Lexus NX: Driver Side Power Window does not Operate with Power Window Master Switch
DESCRIPTION
When the power switch is on (IG), the front power window regulator motor assembly LH is operated by the multiplex network master switch assembly. The front power window regulator motor assembly LH has motor, regulator and ECU functions.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
The power window control system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power window control system after confirming that the communication system is functioning properly.
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If the front power window regulator motor assembly LH has been replaced with a new one, initialize the power window control system.
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- Inspect the fuses for circuits related to this system before performing the following procedure.
- Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
-
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.
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PROCEDURE
| 1. | READ VALUE USING TECHSTREAM (MAIN BODY) |
(a) Read the Data List according to the display on the Techstream.
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| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Communication D-Door Motor | Connection status between front power window regulator motor assembly LH and main body ECU (multiplex network body ECU) | STOP or OK | STOP: Communication stopped OK: Normal communication | - |
| Communication Master SW | Connection status between multiplex network master switch assembly and main body ECU (multiplex network body ECU) | STOP or OK | STOP: Communication stopped OK: Normal communication | - |
| Tester Display |
|---|
| Communication D-Door Motor |
| Communication Master SW |
OK:
On the Techstream screen, OK is displayed.
| NG | .gif) | GO TO LIN COMMUNICATION SYSTEM |
|
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| 2. | READ VALUE USING TECHSTREAM (D-DOOR MOTOR) |
(a) Read the Data List according to the display on the Techstream.
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| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| D Door P/W Up SW | Driver door power window manual up switch signal | OFF or ON | OFF: Driver door power window manual up switch not being operated ON: Driver door power window manual up switch being operated | - |
| D Door P/W Down SW | Driver door power window manual down switch signal | OFF or ON | OFF: Driver door power window manual down switch not being operated ON: Driver door power window manual down switch being operated | - |
| Tester Display |
|---|
| D Door P/W Up SW |
| D Door P/W Down SW |
OK:
On the Techstream screen, ON or OFF is displayed accordingly.
| NG | | GO TO STEP 4 |
|
| 3. | PERFORM ACTIVE TEST USING TECHSTREAM (D-DOOR MOTOR) |
(a) Perform the Active Test according to the display on the Techstream.
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CAUTION:
Be careful to avoid injuries as this test causes vehicle parts to move. During the Active Test, the jam protection function will not operate.
Body Electrical > D-Door Motor > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Power Window | Power window | OFF / DOWN / UP | - |
| Tester Display |
|---|
| Power Window |
HINT:
Up and down movement does not occur if the arrow is not pressed and held.
OK:
Driver door power window operates normally.
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH |
| 4. | CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH) |
(a) Disconnect the M10 multiplex network master switch assembly connector.
(b) Disconnect the M2 front power window regulator motor assembly LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| M10-20 (UP) - M2-10 (UP) | Always | Below 1 Ω |
| M10-15 (DOWN) - M2-7 (DOWN) | Always | Below 1 Ω |
| M10-20 (UP) or M2-10 (UP) - Body ground | Always | 10 kΩ or higher |
| M10-15 (DOWN) or M2-7 (DOWN) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY |
(a) Replace the multiplex network master switch assembly.
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|
| 6. | CHECK MANUAL UP / DOWN FUNCTION (FOR DRIVER DOOR) |
(a) Check that the driver door power window moves when the manual up and down function of the power window regulator master switch assembly is operated.
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OK:
Driver door manual up and down function is normal.
| OK | | END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE) |
| NG | | REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH |
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