Inspection Procedure

NOTE: When replacing the master cylinder solenoid, perform zero point calibration (See CALIBRATION ).

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.
NG: Go to step 4

OK: Go to Next Step

INSPECT SKID CONTROL ECU (STP TERMINAL)

Fig 1: Identifying Skid Control ECU Connector S37

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the skid control ECU connector.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection	Condition	Specified Condition
S37-7 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
S37-7 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

Result

RESULT TABLE

Condition	Proceed to
OK (When troubleshooting in accordance with DIAGNOSTIC TROUBLE CODE TABLE )	A
OK (When troubleshooting in accordance with PROBLEM SYMPTOMS TABLE )	B
NG	C

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

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

A: Go to Next Step

RECONFIRM DTC

Clear the DTC (See DTC CHECK/CLEAR ).
Check if the same DTC is detected (See DTC CHECK/CLEAR ).
HINT:

Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result

RESULT TABLE

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

B: END

A: REPLACE MASTER CYLINDER SOLENOID

INSPECT STOP LIGHT SWITCH ASSEMBLY (POWER SOURCE TERMINAL)

Fig 2: Identifying Stop Light Switch Connector S17

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the stop light switch connector.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection	Condition	Specified Condition
S17-2 - 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

Fig 3: Identifying Stop Light Switch Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection	Condition	Specified Condition
S17-1 - S17-2	Switch pin free	Below 1 Ω
S17-1 - S17-2	Switch pin pushed in	10 kΩ or higher

NG: REPLACE STOP LIGHT SWITCH ASSEMBLY

OK: Go to Next Step

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

Fig 4: Identifying Skid Control ECU Connector S37

Disconnect the skid control ECU connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection	Specified Condition
S37-7 (STP) - S17-1	Below 1 Ω
S37-7 (STP) - Body ground	10 kΩ or higher

HINT:

When troubleshooting in accordance with the DTC TABLE, check DTCs before replacing the master cylinder solenoid (See DTC CHECK/CLEAR ).
When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE, be sure to follow the table before replacing the master cylinder solenoid (See PROBLEM SYMPTOMS TABLE ).

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

OK: REPLACE MASTER CYLINDER SOLENOID