Seat Heater Switch: Inspection

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT SEAT HEATER SWITCH

Inspect seat heater switch operation.

Measure the resistance according to the value(s) in the table below

Standard Resistance

STANDARD RESISTANCE

Tester Connection	Switch Condition	Specified Condition
1 (RV) - 6 (SW)	OFF: Front RH Vol: 0	Below 2.5 kΩ
1 (RV) - 6 (SW)	OFF. Front RH Vol: 3	Below 376 Ω
2 (REL1) - 11 (SW)	OFF: Front LH Vol: 0	Below 2.5 kΩ
2 (REL1) - 11 (SW)	OFF. Front LH Vol: 3	Below 376 Ω
7 (BLLH) - 10 (SVSG)	OFF. Front RH Vol: 0	Below 1.1 kΩ
7 (BLLH) - 10 (SVSG)	OFF: Front RH Vol. 3	Below 111 Ω
8 (SVS5) - 10 (SVSG)	Always	Below 770 to 1.43 kΩ
9 (BLRH) - 10 (SVSG)	OFF: Front LH Vol. 0	Below 1.1 kΩ
9 (BLRH) - 10 (SVSG)	OFF: Front LH Vol-3	Below 111 Ω

Fig 1: Identifying Seat Heater Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Inspect seat heater switch indicator operation.

Apply battery voltage and check operation of the switch, as shown in the table below.

Standard

STANDARD REFERENCE

Measurement Condition	Switch Condition	Specified Condition
Battery positive (+) → Terminal 5 (IG) Battery negative (-) → Terminal 12 (E)	Seat heater switch ON	Indicator conies on

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

Inspect seat heater switch illumination.

Apply battery voltage and check operation of the switch, as shown in the table below

Standard

STANDARD REFERENCE

Measurement Condition	Specified Condition
Battery positive (+) → Terminal 4 (ILL+) Battery negative (-) → Terminal 3 (ILL-)	Illumination comes on

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