Section 331 (Stop Light System): Inspection

WARNING: This page is about a different car, the 2003 Lexus GS 430 and 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT STOP LIGHT SWITCH CONTINUITY

STOP LIGHT SWITCH CONTINUITY

Switch position	Tester connection	Specified condition.
Switch pin free (Pedal depressed)	-	No continuity
Switch pin pushed in (Pedal released)	1 - 2	Continuity
Switch pin free (Pedal depressed)	-	No continuity
Switch pin pushed in (Pedal released)	3 - 4	Continuity

If continuity is not as specified, replace the switch.

Fig 1: Inspecting Stop Light Switch Continuity

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT STOP LIGHT SWITCH CIRCUIT

(See STOP LIGHT SWITCH CIRCUIT )

Disconnect the connector from the switch and inspect the connector on the wire harness side, as shown.

Fig 2: Identifying Terminals Of Stop Light Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

STOP LIGHT SWITCH CONNECTOR SPECIFIED CONDITION

Tester connection	Condition	Specified condition
2 - Ground	Constant	Battery positive voltage

If circuit is not as specified, inspect the power source or wire harness.

INSPECT HI-MOUNTED STOP LIGHT CONTINUITY
Using an ohmmeter, check that continuity exists between terminals.

If continuity is not as specified, replace the light assembly or bulb.

Fig 3: Identifying Terminals Of Hi-Mounted Stop Light Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT HI-MOUNTED STOP LIGHT CIRCUIT

Disconnect the connector from the light and inspect the connector on the wire harness side, as shown in Fig 4.

Fig 4: Identifying Terminals Of Hi-Mounted Stop Light Connector

HI-MOUNTED STOP LIGHT CONNECTOR SPECIFIED CONDITION

Tester connection	Condition	Specified condition
2 - Ground	Constant	Continuity

If circuit is not as specified, inspect the power source or wire harness.

INSPECT LIGHT FAILURE SENSOR
(See LAMP FAILURE SENSOR CIRCUIT and INSPECTION )