Lexus NX: Driver Side Power Mirror cannot be Adjusted with Power Mirror Switch
DESCRIPTION
When the outer mirror switch assembly mirror surface adjust switch (up/down/left/right) is operated, up/down/left/right signals are received by the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) sends the received signals to the outer mirror control ECU assembly LH via CAN communication. The outer mirror control ECU assembly LH receives the remote mirror selection signal and up/down/left/right signals and operates the outer rear view mirror assembly LH up/down/left/right based on the signals.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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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.
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If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.
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PROCEDURE
| 1. | READ VALUE USING TECHSTREAM (OUTER MIRROR SWITCH ASSEMBLY) |
(a) Using the Techstream, read the Data List.
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| 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 (R) | Mirror surface adjust switch signal (Right) | OFF or ON | OFF: Mirror surface adjust switch not pressed right ON: Mirror surface adjust switch pressed right | Check with the mirror select switch L switch on |
| Mirror Position SW (L) | Mirror surface adjust switch signal (Left) | OFF or ON | OFF: Mirror surface adjust switch not pressed left ON: Mirror surface adjust switch pressed left | Check with the mirror select switch L switch on |
| Mirror Position SW (Up) | Mirror surface adjust switch signal (Up) | OFF or ON | OFF: Mirror surface adjust switch not pressed up ON: Mirror surface adjust switch pressed up | Check with the mirror select switch L switch on |
| Mirror Position SW (Dwn) | Mirror surface adjust switch signal (Down) | OFF or ON | OFF: Mirror surface adjust switch not pressed down ON: Mirror surface adjust switch pressed down | Check with the mirror select switch L switch on |
| Tester Display |
|---|
| Mirror Selection SW (L) |
| Mirror Position SW (R) |
| Mirror Position SW (L) |
| Mirror Position SW (Up) |
| Mirror Position SW (Dwn) |
OK:
The display is as specified in the normal condition column.
| NG | .gif) | GO TO STEP 3 |
|
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| 2. | INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH |
(a) Remove the outer rear view mirror assembly LH.
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(b) Inspect the outer rear view mirror assembly LH.
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| OK | | REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH |
| NG | | REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH |
| 3. | INSPECT OUTER MIRROR SWITCH ASSEMBLY |
(a) Remove the outer mirror switch assembly.
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(b) Inspect the outer mirror switch assembly.
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| NG | | REPLACE OUTER MIRROR SWITCH ASSEMBLY |
|
| 4. | CHECK HARNESS AND CONNECTOR (OUTER MIRROR SWITCH ASSEMBLY - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU]) |
(a) Disconnect the M13 outer mirror switch assembly connector.
(b) Disconnect the I49 main body ECU (multiplex network body ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| M13-13 (M+) - I49-4 (MIRB) | Always | Below 1 Ω |
| M13-14 (MSW) - I49-5 (MIRS) | Always | Below 1 Ω |
| M13-12 (E) - I49-6 (MIRE) | Always | Below 1 Ω |
| M13-13 (M+) or I49-4 (MIRB) - Body ground | Always | 10 kΩ or higher |
| M13-14 (MSW) or I49-5 (MIRS) - Body ground | Always | 10 kΩ or higher |
| M13-12 (E) or I49-6 (MIRE) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Use the same procedure for the RH and LH sides.
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