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.
Click here
| 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.
Click here
| 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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SEE MORE:
Removal
REMOVAL PROCEDURE 1. REMOVE REAR SEAT ASSEMBLY (for Manual Seat) Click here 2. REMOVE REAR SEAT ASSEMBLY (for Power Seat) Click here 3. REMOVE TONNEAU COVER ASSEMBLY Click here 4. REMOVE DECK BOARD ASSEMBLY Click here 5. REMOVE NO. 2 DECK BOARD SUB-ASSEMBLY Click here 6. REMOVE NO. 3 DE
Dtc Check / Clear
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