Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Driver Side 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 the outer mirror control ECU assembly (driver door) via CAN communication. On receiving the signal, the outer mirror control ECU assembly (driver door) operates the vertical and horizontal mirror motors, which are built into the outer rear view mirror assembly (driver door), 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.
Click here
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Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here
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 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 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) | GO TO STEP 4 |
|
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| 2. | INSPECT OUTER REAR VIEW MIRROR ASSEMBLY (DRIVER DOOR) (MIRROR SURFACE) |
(a) Remove the outer rear view mirror assembly (driver door).
Click here
(b) Inspect the outer rear view mirror assembly (driver door) (mirror surface).
Click here
| Result | Proceed to |
|---|---|
| OK | A |
| NG (ecxept TMMC Made) | B |
| NG (for TMMC Made) | C |
| A | | REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) |
| B | | REPLACE OUTER REAR VIEW MIRROR ASSEMBLY (DRIVER DOOR) |
|
| 3. | INSPECT OUTER REAR VIEW MIRROR ASSEMBLY (DRIVER DOOR) (WIRE HARNESS) |
(a) Remove the outer mirror actuator assembly (driver door).
Click here
(b) Disconnect the z12 outer mirror control ECU assembly (driver door) connector.
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| OK | | REPLACE OUTER MIRROR ACTUATOR ASSEMBLY (DRIVER DOOR) |
| NG | | REPLACE OUTER REAR VIEW MIRROR ASSEMBLY (DRIVER DOOR) |
| 4. | REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY |
(a) Temporarily replace the multiplex network master switch assembly with a new or known good one.
Click here
|
| 5. | CHECK POWER MIRROR CONTROL OPERATION |
(a) Check the electrical remote control mirror function.
Click here
OK:
Electrical remote control mirror function operates normally.
| OK | | END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE) |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
Lost Communication with Main Body ECU (U0142)
DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area U0142 Lost Communication with Main Body ECU No communication with main body ECU (multiplex network body ECU) ...
Front Passenger Side 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 ne ...
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*: Use the Techstream.
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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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