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Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Toyota RAV4, 2002 Toyota RAV4, 2002 Toyota Highlander, 2001 Toyota RAV4, and 2001 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. Access ECM. See Figure or Figure . Turn ignition switch to the ON position. Using a DVOM, measure voltage by backprobing between appropriate ECM harness connector, terminal No. 15 (STP) and ground. With brake pedal applied, voltage should be 7.5-14 volts. With brake pedal released, voltage should be less than 1.5 volts. If voltage is not as specified, go to next step. If voltage is as specified, problem is intermittent. Check wiring harness and connector.
  2. Check brakelight switch. See BRAKELIGHT SWITCH  under COMPONENT TESTS. Replace brakelight switch as necessary. If brakelight switch is okay, check circuit between brakelight switch and ECM. If circuit is okay, replace ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE.
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