Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Power Mirror cannot be Adjusted with Power Mirror Switch
DESCRIPTION
The multiplex network master switch assembly sends the mirror adjust switch signals to the main body ECU (multiplex network body ECU) via LIN communication. The main body ECU (multiplex network body ECU) then sends the received mirror adjust switch signals to each outer mirror control ECU assembly via CAN communication. Based on this signal, each outer mirror control ECU assembly operates the vertical and horizontal mirror motors to adjust the mirror surface position.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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The power mirror control system (w/o Memory) uses the CAN communication system and LIN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the power window control system after confirming that the communication systems are functioning properly.
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Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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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 / 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 |
|---|---|---|---|---|
| Mirror Selection SW (L) | Mirror select switch signal for LH mirror | OFF or ON | OFF: Mirror select switch off ON: Mirror select switch L switch on | - |
| Mirror Selection SW (R) | Mirror select switch signal for RH mirror | OFF or ON | OFF: Mirror select switch off ON: Mirror select switch R switch on | - |
| Mirror Position SW (L) | Mirror adjust switch signal (Left) | OFF or ON | OFF: Mirror adjust switch not pressed left ON: Mirror adjust switch pressed left | Check with the mirror select switch L or R switch on |
| Mirror Position SW (R) | Mirror adjust switch signal (Right) | OFF or ON | OFF: Mirror adjust switch not pressed right ON: Mirror adjust switch pressed right | Check with the mirror select switch L or R switch on |
| Mirror Position SW (Up) | Mirror adjust switch signal (Up) | OFF or ON | OFF: Mirror adjust switch not pressed up ON: Mirror adjust switch pressed up | Check with the mirror select switch L or R switch on |
| Mirror Position SW (Dwn) | Mirror adjust switch signal (Down) | OFF or ON | OFF: Mirror adjust switch not pressed down ON: Mirror adjust switch pressed down | Check with the mirror select switch L or R switch on |
| Tester Display |
|---|
| Mirror Selection SW (L) |
| Mirror Selection SW (R) |
| Mirror Position SW (L) |
| Mirror Position SW (R) |
| Mirror Position SW (Up) |
| Mirror Position SW (Dwn) |
OK:
On the Techstream screen, ON or OFF is displayed accordingly.
| NG | .gif) | REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY |
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| 2. | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
(a) Temporarily replace the main body ECU (multiplex network body ECU) with a new or known good one.
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|
| 3. | CHECK POWER MIRROR CONTROL OPERATION |
(a) Check the electrical remote control mirror function.
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OK:
Electrical remote control mirror function operates normally.
| OK | | END (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) WAS DEFECTIVE) |
| NG | | REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY |
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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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