Window Defogger System: Inspection

WARNING: This page is about a different car, the 2009 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

CHECK STEERING PAD SWITCH

Remove the horn button (See REMOVAL ).
Disconnect the connector as shown in Fig 1.

Fig 1: Disconnecting Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Identifying Steering Pad Switch Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the switch.

Standard resistance

TERMINALS RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
3 (AC1) - 7 (EAC)	OFF	29 to 31 kΩ
3 (AC1) - 7 (EAC)	ON	290 to 305 Ω

If the result is not as specified, replace the switch.