Home Vehicle Interior Seat SEAT HEATER SYSTEM
Last Modified: 11-27-2007 1.6 G
Service Category: Vehicle Interior Section: Seat
Model Year: 2008 Model: LX570 Doc ID: RM0000030EY008X
Title: SEAT: SEAT HEATER SYSTEM: ON-VEHICLE INSPECTION (2008 LX570)

ON-VEHICLE INSPECTION

1. INSPECT SEAT HEATER CONTROL SUB-ASSEMBLY (for Front Side)



(a) Disconnect the c13 and c1 heater control connectors.

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

Standard Resistance:

for LH

Tester Connection

Condition

Specified Condition

c13-6 (E) - Body ground

Always

Below 1 Ω

for RH

Tester Connection

Condition

Specified Condition

c1-6 (E) - Body ground

Always

Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

for LH

Tester Connection

Switch Condition

Specified Condition

c13-1 (SWL) - c13-6 (E)

Engine switch on (IG), seat heater switch off

Below 1 V

Engine switch on (IG), seat heater switch on

11 to 14 V

c13-4 (B) - c13-6 (E)

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

for RH

Tester Connection

Switch Condition

Specified Condition

c1-1 (SWR) - c1-6 (E)

Engine switch on (IG), seat heater switch off

Below 1 V

Engine switch on (IG), seat heater switch on

11 to 14 V

c1-4 (B1) - c1-6 (E)

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

If the result is not as specified, there may be a malfunction on the wire harness side.

(d) Connect the c13 and c1 heater control connectors.


(e) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

for LH

Tester Connection

Switch Condition

Specified Condition

c13-5 (THL) - Body ground

Engine switch on (IG), seat heater switch on, volume Min → Max

Gradual increase from below 1 V to 11 to 14 V

for RH

Tester Connection

Switch Condition

Specified Condition

c1-5 (THR) - Body ground

Engine switch on (IG), seat heater switch on, volume Min → Max

Gradual increase from below 1 V to 11 to 14 V

If the result is not as specified, the seat heater control may have a malfunction.