Toyota Tundra. Manual — part 936

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go To Next Step

3. INSPECT BRAKE BOOSTER ASSEMBLY (PEDAL STROKE SENSOR)

a. Disconnect the A19 sensor connector.

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

Fig. 63: Identifying A19 Sensor Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

OK: REPLACE BRAKE BOOSTER ASSEMBLY (See REMOVAL )

DTC C1249/49: OPEN IN STOP LIGHT SWITCH CIRCUIT

DESCRIPTION

The skid control ECU detects the brake operating conditions through a signal transmitted by the stop light
switch. The skid control ECU incorporates an open circuit detection circuit.

DTC DETECTION CONDITION TABLE

Tester Connection

Switch Condition

Specified Condition

A19-1 (VCP) - Body ground

Ignition switch ON

5.0 V

DTC Code

DTC Detection Condition

Trouble Area

When one of following conditions

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

WIRING DIAGRAM

C1249/49

is met:

1. When voltage of STP2 pin is

detected to be outside range
of 1.4 to 2.2 V for 1 second.

2. When stop light switch

signal and stop light control
relay drive signal do not
match for 1.2 seconds.

3. When pressure sensor signal

indicates pressure increase,
but stop light switch signal
does not change.

4. While driving at speed of 20

km/h (12 mph) or more, stop
light switch is ON for more
than 6 minutes.

5. While vehicle is accelerated

to higher than 40 km/h (24.9
mph) and then decelerated to
less than 3 km/h (1.9 mph),
stop light switch signal
change from OFF to ON is
not detected (4 trip detection
logic).



ECU-IG1 fuse



STOP fuse



Stop light control relay



Stop light switch



Stop light switch circuit



VSC actuator assembly

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Fig. 64: Identifying Stop Light Switch Circuit - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Select the Data List mode on the Techstream.

ABS/VSC/TRAC

DIAGNOSTIC NOTE TABLE

NOTE:

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

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

-

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

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

NG: Go to step 3

OK: Go To Next Step

2. RECONFIRM DTC

a. Clear the DTC (See DTC CHECK/CLEAR ).

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

Result

RESULT TABLE

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

A: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

3. INSPECT FUSE (STOP)

a. Remove the STOP fuse from the engine room relay block.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

released

Result

Proceed to

DTC is output

A

DTC is not output

B

Tester Connection

Condition

Specified Condition

STOP fuse

Always

Below 1 ohms

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra