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.
  
  HINT:
  
  Check the stop light bulb as it may have burnt out.
  
  NG: Go to step 4
  
  OK: Go to next step

INSPECT SKID CONTROL ECU (STP TERMINAL)

Disconnect the skid control ECU connector.

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

Standard voltage

VOLTAGE REFERENCE

Tester Connection	Condition	Specified Condition
S28-7 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
S28-7 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

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

Fig 1: Identifying S28 Skid Control ECU Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

RECONFIRM DTC (See INSPECTION PROCEDURE )
B: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS )

A: REPLACE MASTER CYLINDER SOLENOID

INSPECT STOP LIGHT SWITCH ASSEMBLY (POWER SOURCE TERMINAL)

Disconnect the stop light switch connector.

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

Standard voltage

w/o Rear Spoiler

VOLTAGE REFERENCE

Tester Connection	Condition	Specified Condition
S12-2 - Body ground	Always	10 to 14 V

w/ Rear Spoiler

VOLTAGE REFERENCE

Tester Connection	Condition	Specified Condition
S37-2 - Body ground	Always	10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Fig 2: Identifying S12 Stop Light Switch Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

INSPECT STOP LIGHT SWITCH ASSEMBLY

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

Standard resistance

TESTER CONNECTION CONDITION CHART

Tester Connection	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 ASSEMBLY

Fig 3: Inspecting Stop Light Switch Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

INSPECT STOP LIGHT OPERATION RELAY

Remove the stop light operation relay.

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

Standard resistance

TESTER CONNECTION CONDITION CHART

Tester Connection	Condition	Specified Condition
3 - 4	Always	Below 1 Ω

NG: REPLACE STOP LIGHT OPERATION RELAY

Fig 4: Identifying Stop Light Operation Relay

OK: Go to next step

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

Disconnect the skid control ECU connector.

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

Standard resistance w/o Rear Spoiler

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
S28-7 (STP) - S12-1	Always	Below 1 Ω
S28-7 (STP) - Body ground	Always	10 kΩ or higher

w/ Rear Spoiler

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
S28-7 (STP) - S37-1	Always	Below 1 Ω
S28-7 (STP) - Body ground	Always	10 kΩ or higher

HINT:

When troubleshooting in accordance with the DTC CHART, check for 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

Fig 5: Identifying Skid Control ECU Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE MASTER CYLINDER SOLENOID