Front Power Seat Lumbar Switch: Inspection

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT LUMBAR FRONT POWER SEAT SWITCH LH

Measure the resistance between the terminals of the seat switch.

Fig 1: Identifying Lumbar Front Power Seat Switch Connectors Terminal LH

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Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
1 (LF) - 4 (B2) 2 (LR) - 3 (E2)	FRONT	Below 1 Ω
1 (LF) - 3 (E2) 2 (LR) - 3 (E2)	OFF	Below 1 Ω
1 (LF) - 3 (E2) 2 (LR) - 4 (B2)	BACK	Below 1 Ω

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

INSPECT LUMBAR FRONT POWER SEAT SWITCH RH

Measure the resistance between the terminals of the seat switch.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
1 (B) - 4 (LF) 2 (E) - 3 (LR)	FRONT	Below 1 Ω
2 (E) - 3 (LR) 2 (E) - 4 (LF)	OFF	Below 1 Ω
1 (B) - 3 (LR) 2 (E) - 4 (LF)	BACK	Below 1 Ω

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

Fig 2: Identifying Lumbar Front Power Seat Switch Connectors Terminal RH