Test No. 5: When System Is Set, Alarm Does Not Sound When Hood Is Opened
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. Open hood and remove hood latch assembly to access hood courtesy switch. Disconnect hood courtesy switch 2-pin electrical harness connector. Using DVOM, check continuity across hood courtesy switch terminals. When hood latch assembly is in UNLOCK position, continuity should exist. When hood latch assembly is in LOCK position, continuity should not exist. If continuity is as specified, go to next step. If continuity is not as specified, replace hood courtesy switch. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .
- Disconnect theft deterrent ECU 26-pin electrical harness connector T4 and hood courtesy switch 2-pin electrical harness connector. Check Black wire between theft deterrent ECU 26-pin electrical harness connector T4 terminal No. 6 and hood courtesy switch 2-pin electrical harness connector terminal No. 1. See Figure. Also check ground circuit (White/Black wire) between hood courtesy switch 2-pin electrical harness connector terminal No. 2 and body ground point located at left side of engine compartment on inner fender panel to right of engine compartment junction block. See ANTI-THEFT in SYSTEM WIRING DIAGRAMS article. If wiring harnesses and electrical connectors are okay, go to next step. If wiring harnesses or electrical connectors are defective, repair as necessary. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .
- Check theft deterrent ECU ground circuits. See ANTI-THEFT in SYSTEM WIRING DIAGRAMS article. If ground circuits are faulty, repair and retest system. If ground circuits are okay, substitute original theft deterrent ECU with a known-good unit and recheck system operation. If system operates properly, original theft deterrent ECU was defective. If system still does not operate properly, perform theft deterrent ECU pin voltage/resistance checks. See Figure. If voltage/resistance values are okay, replace theft deterrent ECU. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .