Inspection Procedure

NOTE: When replacing the brake actuator assembly, perform zero point CALIBRATION .

HINT:

When C1425 and/or C1426 is output together with C1380, inspect and repair the trouble areas indicated by C1425 and/or C1426 first.

CHECK STOP LIGHT OPERATION

Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

STOP LIGHT ILLUMINATION CONDITION TABLE

Condition	Illumination Condition
Brake pedal depressed	ON
Brake pedal released	OFF

NG: INSPECT STOP LIGHT CIRCUIT (See PROBLEM SYMPTOMS TABLE )

OK: Go to next step

READ VALUE ON TECHSTREAM (STOP LIGHT SWITCH)

Connect Techstream to the DLC3.
Turn the ignition switch on (IG).

Select the Data List mode on Techstream (See DATA LIST/ACTIVE TEST ).

ABS / VSC / TRAC:

ABS / VSC / TRAC

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Stop Light SW	Stop light switch / ON or OFF	ON Brake pedal depressed OFF Brake pedal released	-

Check that the stop light switch condition observed on Techstream changes according to brake pedal operation.
OK: The Techstream displays ON or OFF according to brake pedal operation.

NG: Go to Step 9

OK: Go to next step

INSPECT SKID CONTROL ECU (STP2 TERMINAL)

Turn the ignition switch off.
Make sure that there is no looseness at the locking part and the connecting part of the connector.
Disconnect the skid control ECU connector.

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

Standard resistance

RESISTANCE SPECIFICATION TABLE

Tester Connection	Condition	Specified Condition
A24-2 (STP) - A24-22 (STP2)	Always	Below 1 Ω

Fig 1: Identifying A24 Skid Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)

OK: Go to next step

PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT CONTROL RELAY)

Reconnect the skid control ECU connector.
Connect Techstream to the DLC3.
Start the engine.

Select the Active Test mode on Techstream (See DATA LIST/ACTIVE TEST ).

ABS / VSC / TRAC:

ABS / VSC / TRAC

Tester Display	Test Part	Control Range	Diagnostic Note
Stop Light Relay	Stop light control relay	Relay ON / OFF	Stop lights come on

Check that the "ON" and "OFF" of the stop lights can be shown on the rear combination light by Techstream.
OK: The stop lights turn on or off in accordance with Techstream.

NG: Go to step 6

OK: Go to next step

RECONFIRM DTC

Turn the ignition switch off.
Clear the DTCs (See DTC CHECK/CLEAR ).
Start the engine.
Perform a road test.

Check if the same DTC is recorded (See DTC CHECK/CLEAR ).

Result

RESULT REFERENCE TABLE

Result	Proceed to
DTC (C1380) is not output	A
DTC (C1380) is output	B

B: REPLACE BRAKE ACTUATOR ASSEMBLY (See REMOVAL )

A: CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (See DIAGNOSIS SYSTEM )

INSPECT STOP LIGHT CONTROL RELAY

Turn the ignition switch off.
Remove the stop light control relay.

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

Standard resistance

RESISTANCE SPECIFICATION TABLE

Tester Connection	Condition	Specified Condition
3 - 4	Voltage is not applied between terminals 1 and 2	Below 1 Ω
3 - 5	Voltage is not applied between terminals 1 and 2	10 kΩ or higher
3 - 4	Voltage is applied between terminals 1 and 2	10 kΩ or higher
3 - 5	Voltage is applied between terminals 1 and 2	Below 1 Ω

Fig 2: Identifying Stop Light Control Relay Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LIGHT CONTROL RELAY

OK: Go to next step

INSPECT ENGINE ROOM RELAY BLOCK (POWER SOURCE TERMINAL)

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

Standard voltage

VOLTAGE SPECIFICATION TABLE

Tester Connection	Condition	Specified Condition
Stop light control relay terminal 5 - Body ground	Always	11 to 14 V
Stop light control relay terminal 2 - Body ground	Ignition switch on (IG)	11 to 14 V

Fig 3: Identifying Stop Light Control Relay Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

OK: Go to next step

INSPECT SKID CONTROL ECU (STPO TERMINAL)

Install the stop light control relay.
Make sure that there is no looseness at the locking part and the connecting part of the connector.
Disconnect the skid control ECU connector.
Turn the ignition switch on (IG).

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

Standard voltage

VOLTAGE SPECIFICATION TABLE

Tester Connection	Switch Condition	Specified Condition
A24-31 (STPO) - Body ground	Ignition switch on (IG)	11 to 14 V

Fig 4: Identifying A24 Skid Control ECU Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STPO CIRCUIT)

OK: REPLACE BRAKE ACTUATOR ASSEMBLY (See REMOVAL )

INSPECT SKID CONTROL ECU (STP TERMINAL)

Turn the ignition switch off.
Make sure that there is no looseness at the locking part and the connecting part of the connector.
Disconnect the skid control ECU connector.

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

Standard voltage

VOLTAGE SPECIFICATION TABLE

Tester Connection	Switch Condition	Specified Condition
A24-2 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
A24-2 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

Fig 5: Identifying A24 Skid Control ECU Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

OK: REPLACE BRAKE ACTUATOR ASSEMBLY (See REMOVAL )