Toyota CH-R Service Manual: Brake Hold Standby Indicator Light Circuit

DESCRIPTION

When the brake hold switch (electric parking brake switch assembly) is turned on with the ignition switch turned to ON, the brake hold standby indicator light illuminates when brake hold operation is possible.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.

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's door is closed.
  2. Driver's seat belt is fastened.
  3. The engine hood is closed.
  4. The back door is closed.
  5. The system is normal.
NEXT

2.

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

CHECK CAN COMMUNICATION SYSTEM

A

3.

CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED

(a) Jiggle the skid control ECU (brake actuator assembly) connectors and wire harnesses vertically and horizontally and check the brake hold standby indicator light status.

OK:

The connector is securely connected.

NG

CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY

OK

4.

INSPECT COMBINATION METER ASSEMBLY

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch off.

(c) Perform the Active Test of the combination meter assembly using the Techstream.

Click here

Body Electrical > Combination Meter > Active Test

Tester Display

Indicat. Brake Hold

(d) Check the combination meter assembly.

OK:

The brake hold standby indicator light turns on or off in accordance with the Techstream operation.

NG

INSPECT METER / GAUGE SYSTEM

OK

5.

PERFORM ACTIVE TEST USING TECHSTREAM (BRAKE HOLD STANDBY INDICATOR LIGHT)

(a) Turn the ignition switch to ON.

(b) Select the Active Test on the Techstream.

Click here

Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

BH Standby Light

Brake hold standby indicator light

Indicator light ON/OFF

Observe combination meter

(c) Select the Data List on the Techstream.

Click here

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

BH Standby Light

Brake hold standby indicator light

ON or OFF

ON: Indicator light on

OFF: Indicator light off

-

Chassis > ABS/VSC/TRAC/EPB > Active Test

Active Test Display

BH Standby Light

Data List Display

BH Standby Light

(d) Check the operating condition of the brake hold standby indicator light when operating it using the Techstream.

Result

Proceed to

Brake hold standby indicator light in the Data List does not change using the Active Test.

A

Brake hold standby indicator light in the Data List turns ON/OFF using the Active Test.

B

A

REPLACE BRAKE ACTUATOR ASSEMBLY

B

6.

INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

(a) Inspect the electric parking brake switch assembly.

Click here

NG

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

OK

7.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

(a) Disconnect the A42 skid control ECU (brake actuator assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A42-43 (HZRI) - F67-12 (+B)

Always

Below 1 Ω

A42-43 (HZRI) or F67-12 (+B) - Body ground

Always

10 kΩ or higher

F67-8 (E) - Body ground

Always

Below 1 Ω

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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