Lexus NX: Brake Control Warning Light does not Come ON
DESCRIPTION
The skid control ECU (brake booster with master cylinder assembly) is connected to the combination meter assembly via CAN communication.
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.
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PROCEDURE
| 1. | CHECK CAN COMMUNICATION SYSTEM |
(a) Check if CAN communication system DTCs are output.
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| Result | Proceed to |
|---|---|
| DTCs are not output. | A |
| DTCs are output. | B |
| B | .gif) | INSPECT CAN COMMUNICATION SYSTEM |
|
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| 2. | PERFORM ACTIVE TEST USING TECHSTREAM (BRAKE WARNING LIGHT / YELLOW (MINOR MALFUNCTION)) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the Active Test on the Techstream.
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| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| ECB Warning Light | Brake warning light / yellow (minor malfunction) | Warning light ON/OFF |
|
(d) Select the Data List on the Techstream.
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| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| ECB Warning Light | Brake warning light / yellow (minor malfunction) | ON or OFF | ON: Warning light on OFF: Warning light off | ECB: Electronically Controlled Brake System |
| Active Test Display |
|---|
| ECB Warning Light |
| Data List Display |
|---|
| ECB Warning Light |
(e) Check the operating condition of the brake warning light / yellow (minor malfunction) when operating it using the Techstream.
| Result | Proceed to |
|---|---|
| Brake warning light / yellow (minor malfunction) in the Data List does not change using the Active Test. | A |
| Brake warning light / yellow (minor malfunction) in the Data List turns ON/OFF using the Active Test. | B |
| A | | REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
|
| 3. | INSPECT COMBINATION METER ASSEMBLY |
(a) Turn the power switch off.
(b) Perform the Active Test of the combination meter assembly (meter CPU) using the Techstream.
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| Tester Display |
|---|
| Indicat. Lamp ECB |
(c) Check the combination meter assembly.
OK:
The brake warning light / yellow (minor malfunction) turns on or off in accordance with the Techstream operation.
| OK | | REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
| NG | | INSPECT METER / GAUGE SYSTEM |
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Parts Location
PARTS LOCATION ILLUSTRATION *A w/ Rain Sensor *B w/ Sliding Roof System *C w/ Hands Free Power Back Door - - *1 FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH *2 FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY RH *3 REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY LH *4
Disassembly
DISASSEMBLY PROCEDURE 1. PRECAUTION NOTICE:
Be sure to read Precaution thoroughly before servicing.
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Handle components indoors as much as possible to prevent foreign matter from entering and adhering to fog light assembly components.
Do not reuse parts which have reduced fastening
