Engine Switch: Inspection

WARNING: This page is about a different car, the 2007 Lexus GS 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT ENGINE SWITCH

Measure the resistance of the switch.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Switch Condition	Specified Condition
7 (SS1) - 5 (GND)	Not pushed	10 kΩ or higher
2 (SS2) - 5 (GND)	Not pushed	10 kΩ or higher
7 (SS1) - 5 (GND)	Pushed	Below 1 Ω
2 (SS2) - 5 (GND)	Pushed	Below 1 Ω

Fig 1: Identifying Engine Switch Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Apply battery voltage between the terminals of the switch, and check the illumination condition of the switch.

HINT:

If the positive (+) lead and the negative (-) lead are incorrectly connected, the engine switch indicator will not illuminate.
If the voltage is too low, the indicator will not illuminate.

MEASUREMENT CONDITION SPECIFIED CONDITION CHART

Measurement Condition	Specified Condition
Battery positive (+) → Terminal 11 (SWIL) Battery negative (-) → Terminal 4 (COM) or 5 (GND)	Illuminates
Battery positive (+) → Terminal 12 (INDS) Battery negative (-) → Terminal 4 (COM) or 5 (GND)	Illuminates
Battery positive (+) → Terminal 13 (INDW) Battery negative (-) → Terminal 4 (COM) or 5 (GND)	Illuminates

Fig 2: Identifying Engine Start Switch With Connector Terminal

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