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

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

NG: REPLACE FUSE

OK: GO TO NEXT STEP

READ VALUE OF INTELLIGENT TESTER OR TECHSTREAM (STOP LIGHT SWITCH)

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

Select the DATA LIST mode on the intelligent tester or Techstream.

Intelligent tester

Skid control ECU:

SKID CONTROL ECU

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

Techstream

Skid control ECU:

SKID CONTROL ECU

Tester Display (for IT2)	Measurement Item/Range	Normal Condition	Diagnostic Note
Stop Lamp SW	Stop light switch / ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

Check that the stop light observed on the intelligent tester or Techstream changes when the brake pedal is depressed.
OK: When the brake pedal is depressed, the intelligent tester or 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)

Fig 1: Identifying A35 Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the A35 switch connector.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP

INSPECT STOP LIGHT SWITCH

Fig 2: Inspecting Stop Light Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the stop light switch connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

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

NG: REPLACE STOP LIGHT SWITCH

OK: GO TO NEXT STEP

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

Fig 3: Identifying A21 ECU Connector And A35 Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP

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

Fig 4: Identifying A19 And A21 ECU Connectors

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

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

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 REFERENCE

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: GO TO NEXT STEP

END