Test No. 13: Cruise Indicator Light Stays On Or Fails To Turn On
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.
- Turn ignition off. Remove cruise control ECU with connector attached. See Figure. Turn ignition on. Using a DVOM, measure voltage by backprobing between cruise control ECU 16-pin electrical harness connector terminals No. 4 (Gray/Red wire) and No. 16 (White/Black wire) while operating cruise control ON/OFF switch. See Figure.
- With cruise control switch in OFF position, voltage should be 10-16 volts. With cruise control switch in ON position, voltage should be below 1.2 volt. If voltage is not as specified, diagnose and repair instrument cluster. See INSTRUMENT PANELS - AVALON article. After repairs, perform confirmation test. See CONFIRMATION TEST . If voltage is as specified, no problem is indicated at this time. Fault may be intermittent, go to next step.
- Turn ignition off. Disconnect cruise control ECU 16-pin electrical harness connector. 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 .