Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Brake Hold Standby Indicator Light Circuit
DESCRIPTION
The brake hold standby indicator light turns on if brake hold control is possible when the following conditions required for operation standby are met and the brake hold switch (electric parking brake switch assembly) is pressed while the engine switch is on (IG).
-
Conditions required for operation standby:
- The driver door is closed.
- The driver seat belt is fastened.
- The system is normal.
HINT:
If a malfunction occurs in one of the following systems, the brake hold operated indicator light will blink. If this occurs, perform troubleshooting on the malfunctioning system.
- Brake system
- Electric parking brake system
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake actuator assembly), perform "Calibration".
Click here .gif)
PROCEDURE
| 1. | PRE-CHECK |
(a) If the brake hold standby indicator light does not illuminate even though the brake hold switch (electric parking brake switch assembly) is pushed, check that the brake hold function operation conditions are met.
- The driver door is closed.
- The driver seat belt is fastened.
- The system is normal.
HINT:
If a malfunction occurs in one of the following systems, the brake hold operated indicator light will blink. If this occurs, perform troubleshooting on the malfunctioning system.
- Brake system
- Electric parking brake system
|
.gif)
| 2. | INSPECT COMBINATION METER ASSEMBLY |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Enter the following menus: Body Electrical /Combination Meter / Active Test.
(d) Perform the Active Test of the combination meter assembly using the Techstream.
Body Electrical > Combination Meter > Active Test| Tester Display |
|---|
| Indicat. Brake Hold |
(e) Check the combination meter assembly.
OK:
The brake hold standby indicator light turns on (flashes) or off in accordance with the Techstream operation.
| NG | .gif) | INSPECT METER / GAUGE SYSTEM |
|
| 3. | INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY |
| (a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the J163 brake hold switch (electric parking brake switch assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 13 (SLT1) - 15 (GND1) | Switch pushed | Below 1 Ω |
| 13 (SLT1) - 15 (GND1) | Switch not pushed | 10 kΩ or higher |
| NG | | REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY |
|
| 4. | CHECK HARNESS AND CONNECTOR (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(b) Disconnect the A41 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J163-13 (SLT1) - A41-35 (PKB) | Always | Below 1 Ω |
| J163-13 (SLT1) or A41-35 (PKB) - Body ground | Always | 10 kΩ or higher |
| J163-15 (GND1) - Body ground | 1 minute or more after disconnecting the cable from the negative (-) battery terminal | Below 1 Ω |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Brake Hold Operated Indicator Light Circuit
DESCRIPTION The brake hold operated indicator light illuminates when the brake hold system is operating (vehicle stopped due to brake fluid pressure hold) and turns off when the brake hold system oper ...
Slip Indicator Light Remains ON
DESCRIPTION This procedure is for troubleshooting when the slip indicator light remains on but no DTCs are output. The skid control ECU (brake actuator assembly) controls the slip indicator light in t ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Power Steering System: Short in Motor Circuit (C1521-C1523,C1528,C1531-C1555)
DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition Note C1521 Short in Motor Circuit Motor overcurrent Power steering ECU assembly EPS warning light: Comes on Engine switch on (IG) again - C1522 Pow ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Navigation System: Vehicle Speed Signal Circuit between Navigation ECU and Combination Meter
DESCRIPTION The navigation ECU receives a vehicle speed signal from the combination meter assembly. HINT:
A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
0.0138