Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE OF TECHSTREAM (STOP LIGHT SWITCH)

Using the Techstream, read the Data List.

Techstream

DATA LIST - CRUISE CONTROL

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

OK: Normal conditions listed above are displayed.

Result

RESULT REFERENCE

Result	Proceed to
NG	A
OK (for 1GR-FE)	B
OK (for 2UZ-FE)	C
OK (for 3UR-FE)	D

B: REPLACE ECM (See REMOVAL (1GR-FE))

C: REPLACE ECM (See REMOVAL (2UZ-FE))

D: REPLACE ECM (See REMOVAL (3UR-FE))

A: Go to Next Step

INSPECT STOP LIGHT SWITCH

Remove the stop light switch (see REMOVAL ).

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

Standard resistance

STOP LIGHT SWITCH

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

Fig 1: Inspecting Stop Light Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LIGHT SWITCH (See REMOVAL )

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (BATTERY - STOP LIGHT SWITCH)

Disconnect the A4 stop light switch connector.

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

Standard voltage

BATTERY - STOP LIGHT SWITCH

Tester Connection	Switch Condition	Specified Condition
A4-2 - Body ground	Always	11 to 14 V
A4-3 - Body ground	Ignition switch ON	11 to 14 V

Fig 2: Identifying A4 Stop Light Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM)

Disconnect the A4 stop light switch connector.
Disconnect the A24 ECM connector.