Section 410 (Turn Signal & Hazard Warning System): Inspection

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT TURN SIGNAL SWITCH CONTINUITY

SPECIFIED CONDITION

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: Identifying Right & Left Turn

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.

Fig 2: Inspecting Turn Signal Switch Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

SPECIFIED CONDITION

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.

Fig 3: Inspecting Connector Form Back Side

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

SPECIFIED CONDITION

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.

INSPECT HAZARD WARNING SWITCH CONTINUITY

SPECIFIED CONDITION

Switch position	Tester connection	Specified condition
Hazard button FREE	3-5	No continuity
Hazard button Pushed in	3-5	Continuity

If continuity is not as specified, replace the switch.

Fig 4: Identifying Connector

INSPECT TURN SIGNAL FLASHER CIRCUIT

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

Fig 5: Inspecting Connector Wire Harness Side

SPECIFIED CONDITION

Tester connection	Condition	Specified condition
2 - Ground	Always	Continuity
3 - Ground	Always	Continuity
5 - Ground	Turn signal switch RIGHT or OFF	No continuity
5 - Ground	Turn signal switch LEFT	Continuity
6 - Ground	Turn signal switch LEFT or OFF	No continuity
6 - Ground	Turn signal switch RIGHT	Continuity
7 - Ground	Always	Continuity
8 - Ground	Hazard warning switch OFF	No continuity
8 - Ground	Hazard warning switch ON	Continuity
1 - Ground	Ignition switch LOCK or ACC	No voltage
1 - Ground	Ignition switch ON	Battery positive voltage
4 - Ground	Always	Battery positive voltage

If circuit is as specified, replace the relay.

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