Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

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

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.

Select the Data List mode on the Techstream.

ABS/VSC/TRAC

DIAGNOSTIC NOTE TABLE

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	-

OK: ON (brake pedal is depressed) appears on the screen.

NG: Go to step 3

OK: Go To Next Step

RECONFIRM DTC

Clear the DTC (See DTC CHECK/CLEAR ).

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

Result

RESULT TABLE

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

B: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH TROUBLESHOOTING )

A: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

INSPECT FUSE (STOP)

Remove the STOP fuse from the engine room relay block.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection	Condition	Specified Condition
STOP fuse	Always	Below 1 Ω

Fig 1: Identifying STOP Fuse From Engine Room Relay Block

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE

OK: Go To Next Step

INSPECT STOP LIGHT CONTROL RELAY (BRK NO. 1, BRK NO. 2)

Remove the stop light control relays (BRK NO. 1 and BRK NO. 2) from the engine room relay block.

Fig 2: Identifying Stop Light Control Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance: for BRK NO. 1

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection	Switch Condition	Specified Condition
3-4	When battery voltage is not applied to terminals 1 and 2	Below 1 Ω
3-5	When battery voltage is not applied to terminals 1 and 2	10 kΩ or higher
3-4	When battery voltage is applied to terminals 1 and 2	10 kΩ or higher
3-5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

for BRK NO. 2

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection	Switch Condition	Specified Condition
3-4	When battery voltage is not applied to terminals 1 and 2	Below 1 Ω
3-4	When battery voltage is applied to terminals 1 and 2	10 kΩ or higher

NG: REPLACE STOP LIGHT CONTROL RELAY

OK: Go To Next Step

INSPECT STOP LIGHT SWITCH ASSEMBLY

Disconnect the A4 switch connector.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection	Switch Condition	Specified Condition
1-2	Pin not pushed	Below 1 Ω
1-2	Pin pushed	10 kΩ or higher
3-4	Pin not pushed	10 kΩ or higher
3-4	Pin pushed	Below 1 Ω

Fig 3: Identifying Stop Light Switch Assembly

NG: REPLACE STOP LIGHT SWITCH ASSEMBLY (See REMOVAL )

OK: Go To Next Step

CHECK HARNESS AND CONNECTOR (BATTERY - SKID CONTROL ECU)

Disconnect the A17 ECU connector.

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection	Switch Condition	Specified Condition
A17-11 (STP2) - Body ground	Brake pedal depressed	8 to 14 V
A17-11 (STP2) - Body ground	Brake pedal released	Below 4.0 V
A17-41 (STP) - Body ground	Brake pedal depressed	8 to 14 V
A17-41 (STP) - Body ground	Brake pedal released	Below 4.0 V

Fig 4: Identifying A17 Skid Control ECU Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )