Inspection Procedure

NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (see INITIALIZATION ).

INSPECT FUSE (STOP)

Remove the STOP fuse from the main body ECU.

Measure the resistance of the fuse.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Switch Condition	Specified Condition
STOP fuse	Always	Below 1 Ω

NG: REPLACE FUSE

OK: Go to Next Step

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

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

Select the Data List mode on the Techstream.

ABS/VSC/TRAC

TESTER DISPLAY REFERENCE CHART

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 observed on the Techstream changes when the brake pedal is depressed.
OK: When the brake pedal is depressed, the Techstream displays "ON".

OK: GO TO LIGHTING SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING )

NG: Go to Next Step

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - BATTERY)

Disconnect the A35 switch connector.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Switch Condition	Specified Condition
A35-2 - Body ground	Always	11 to 14 V

Fig 1: Identifying A35 Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

INSPECT STOP LIGHT SWITCH

Disconnect the stop light switch connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

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

Fig 2: Inspecting Stop Light Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LIGHT SWITCH

OK: Go to Next Step

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

Disconnect the A21 ECU connector.
Disconnect the A35 switch connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Condition	Specified Condition
A21-25 (STP) - A35-1	Always	Below 1 Ω
A21-25 (STP) - Body ground	Always	2 kΩ or lower

Fig 3: Identifying A21 ECU And A35 Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BODY GROUND)

Disconnect the A19 and A21 ECU connectors.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Condition	Specified Condition
A19-1 (GND) -Body ground	Always	Below 1 Ω
A21-1 (GND4) - Body ground	Always	Below 1 Ω

Fig 4: Identifying A19 And A21 ECU Connector Terminals (GND)

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

RECONFIRM DTC

Clear the DTC (see DTC CHECK/CLEAR ).
Start the engine.
Depress the brake pedal several times to test the stop light circuit.

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

HINT:

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

Result

RESULT CHART

Result	Proceed to
DTC (C1249/49) is not output	A
DTC (C1249/49) is output	B

HINT:

If troubleshooting has been carried out according to the "PROBLEM SYMPTOMS TABLE", refer back to the table and proceed to the next step (see PROBLEM SYMPTOMS TABLE ).

B: REPLACE SKID CONTROL ECU (See REMOVAL )

A: END