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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 203 (POWER SEATS)SYSTEM TESTSTEST NO. 17: DRIVER & PASSENGER SEAT HEATERS DO NOT OPERATE
2004 Toyota Matrix XR, FWD, Standard

Test No. 17: Driver & Passenger Seat Heaters Do Not Operate

2004 Toyota Matrix XR, FWD, StandardSECTION Test No. 17: Driver & Passenger Seat Heaters Do Not Operate
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check SEAT HTR (20-amp) fuse located in driver side junction block. See Figure. If fuse is okay, go to next step. If fuse is not okay, replace fuse and repair circuit as required. If fuse is okay, check wiring harness and connectors between power seat ECU and battery and repair as necessary. See MEMORY SYSTEMS in SYSTEM WIRING DIAGRAMS article. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .
  2. Remove ignition No. 1 relay from driver side junction block. Check ignition No. 1 relay. See IGNITION NO. 1 RELAY  under COMPONENT TESTS. If ignition No. 1 relay is okay, go to next step.
  3. Check wiring harnesses and connectors between battery and seat heater switches and between seat heater switches and seat heaters. Repair wiring harnesses and connectors as necessary.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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