Inspection Procedure

NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration (See CALIBRATION ).

HINT:

After steps 1, 2 and 3 are completed, start the inspection from step 4 when using Techstream and start from step 5 when not using Techstream.

CHECK STOP LIGHT SWITCH OPERATION
1. Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released.
OK:

Stop light switch function is normal.

HINT:

Check the stop light bulb as it may have burnt out.

NG: Go to step 9

OK: Go to next step

INSPECT SKID CONTROL ECU (STP1 TERMINAL VOLTAGE)

Disconnect the skid control ECU connector.
Measure the voltage according to the value (s) in the table below.

Voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
A34-27 (STP1) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
A34-27 (STP1) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

Fig 1: Identifying Terminal STP1 Of A34 Skid Control ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result

RESULT REFERENCE

Result	Proceed to
OK (w/ Dynamic radar cruise control)	A
OK (w/o Dynamic radar cruise control)	B
NG	C

B: Go to step 8

C: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT)

A: Go to next step

CHECK HARNESS AND CONNECTOR (STP1 TO STP2 CIRCUIT)

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

Resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
A34-27 (STP1) - A34-21 (STP2)	Below 1 Ω
A34-27 (STP1) - Body ground	10 kΩ or higher

Fig 2: Identifying Terminal STP2 And STP1 Of A34 Skid Control ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 TO STP2 CIRCUIT)

OK: Go to next step

PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT RELAY)

Reconnect the skid control ECU connector.
Connect Techstream to the DLC3.
Turn the ignition switch on (IG) and turn Techstream main switch on.

Select "ACTIVE TEST" on Techstream.

ACTIVE LIST: ABS/VSC/TRAC

ACTIVE TEST REFERENCE

Item	Vehicle Condition/Test Details	Diagnostic Note
Stop Light Relay	Turns stop light operation relay ON/OFF	Observe rear combination light (Does not come on for 5 sec. or more)

Check that "ON" and "OFF" of the stop light can be shown on the rear combination light by Techstream.

OK:

The stop light turns on or off in accordance with Techstream.

HINT:

Reinstall the sensors, connectors, etc. and restore the vehicle to its prior conditions before rechecking for DTCs.

OK: Go to step 8

NG: Go to next step

INSPECT ENGINE ROOM R/B (BRK RELAY POWER SOURCE TERMINAL VOLTAGE)

Remove the BRK relay.

Fig 3: Identifying BRK Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the ignition switch on (IG).
Measure the voltage according to the value (s) in the table below.

Voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
2 - Body ground	IG switch on (IG)	8 to 14 V
5 - Body ground	IG switch on (IG)	8 to 14 V

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

OK: Go to next step

INSPECT BRK RELAY

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

Resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
3-4	Below 1 Ω
3-5	10 kΩ or higher
3-4	10 kΩ or higher (When battery positive voltage Is applied to terminal 1 and battery negative voltage to terminal 2.)
3-5	Below 1 Ω (When battery positive voltage Is applied to terminal 1 and battery negative voltage to terminal 2.)

Fig 4: Identifying BRK Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE BRK RELAY

OK: Go to next step

INSPECT SKID CONTROL ECU CONNECTOR (STPO TERMINAL VOLTAGE)

Install the stop light operation (DAC) relay.
Disconnect the skid control ECU connector.

Fig 5: Identifying Terminal STPO Of A34 Skid Control ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the ignition switch on (IG).
Measure the voltage according to the value (s) in the table below.

Voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
A34-16 (STPO) - Body ground	IG switch on (IG)	10 to 14 V

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

OK: Go to next step

RECONFIRM DTC

Clear the DTC.
Depress the brake pedal several times to test the stop light circuit.
Check if the same DTC is detected.

HINT:

Reinstall the sensors, connectors, etc. and restore the vehicle to its prior conditions before rechecking for DTCs.

Result

RESULT REFERENCE

Result	Proceed to
DTC Is output	A
DTC Is not output	B

B: END

A: REPLACE ABS & TRACTION ACTUATOR ASSEMBLY

INSPECT STOP LIGHT SWITCH ASSEMBLY (POWER SOURCE TERMINAL VOLTAGE)

Disconnect the stop light switch connector.

Fig 6: Identifying A23 Stop Light Switch Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Measure the voltage according to the value (s) in the table below.

Voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
A23-2 - Body ground	Always	10 to 14 V

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

OK: Go to next step

INSPECT STOP LIGHT SWITCH ASSEMBLY

Disconnect the stop light switch assembly connector.

Fig 7: Inspecting Stop Light Switch Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Measure the resistance according to the value (s) in the table below.

Resistance

RESISTANCE SPECIFICATION

Switch Condition	Tester Connection	Specified Condition
Switch pin free	1-2	Below 1 Ω
Switch pin pushed in	1-2	10 kΩ or higher

Result

RESULT REFERENCE

Result	Proceed to
OK (w/ Dynamic radar cruise control)	A
OK (w/o Dynamic radar cruise control)	B
NG	C

B: Go to step 14

C: REPLACE STOP LIGHT SWITCH ASSEMBLY

A: Go to next step

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH TO BRK RELAY)

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

Resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
A23-1 - BRK relay 4	Below 1 Ω
A23-1 - Body ground	10 kΩ or higher

Fig 8: Identifying A23 Stop Light Switch Connector And BRK Relay

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH TO BRK RELAY)

OK: Go to next step

INSPECT BRK RELAY

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

Resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
3-4	Below 1 Ω

Fig 9: Inspecting BRK Relay

NG: REPLACE BRK RELAY

OK: Go to next step

CHECK HARNESS AND CONNECTOR (BETWEEN REAR COMBINATION LIGHT, BODY GROUND AND BRK RELAY)

Disconnect the rear combination light connector.
Measure the resistance according to the value (s) in the table below.

Resistance

LH:

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
K25-2 - BRK relay 3	Below 1 Ω
K25-1 - Body ground	10 kΩ or higher
K25-3 - Body ground	Below 1 Ω

RH:

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
K29-2 - BRK relay 3	Below 1 Ω
K29-1 - Body ground	10 kΩ or higher
K29-3 - Body ground	Below 1 Ω

Fig 10: Identifying Rear Combination Light Connector And BRK Relay

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT CIRCUIT)

OK: END

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH TO SKID CONTROL ECU)

Disconnect the stop light switch connector and skid control ECU connector.

Fig 11: Identifying A23 Stop Light Switch And A34 Skid Control ECU Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Measure the resistance according to the value (s) in the table below.

Resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
A34-27 (STP1) - A23-1 (STP)	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH TO SKID CONTROL ECU)

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT CIRCUIT)