Lexus RX (RX 350L, RX450h) 2016-2022 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:
    1. The driver door is closed.
    2. The driver seat belt is fastened.
    3. 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

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.

  1. The driver door is closed.
  2. The driver seat belt is fastened.
  3. 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
NEXT

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

INSPECT METER / GAUGE SYSTEM

OK

3.

INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

(a) Turn the engine switch off.

*a

Component without harness connected

(Brake Hold Switch (Electric Parking Brake Switch Assembly))

(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

OK

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

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