Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Back Door Closer Operation Malfunction (B2250)
DESCRIPTION
The multiplex network door ECU receives signals from the latch switch, position switch, pawl switch and back door courtesy switch, which are built into the back door lock assembly. Based on these signals, the latch position of the back door lock assembly is determined.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B2250 | Back Door Closer Operation Malfunction | While the back door closer is operating, a malfunction in the position information from the position switch is detected within a certain amount of time. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
If the multiplex network door ECU has been removed and installed or replaced, or if any of the connectors have been disconnected, initialize the power back door system.
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PROCEDURE
| 1. | READ VALUE USING TECHSTREAM |
(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 / Back Door / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Back Door > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Closer Position SW | Position switch signal | OFF or ON | OFF: Back door lock center gear out of center position (Position switch off) ON: Back door lock center gear in center position (Position switch on) | - |
| Tester Display |
|---|
| Closer Position SW |
OK:
The display is as specified in the normal condition column.
| OK | .gif) | REPLACE MULTIPLEX NETWORK DOOR ECU |
|
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| 2. | INSPECT BACK DOOR LOCK ASSEMBLY |
(a) Remove the back door lock assembly.
Click here
(b) Inspect the back door lock assembly.
Click here
| NG | | REPLACE BACK DOOR LOCK ASSEMBLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - MULTIPLEX NETWORK DOOR ECU AND BODY GROUND) |
(a) Disconnect the Z16 multiplex network door ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Z7-6 (OPN) - Z16-7 (POS) | Always | Below 1 Ω |
| Z7-7 (E) - Body ground | Always | Below 1 Ω |
| Z7-6 (OPN) or Z16-7 (POS) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE MULTIPLEX NETWORK DOOR ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Back Door Closer Switch Malfunction (B2251)
DESCRIPTION The multiplex network door ECU receives signals from the latch switch, position switch, pawl switch and back door courtesy switch, which are built into the back door lock assembly. Based o ...
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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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