1998 Toyota Sienna Electrical Problems

Your warning lights on the dashboard stop working when the engine gets hot, except for the check engine light which continues to function. This means you might not see important alerts like low oil pressure, low battery, or overheating until it's too late. The repair will likely involve checking the instrument cluster wiring, connectors, and possibly replacing faulty gauge sending units or the instrument cluster itself.

Your dashboard lights turn on when you press the brake pedal, suggesting an electrical wiring problem where circuits are connected in unusual ways. This abnormal electrical routing raises concerns about whether brake pedal operation could affect engine acceleration. A mechanic should inspect the brake switch and electrical wiring to identify and correct the incorrect connections.

Your car's horn has stopped working completely after first working on and off intermittently. This is a safety concern since you won't be able to alert other drivers to hazards. The repair will likely involve checking the horn relay, fuse, wiring connections, or replacing the horn itself.

TL*THE CONTACT OWNS A 1998 TOYOTA SIENNA. WHILE ATTEMPTING TO START THE VEHICLE, IT SUDDENLY ACCELERATED AND THE ENGINE CONTINUED RUNNING. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALERSHIP WHERE THE CONTACT WAS INFORMED THAT THE FAILURE COULD NOT BE DUPLICATED. THE CURRENT AND FAILURE MILEAGES WERE APPROXIMATELY 100,000. THE CONSUMER STATED WHEN THE VEHICLE WAS FIRST STARTED AFTER SITTING OVERNIGHT, THE ENGINE WOULD REV HIGH EVEN THOUGH THE GEAR WAS IN PARK. THE CONSUMER STATED HE THEN REMOVED THE KEY FROM THE IGNITION. HOWEVER, THE VEHICLE WOULD CONTINUE RUNNING. UPDATED 06/22/10. *JB

PROBLEM WITH THE HORN ON MY 1998 TOYOTA SIENNA. THE HORN STOPPED WORKING ABOUT 3 YEARS AGO. I HAVE HAD THE VEHICLE TO A DEALER AT LEAST 5 TIMES, AND TO A LOCAL REPAIR SHOP AT LEAST 3 TIMES. SPENT OVER $1400 AND THE PROBLEM IS NOT FIXED. THEY HAVE CHANGED THE RELAY, CHANGED CONTACTS, SANDED CONTACTS, AND STILL, THE HORN DOES NOT WORK. FOR THE MOST PART THE HORN WORKS WHEN THE CAR IS STOPPED AND COOL. AFTER DRIVING ON THE HIGHWAY FOR ABOUT 1/2 HOUR TO 1 HOUR, THE HORN STOPS WORKING COMPLETELY. I HAVE BEEN ABLE TO GET IT TO WORK ON THE HIGHWAY BY "JIGGLING" THE STEERING WHEEL AND PUSHING THE HORN AT THE SAME TIME WHILE THE VEHICLE IS MOVING. IN A NUTSHELL, IT IS VERY ERRATIC AND VIRTUALLY ALWAYS STOPS WORKING WHEN WE ARE ON A ROAD TRIP. THIS IS A SERIOUS SAFETY HAZARD BECAUSE THE HORN TYPICALLY DOES NOT WORK AT 55 MPH ON THE HIGHWAY WHEN SOMEONE ON THE HIGHWAY CUTS ME OFF AND IT'S NECESSARY TO USE THE HORN. THE VEHICLE HAS NEVER BEEN IN AN ACCIDENT AND OTHERWISE RUNS FINE DESPITE HAVING 150,000 MILES ON IT. I'VE BEEN VERY DISSATISFIED WITH THE DEALERS AND THEIR OBVIOUS LACK OF EXPERTISE OR PERSISTENCE IN TROUBLESHOOTING THIS UNUSUAL ISSUE. *JB

SINCE JUNE 2003 THE CONSUMER NOTICED THE HORN WOULD NOT OPERATE ALL THE TIME. VEHICLE WAS TAKEN TO THE DEALER ON 8/5/2003. DEALER COULD NOT DETERMINE THE PROBLEM. *AK

CONSUMER IS HAVING PROBLEMS WITH AUTOMOBLE, IN THAT WHEN SHE TURNS IT OFF, IT STARTS, AND WHEN SHE PUTS IT IN PARK, IT STARTS UP. SHE TOOK IT TO A MECHANIC, WHO DISCONNECTED THE ALARM SYSTEM, AND THE AUTOMOBILE STOPPED DOING THE ABOVE. SHE STATED THAT THE MECHANIC FOUND ON THE INTERNET THAT THERE WAS AN INVESTIGATION ON THE ELECTRICAL SYSTEM ON THESE CARS, AND THAT WAS THE EXACT PROBLEM SHE WAS HAVING WITH VEHICLE.*AK

SUMMARY OF VEHICLE (TOYOTA SIENNA), GARAGE, AND HOUSE FIRE ON AUGUST 13, 2001. *AK

WHILE DRIVING THE TIRE PRESSURE LIGHT ILLUMINATES, THIS OCCURS AFTER A TIRE HAS BEEN CHANGED OR ROTATED. NLM

NO SUMMARY,