Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE ON INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.
Turn the ignition switch on, and turn the intelligent tester main switch on.

Check the DATA LIST for proper functioning of the stop light switch. ECM (Cruise control):

NORMAL CONDITION TABLE

Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
STP LIGHT SW M	Stop light switch signal (Main CPU) / ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

OK:

When the brake pedal is operated, the display changes as shown above.

OK: REPLACE ECM

NG: Go to Next Step

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - BATTERY)

Disconnect the S13 connector from the stop light switch.

Fig 1: Identifying S13 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester Connection	Condition	Specified Condition
S13-2 - Body ground	Always	10 to 14 V
S13-4 - Body ground	Ignition switch on	10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

INSPECT STOP LIGHT SWITCH

Remove the stop light switch.

Fig 2: Identifying Stop Light Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester Connection	Switch Condition	Specified Condition
1 - 2	Switch pin not pushed	10 kΩ or higher
3 - 4	Switch pin not pushed	Below 1 Ω
1 - 2	Switch pin pushed	Below 1 Ω
3 - 4	Switch pin pushed	10 kΩ or higher

Install the stop light switch.

NG: REPLACE STOP LIGHT SWITCH

OK: Go to Next Step

CHECK ECM

Reconnect the stop light switch connector.
Disconnect the E5 connector from the ECM.

Fig 3: Identifying E5 ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the ignition switch on.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester Connection	Brake Pedal Condition	Specified Condition
E5-15 (STP) - Body ground	Depressed	10 to 14 V
E5-15 (STP) - Body ground	Released	Below 1 V
E5-16 (ST1-) - Body ground	Depressed	Below 1 V
E5-16 (ST1-) - Body ground	Released	10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - ECM)

OK: REPLACE ECM