Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT STOP LAMP SWITCH OPERATION
1. Check that the stop lamp lights up when brake pedal is depressed and turns OFF when the brake pedal is released.
1. NG: INSPECT STOP LAMP SWITCH CIRCUIT (See DTC C1249/49: OPEN CIRCUIT IN STOP LIGHT SWITCH CIRCUIT )
2. OK: Go to Next Step

INSPECT STOP LAMP SWITCH ASSY

Disconnect the stop lamp switch assy connector.
Measure the continuity between each terminal of the stop lamp switch assy.

Standard:

TESTER CONNECTION

Switch condition	Tester connection	Specification
Switch pin free	1 - 2	Continuity
Switch pin free	3 - 4	No continuity
Switch pin pushed in	1 - 2	No continuity
Switch pin pushed in	3 - 4	Continuity

Fig 1: Inspecting Stop Lamp Switch Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LAMP SWITCH ASSY
OK: Go to Next Step

INSPECT ECM

Remove the ECM with connectors.
Turn the ignition switch ON.

Measure voltage between terminal STP of ECM connector and body ground when the brake pedal is depressed and released.

Standard:

PEDAL VOLTAGE

Pedal condition	Voltage (V)
Depressed	10 to 14
Released	Below 1

Fig 2: Inspecting ECM

Measure voltage between terminal ST1 - of ECM connector and body ground when the brake pedal is depressed and released.

Standard:

PEDAL VOLTAGE

Pedal condition	Voltage (V)
Depressed	Below 1
Released	10 to 14

Fig 3: Measuring Voltage Between Terminal ST1 & Of ECM Connector

NG: REPLACE ECM (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE )
OK: REPAIR OR REPLACE HARNESS OR CONNECTOR