Lexus NX: ABS 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 (ABS WARNING LIGHT) |
(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 |
|---|---|---|---|
| ABS Warning Light | ABS warning light | Warning light ON/OFF | Observe combination meter assembly |
(d) Select the Data List on the Techstream.
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| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| ABS Warning Light | ABS warning light | ON or OFF | ON: Warning light on OFF: Warning light off | - |
| Active Test Display |
|---|
| ABS Warning Light |
| Data List Display |
|---|
| ABS Warning Light |
(e) Check the operating condition of the ABS warning light when operating it using the Techstream.
| Result | Proceed to |
|---|---|
| ABS warning light in the Data List does not change using the Active Test. | A |
| ABS warning light 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 ABS |
(c) Check the combination meter assembly.
OK:
The ABS warning light 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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Terminals Of Ecu
TERMINALS OF ECU CHECK DCM (TELEMATICS TRANSCEIVER) Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition I183-1 (+B) - I183-20 (E) Y - W-B Power source (+B) Power switch off 11 to 14 V I183-3 (SIG-) - I183-20 (E) G - W-B Ground Alway
