Lexus IS250 IS220d GSE20 ALE20 - SEAT
SEAT HEATER SWITCH - INSPECTION
1. INSPECT SEAT HEATER SWITCH |

Inspect seat heater switch operation.
Measure the resistance according to the value(s) in the table below.
- Resistance:
Tester Connection Switch Position Specified Condition 1 (RV) - 6 (SW) OFF: Front RH
Vol: 0Below 2.5 kΩ OFF: Front RH
Vol: 3Below 376 Ω 2 (REL1) - 11 (SW) OFF: Front LH
Vol: 0Below 2.5 kΩ OFF: Front LH
Vol: 3Below 376 Ω 7 (BLLH) - 10 (SVSG) OFF: Front RH
Vol: 0Below 1.1 kΩ OFF: Front RH
Vol: 3Below 111 Ω 8 (SVS5) - 10 (SVSG) Always Below 770 - 1.43 kΩ 9 (BLRH) - 10 (SVSG) OFF: Front LH
Vol: 0Below 1.1 kΩ OFF: Front LH
Vol: 3Below 111 Ω
Inspect seat heater switch indicator operation.
Apply battery voltage and check operation of the switch, as shown in the table below.
- Standard:
Measurement Condition Condition Specified Condition Battery positive (+) → Terminal 5 (IG)
Battery negative (-) → Terminal 12 (E)Seat heater switch ON Indicator comes on
Inspect seat heater switch illumination.
Apply battery voltage and check operation of the switch, as shown in the table below.
- Standard:
Measurement Condition Specified Condition Battery positive (+) → Terminal 4 (ILL+)
Battery negative (-) → Terminal 3 (ILL-)Illumination comes on