Anti-Lock Brake System Brake Warning Light Remains On

Brake. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
Brake Control Dynamic Control Systems. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT BRAKE FLUID LEVEL WARNING SWITCH

INSPECT PARKING BRAKE SWITCH ASSEMBLY

INSPECT VACUUM WARNING SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (BRAKE WARNING LIGHT CIRCUIT)

INSPECT SKID CONTROL ECU (PKB INTERNAL CIRCUIT)

ANTI-LOCK BRAKE SYSTEM - Brake Warning Light Remains ON


DESCRIPTION

When one of the following conditions is met, the brake warning light remains on:
  1. The brake fluid level is insufficient.
  2. The parking brake is applied.
  3. The vacuum inside the brake booster decreases (for 1KD-FTV and 2KD-FTV).
  4. The PKB terminal circuit is shorted.

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Anti-Lock Brake System Brake Warning Light Remains On


INSPECTION PROCEDURE

NOTICE:
  1. for 1KD-FTV and 2KD-FTV:
    If there is a brake booster system malfunction, such as a problem with the response of the brake pedal when it is depressed, inspect the brake booster system first.
    1. For brake booster inspection:
      1. On-vehicle inspection:
      2. for TMT Made: HILUX_TGN26 RM0000010KJ00YX.html
      3. for TASA Made: HILUX_TGN26 RM0000010KJ013X.html
      4. for TDV Made: HILUX_TGN26 RM0000010KJ01DX.html
      5. for TSAM Made: HILUX_TGN26 RM0000010KJ01EX.html
      6. Inspection:
      7. for TMT Made: HILUX_TGN26 RM000004QMH002X.html
      8. for TASA Made: HILUX_TGN26 RM000004Z5O000X.html
      9. for TDV Made: HILUX_TGN26 RM000004QMH004X.html
      10. for TSAM Made: HILUX_TGN26 RM000004Z5O001X.html
    1. For vacuum pump inspection:
      1. On-vehicle inspection: HILUX_TGN26 RM0000010KP014X.html
      2. Inspection: HILUX_TGN26 RM0000010LK00ZX.html
  2. Before disconnecting the connector, make sure that there are no problems with the connection.
  3. After disconnecting the connector, make sure that the connector case and terminals are not deformed or corroded.
1.INSPECT BRAKE FLUID LEVEL WARNING SWITCH

  1. Turn the ignition switch to ON.

  1. With the brake fluid at the specified level, disconnect the brake fluid level warning switch (brake master cylinder reservoir sub-assembly) connector and check the brake warning light.

    Result
    Result
    		Proceed to
    Brake warning light does not turn off
    		A
    Brake warning light turns off (for TMT Made)
    		B
    Brake warning light turns off (for TASA Made)
    		C
    Brake warning light turns off (for TDV Made)
    		D
    Brake warning light turns off (for TSAM Made)
    		E
    HINT:
    If the brake warning light turns off, the brake fluid level warning switch (brake master cylinder reservoir sub-assembly) has an internal short circuit.


B
REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY (HILUX_TGN26 RM000001HK901YX.html)

C
REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY (HILUX_TGN26 RM0000010KE01FX.html)

D
REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY (HILUX_TGN26 RM000004QL4005X.html)

E
REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY (HILUX_TGN26 RM0000010KE01LX.html)
A


2.INSPECT PARKING BRAKE SWITCH ASSEMBLY

  1. Turn the ignition switch off.

  1. Remove the parking brake switch (HILUX_TGN26 RM000001C4X01LX.html).

  1. Inspect the parking brake switch (HILUX_TGN26 RM000001C4V01MX.html).

    Result
    Result
    		Proceed to
    OK (for 1KD-FTV and 2KD-FTV)
    		A
    OK (except 1KD-FTV and 2KD-FTV)
    		B
    NG
    		C


B
Go to step 4

C
REPLACE PARKING BRAKE SWITCH ASSEMBLY (HILUX_TGN26 RM000001C4X01LX.html)
A


3.INSPECT VACUUM WARNING SWITCH ASSEMBLY

  1. Start the engine.

  1. Idle the engine.

  1. Disconnect the vacuum warning switch connector and check the brake warning light.

    Result
    Result
    		Proceed to
    Brake warning light does not turn off
    		A
    Brake warning light turns off (for TMT Made)
    		B
    Brake warning light turns off (for TASA Made)
    		C
    Brake warning light turns off (for TDV Made)
    		D
    Brake warning light turns off (for TSAM Made)
    		E
    HINT:
    If the brake warning light turns off, the vacuum warning switch has an internal short circuit.


B
REPLACE VACUUM WARNING SWITCH ASSEMBLY (HILUX_TGN26 RM0000010KI01DX.html)

C
REPLACE VACUUM WARNING SWITCH ASSEMBLY (HILUX_TGN26 RM0000010KI01IX.html)

D
REPLACE VACUUM WARNING SWITCH ASSEMBLY (HILUX_TGN26 RM0000010KI01TX.html)

E
REPLACE VACUUM WARNING SWITCH ASSEMBLY (HILUX_TGN26 RM0000010KI01UX.html)
A


4.CHECK HARNESS AND CONNECTOR (BRAKE WARNING LIGHT CIRCUIT)

  1. Turn the ignition switch off.

  1. Disconnect the skid control ECU (brake actuator assembly) connector.

  1. Disconnect the G19 combination meter connector.

  1. Disconnect the parking brake switch connector.

  1. Disconnect the brake fluid level warning switch (brake master cylinder reservoir sub-assembly) connector.

  1. for 1KD-FTV and 2KD-FTV:
    Disconnect the vacuum warning switch connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A13-18 (PKB) - G19-36 (SW)
    		Always
    		Below 1 Ω
    A13-18 (PKB) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT SKID CONTROL ECU (PKB INTERNAL CIRCUIT)

  1. Turn the ignition switch off.

  1. Release the parking brake.

  1. Start the engine.

  1. Disconnect the skid control ECU (brake actuator assembly) connector and check the brake warning light.

    Result
    Result
    		Proceed to
    Brake warning light does not turn off
    		A
    Brake warning light turns off
    		B
    HINT:
    If the brake warning light turns off, the skid control ECU (brake actuator assembly) has an internal short circuit.


B
REPLACE BRAKE ACTUATOR ASSEMBLY (HILUX_TGN26 RM0000010K001CX.html)
A

GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (HILUX_TGN26 RM000002Z4L02SX.html)