Seat Heater - Inspecting Independently Operated Systems

HEATING & AIR CONDITIONING
AC003-99

April 9, 1999

Title:
SEAT HEATER SYSTEM INSPECTION

Models:
'99 RX 300

Introduction

RX 300's now have Seat Heaters that work independently from one another. As a result of this change, a new Seat Heater Inspection Method has been developed. Vehicles produced without independently operated Seat Heaters should still refer to the inspection procedures published in the RX 300 Repair Manual listed below.

PUBLICATION NUMBER PUBLICATION NAME

RM626U2 '99 Lexus RX 300 Repair Manual

Affected Vehicles
^ 1999 RX 300's equipped with Seat Heaters starting with the following VINs:

2WD JT6GF10U*X0019436
4WD JT6HF10U*X0040056

Additional Diagnostic Procedure

SEAT HEATER SWITCH INSPECTION

NOTE: The Inspection Method is the same for both Driver's and Passenger's Seat.

1. inspect Seat Heater Switch Continuity:

SWITCH POSITION TESTER CONNECTION SPECIFIED CONDITION

ON 2-6 Continuity
3-6
OFF 3-6 No Continuity
Illumination Circuit 1-4 Continuity





If continuity is not as specified, replace the switch.

2. inspect Seat Heater Switch Indicator Light Operation:





a. Apply 12V power source to Terminal 3 and ground to Terminal 2.

b. Push the Seat Heater Switch and check that the Indicator Light lights up.

If operation is not as specified, replace the switch.





Warranty information