Section 364 (Turn Signal & Hazard Warning System): Inspection

WARNING: This page is about a different car, the 2004 Lexus GS 430 and 2004 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT TURN SIGNAL SWITCH CONTINUITY

TESTER CONNECTION SPECIFICATION

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.

Fig 2: Inspecting Connector On Wire Harness Side

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TESTER CONNECTION SPECIFICATION

Tester connection	Condition	Specified condition
2 - Ground	Constant	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

TESTER CONNECTION SPECIFICATION

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

TESTER CONNECTION SPECIFICATION

Switch position	Tester connection	Specified condition
Switch OFF	7 - 10	Continuity
Switch ON	7 - 8	Continuity
Illumination circuit	2 - 3	Continuity

If continuity is not as specified, replace the switch.

Fig 4: Inspecting Hazard Warning Switch Continuity

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT HAZARD WARNING SWITCH CIRCUIT (See HAZARD SWITCH CIRCUIT )

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

Fig 5: Inspecting Connection On Wire Harness Side

TESTER CONNECTION SPECIFICATION

Tester connection	Condition	Specified condition
8 - Ground	Constant	Continuity

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

INSPECT TURN SIGNAL FLASHER CIRCUIT

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

Fig 6: Inspecting Connector On Wire Harness Side

TESTER CONNECTION SPECIFICATION

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

If circuit is as specified, replace the relay.

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