Section 728 (Turn Signal & Hazard Warning System): Inspection

WARNING: This page is about a different car, the 2004 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT TURN SIGNAL SWITCH CONTINUITY

TURN SIGNAL SWITCH TERMINALS CONTINUITY

Switch position	Tester connection	Specified condition
Left turn	1-2	Continuity
Neutral	-	No continuity
Right turn	2-3	Continuity

If continuity is not as specified, replace the switch.

Fig 1: Inspecting Turn Signal Switch Continuity

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Connector disconnected:

INSPECT TURN SIGNAL SWITCH CIRCUIT

Disconnect the connector from the combination switch and inspect the connector on the wire harness side, as shown in Fig 2 .

Fig 2: Inspecting Turn Signal Switch Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TURN SIGNAL SWITCH TERMINALS CONTINUITY

Tester connection	Condition	Specified condition
2 - Ground	Always	Continuity

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

Connector connected:

INSPECT TURN SIGNAL SWITCH CIRCUIT

Connect the wire harness side connector to the combination switch and inspect the connector form the back side, as shown in Fig 3 .

Fig 3: Inspecting Turn Signal Switch Circuit

TURN SIGNAL SWITCH TERMINALS VOLTAGE

Tester connection	Condition	Specified condition
2 - Ground	Ignition switch ON and turn signal switch Neutral	No voltage
1 - Ground	Ignition switch ON and turn signal switch Left	Battery Positive Voltage <-> 0 V
3 - Ground	Ignition switch ON and turn signal switch Right	Battery Positive Voltage <-> 0 V

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