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Diagnostic Procedure

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. Turn ignition off. Remove and inspect STOP (15-amp) fuse in driver side junction block. See Figure. If fuse is okay, reinstall fuse and go to next step. If fuse is blown, check wiring between stoplight switch and fuse for short to ground. See CRUISE CONTROL in SYSTEM WIRING DIAGRAMS article. Replace fuse. After repairs, perform confirmation test. See CONFIRMATION TEST .
  2. Check stoplight switch. See STOPLIGHT SWITCH  under COMPONENT TESTS. If stoplight switch is okay, go to next step. If stoplight switch is defective, replace stoplight switch. See STOPLIGHT SWITCH  under REMOVAL & INSTALLATION. After repairs, perform confirmation test. See CONFIRMATION TEST .
  3. Turn ignition off. Disconnect cruise control actuator Black 4-pin electrical harness connector. Using a DVOM, measure resistance between cruise control actuator terminals No. 3 and 4. See Figure. If resistance is 34.65-42.35 ohms, go to next step. If resistance is not 34.65-42.35 ohms, replace cruise control actuator. See CRUISE CONTROL ACTUATOR  under REMOVAL & INSTALLATION. After repairs, perform confirmation test. See CONFIRMATION TEST .
  4. Turn ignition off. Disconnect cruise control actuator Black 4-pin electrical harness connector. Using a DVOM, check for open and short circuit conditions in ground circuit (White/Black wire) between cruise control actuator Black 4-pin electrical harness connector terminal No. 4 and good body ground point. See Figure. If wires, harnesses and connectors are okay, go to next step. If wires, harnesses and connectors are not okay, repair fault as required. See CRUISE CONTROL in SYSTEM WIRING DIAGRAMS article. After repairs, perform confirmation test. See CONFIRMATION TEST .
  5. Turn ignition off. With cruise control actuator Black 4-pin electrical harness connector disconnected, disconnect cruise control ECU 16-pin electrical harness connector. Using a DVOM, check for open and short circuit conditions in Pink wire between cruise control ECU 16-pin electrical harness connector terminal No. 15 and cruise control actuator Black 4-pin electrical harness connector terminal No. 1. See Figure. Also, check Red wire between cruise control ECU 16-pin electrical harness connector terminal No. 7 and cruise control actuator Black 4-pin electrical harness connector terminal No. 2. Repair identified fault as required. See CRUISE CONTROL in SYSTEM WIRING DIAGRAMS article. After repairs, perform confirmation test. See CONFIRMATION TEST . If wires, harnesses and connectors are okay, go to next step.
  6. Turn ignition off. Reconnect cruise control actuator Black 4-pin electrical harness connector. Leave cruise control ECU 16-pin electrical harness connector disconnected. Using DVOM, check cruise control ECU ground circuit. See CRUISE CONTROL in SYSTEM WIRING DIAGRAMS article. If ground circuit is faulty, repair and retest system. If ground circuit is okay, substitute original cruise control ECU with a known-good unit and recheck system operation. If system operates properly, original cruise control ECU was defective. If system still does not operate properly, perform cruise control 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. See CRUISE CONTROL in SYSTEM WIRING DIAGRAMS article. If voltage values, harnesses and connectors are okay, replace cruise control ECU. See CRUISE CONTROL ELECTRONIC CONTROL UNIT  under REMOVAL & INSTALLATION. After repairs, perform confirmation test. See CONFIRMATION TEST .
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