Lexus NX: Mirror Heater does not Operate with Rear Defogger Switch
DESCRIPTION
When therear window defogger switch (mirror heater switch) is operated, a mirror heater signal is sent to the air conditioning amplifier assembly via LIN communication. The air conditioning amplifier assembly sends the signal to the outer mirror control ECU assembly via CAN communication. The outer mirror control ECU assembly operates the outer rear view mirror assembly mirror heater based on the received signal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this problem.
Click here
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First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no LIN communication malfunctions before troubleshooting this problem.
Click here
-
If the auxiliary battery voltage becomes low, mirror heater operation is canceled to prioritize supplying power to the power steering system.
for Manual Tilt and Manual Telescopic Steering Column: Click here
for Power Tilt and Power Telescopic Steering Column: Click here
PROCEDURE
| 1. | CHECK POWER STEERING SYSTEM |
(a) Check the power steering system operation.
for Manual Tilt and Manual Telescopic Steering Column: Click here
for Power Tilt and Power Telescopic Steering Column: Click here
OK:
Power steering system is normal.
| NG | .gif) | GO TO POWER STEERING SYSTEM |
|
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| 2. | CHECK WINDOW DEFOGGER SYSTEM |
(a) Check the window defogger system operation.
Click here
OK:
Window defogger system is normal.
| NG | | GO TO WINDOW DEFOGGER SYSTEM |
|
| 3. | PERFORM ACTIVE TEST USING TECHSTREAM (MIRROR HEATER FUNCTION) |
(a) Using the Techstream, perform the Active Test.
Click here
(1) for LH side
Body Electrical > Mirror L > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Mirror Heater | Mirror heater operation | - | - |
| Tester Display |
|---|
| Mirror Heater |
(2) for RH side
Body Electrical > Mirror R > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Mirror Heater | Mirror heater operation | OFF or ON | - |
| Tester Display |
|---|
| Mirror Heater |
OK:
Mirror heater operates normally.
| Result | Proceed to |
|---|---|
| Mirror heater operation of both mirrors are normal | A |
| Mirror heater operation of LH side mirror is not normal | B |
| Mirror heater operation of RH side mirror is not normal | C |
| A | | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
| C | | GO TO STEP 6 |
|
| 4. | INSPECT OUTER MIRROR RETRACTOR LH |
(a) Remove the outer rear view mirror assembly LH.
Click here
(b) Inspect the outer mirror retractor LH.
Click here
| OK | | REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH |
|
| 5. | INSPECT OUTER MIRROR LH |
(a) Remove the outer mirror LH.
Click here
(b) Inspect the outer mirror LH.
Click here
| OK | | REPLACE OUTER MIRROR RETRACTOR LH |
| NG | | REPLACE OUTER MIRROR LH |
| 6. | INSPECT OUTER MIRROR RETRACTOR RH |
(a) Remove the outer rear view mirror assembly RH.
Click here
(b) Inspect the outer mirror retractor RH.
Click here
| OK | | REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY RH |
|
| 7. | INSPECT OUTER MIRROR RH |
(a) Remove the outer mirror RH.
Click here
(b) Inspect the outer mirror RH.
Click here
| OK | | REPLACE OUTER MIRROR RETRACTOR RH |
| NG | | REPLACE OUTER MIRROR RH |
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