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Home >> Toyota >> 2003 >> Matrix Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 149 (Power Seats) >> System Tests >> Test No. 12: Return Function Does Not Stop When Brake Pedal Is Depressed
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Test No. 12: Return Function Does Not Stop When Brake Pedal Is Depressed

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 stoplight switch. See STOPLIGHT SWITCH  under COMPONENT TESTS. If stoplight switch is okay, go to next step.
  2. Check wiring harness and connectors between stoplight switch and body control ECU, and between stoplight switch and battery. If wiring harness and connectors are okay, go to next step. If wiring harness and connectors are not okay, repair and/or replace as required. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .
  3. Check power seat ECU ground circuits. If ground circuit resistance is greater than one ohm, repair or replace ground circuit. If ground circuit is okay, substitute original power seat ECU with a known-good unit and recheck manual switch operation of power seat system. If manual switch operation of power seat system operates properly, original power seat ECU was defective. If manual switch operation of power seat system still does not operate properly, perform power seat ECU pin voltage check. See PIN VOLTAGE TESTS . Check wiring harness and electrical connectors for an intermittent problem. Repair wiring harnesses or connectors as necessary. If voltage values, harnesses and connectors are okay, replace power seat ECU. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .
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