG | | REPLACE FRONT DOOR LOCK WITH MOTOR ASSEMBLY |
|
| 7. | CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK WITH MOTOR ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) |
(a) Disconnect the J8 main body ECU (multiplex network body ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| N8-9 (L) - J8-29 (L2) | Always | Below 1 Ω |
| N8-10 (UL) - J8-2 (UL3) | Always | Below 1 Ω |
| N8-7 (E) - Body ground | Always | Below 1 Ω |
| N8-9 (L) or J8-29 (L2) - Body ground | Always | 10 kΩ or higher |
| N8-10 (UL) or J8-2 (UL3) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Power Door Lock Control System DTC No. Detection Item INF Code DTC Detection Condition Trouble Area MIL Warning Indicate Memory DTC Output from Test ...
GSW Terminal Circuit Malfunction (B1243)
DESCRIPTION If the collision door lock release function does not operate normally, or an open or short in the GSW input circuit of the main body ECU (multiplex network body ECU) is detected, DTC B1243 ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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