Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Mirror Heater does not Operate with Rear Defogger Switch
DESCRIPTION
When the mirror heater switch (rear window defogger switch) is operated, the mirror heater signal is sent to the air conditioning amplifier assembly and then to each outer mirror control ECU assembly via CAN communication. Based on this signal, the outer mirror control ECU assemblies operate the mirror heaters.
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.
Click here
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If the battery voltage is low, the mirror heater function may not operate. When "Operation of Electrical Items Restricted." is not displayed on the multi-information display in the combination meter assembly, check the Data List item "Battery Control Count (Body ECU)".
Click here
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here
PROCEDURE
| 1. | CHECK WINDOW DEFOGGER SYSTEM |
(a) Check window defogger system operation.
Click here
OK:
Window defogger system is normal.
| NG | .gif) | GO TO WINDOW DEFOGGER SYSTEM |
|
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| 2. | PERFORM ACTIVE TEST 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 / Mirror L or Mirror R / Active Test.
(e) Perform an Active Test according to the display on the Techstream.
Body Electrical > Mirror L > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Mirror Heater | Mirror heater operation | OFF or ON |
|
| Tester Display |
|---|
| Mirror Heater |
| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Mirror Heater | Mirror heater operation | OFF or ON |
|
| Tester Display |
|---|
| Mirror Heater |
| Result | Proceed to |
|---|---|
| Mirror heater operation on both mirrors is normal | A |
| Mirror heater operation on driver door mirror is not normal | B |
| Mirror heater operation on front passenger door mirror is not normal | C |
| A | | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
| C | | GO TO STEP 5 |
|
| 3. | INSPECT OUTER REAR VIEW MIRROR ASSEMBLY (DRIVER DOOR) (MIRROR HEATER) |
(a) Remove the outer rear view mirror assembly (driver door).
Click here
(b) Remove the outer rear view mirror assembly (driver door) (mirror heater).
Click here
| OK | | REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) |
|
| 4. | INSPECT OUTER MIRROR (DRIVER DOOR) |
(a) Remove the outer mirror (driver door).
Click here
(b) Inspect the outer mirror (driver door).
Click here
| OK | | REPLACE OUTER REAR VIEW MIRROR ASSEMBLY (DRIVER DOOR) |
| NG | | REPLACE OUTER MIRROR (DRIVER DOOR) |
| 5. | INSPECT OUTER REAR VIEW MIRROR ASSEMBLY (FRONT PASSENGER DOOR) (MIRROR HEATER) |
(a) Remove the outer rear view mirror assembly (front passenger door).
Click here
(b) Remove the outer rear view mirror assembly (front passenger door) (mirror heater).
Click here
| OK | | REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER DOOR) |
|
| 6. | INSPECT OUTER MIRROR (FRONT PASSENGER DOOR) |
(a) Remove the outer mirror (front passenger door).
Click here
(b) Inspect the outer mirror (front passenger door).
Click here
| OK | | REPLACE OUTER REAR VIEW MIRROR ASSEMBLY (FRONT PASSENGER DOOR) |
| NG | | REPLACE OUTER MIRROR (FRONT PASSENGER DOOR) |
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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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