Section 160 (Stop Light System): Inspection

WARNING: This page is about a different car, the 2003 Lexus RX 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 CONDITIONS

Switch position	Tester connection	Specified condition
Switch pin free	1 - 2	Continuity
Switch pin pushed in	3 - 4	Continuity

If continuity is not as specified, replace the switch.

Fig 1: Identifying Stop Light Switch Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT STOP LIGHT SWITCH CIRCUIT

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

Fig 2: Identifying Stop Light Switch Connector Terminals (Wire Harness Side)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

STOP LIGHT SWITCH WIRE HARNESS SIDE CONNECTOR INSPECTING CONDITIONS

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 HIGH-MOUNTED STOP LIGHT ASSEMBLY CONTINUITY
Using the ohmmeter, check that continuity exists between terminals.

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

Fig 3: Identifying High-Mounted Stop Light Assembly Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT HIGH-MOUNTED STOP LIGHT ASSEMBLY CIRCUIT

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

HIGH-MOUNTED STOP LIGHT WIRE HARNESS SIDE CONNECTOR INSPECTING CONDITIONS

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

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

Fig 4: Identifying High-Mounted Stop Light Assembly Connector Terminals (Wire Harness Side)

INSPECT LIGHT FAILURE SENSOR CIRCUIT

Disconnect the connector from the sensor and inspect the connector on the wire harness side.

Fig 5: Identifying Light Failure Sensor Connector Terminals (Wire Harness Side)

LIGHT FAILURE SENSOR WIRE HARNESS SIDE CONNECTOR VOLTAGE AND CONTINUITY CONDITIONS

Tester connection	Condition	Specified condition
1 - Ground	Constant	Continuity*
2 - Ground	Constant	Continuity*
9 - Ground	Constant	Continuity*
11 - Ground	Constant	Continuity
3 - Ground	Light control switch OFF	No voltage
3 - Ground	Light control switch TAIL or HEAD	Battery positive voltage
4 - Ground	Ignition switch LOCK or ACC	No voltage
4 - Ground	Ignition switch ON	Battery positive voltage
7 - Ground	Stop light switch OFF	No voltage
7 - Ground	Stop light switch ON	Battery positive voltage
8 - Ground	Ignition switch LOCK or ACC	No voltage
8 - Ground	Ignition switch ON	Battery positive voltage
* There is resistance because this circuit is grounded through the bulb.

If the circuit is as specified, replace the sensor.

If the circuit is not as specified, inspect the circuits connected to other parts.