Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Reverse Shift-linked Function of Power Mirrors does not Operate
DESCRIPTION
The ECM sends the reverse signal to the main body ECU (multiplex network body ECU) via CAN communication. When receiving the reverse signal, the main body ECU (multiplex network body ECU) sends the reverse request signal to each outer mirror control ECU assembly. Based on the signal, each outer mirror control ECU assembly then performs control.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
The power mirror control system (w/o Memory) uses the CAN communication system. First, confirm that there is no malfunction in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.
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Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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HINT:
The reverse shift-linked function will not activate when both the mirror select switch L and R switch are off.
PROCEDURE
| 1. | CHECK ELECTRICAL REMOTE CONTROL MIRROR FUNCTION |
(a) Turn the power switch on (IG).
(b) With the mirror select switch L switch on, check that the outer rear view mirror assembly LH surface moves up, down, left and right normally.
(c) With the mirror select switch R switch on, check that the outer rear view mirror assembly RH surface moves up, down, left and right normally.
| Result | Proceed to |
|---|---|
| Electrical remote control mirror function is normal | A |
| Electrical remote control mirror function is not normal | B |
| B | .gif) | GO TO PROBLEM SYMPTOMS TABLE |
|
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| 2. | CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / DTC.
(e) Check if SFI system DTCs are output.
Powertrain > Engine > Trouble CodesOK:
SFI system DTCs are not output.
| NG | | GO TO SFI SYSTEM |
|
| 3. | CHECK COMBINATION METER ASSEMBLY |
(a) Check if the shift position indicator light in the combination meter assembly operates normally.
OK:
Shift position indicator light indicates the actual shift position correctly.
| NG | | GO TO METER / GAUGE SYSTEM |
|
| 4. | CHECK REVERSE SHIFT-LINKED FUNCTION |
| (a) Turn the engine switch on (IG). |
|
(b) Turn the mirror select switch R or L switch on.
(c) Check that the mirror surface turns downward when the shift lever is moved to R.
| Result | Proceed to |
|---|---|
| Reverse shift-linked functions on both mirrors are not normal | A |
| Reverse shift-linked function on driver door is not normal | B |
| Reverse shift-linked function on front passenger door is not normal | C |
| B | | REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) |
| C | | REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER DOOR) |
|
| 5. | 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 | - |
| Tester Display |
|---|
| Mirror Selection SW (L) |
| Mirror Selection SW (R) |
OK:
On the Techstream screen, ON or OFF is displayed accordingly.
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 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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