TSB: The Immobilizer and Smart Key Reset is a feature that allows the registration of new keys when all master keys are lost. Once the system is reset, all previously registered keys will be erased. Follow the procedures in this bulletin to reset a vehicle Immobilizer or Smart Key system.
full bulletin at NHTSA ↗2005 Toyota Highlander electrical problems
severe 23 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Failure mileage
Complaints
23
Recalls
0
Avg fix
$850
1crash
3injuries
When does it fail?
Of the 23 electrical complaints filed for the 2005 Toyota Highlander, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
No new NHTSA electrical complaint has been filed on this vehicle in over 15 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering electrical on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
TT: Some customers may encounter Bluetooth® connectivity concerns such as: ?Difficulty to pair the phone. ?Intermittent Bluetooth® failure to connect to the vehicle when first turning on the vehicle. ?Various Bluetooth® Audio functions are no longer functioning with customer?s phone such as ability to change the track using the steering wheel controls. These concerns can be caused by changes made on the customer?s phone. Make sure to inquire with the customer if the connectivity concerns occurred after receiving an operating system update on their phone, or if they have restored their phone data/settings recently.
full bulletin at NHTSA ↗TSB: REVISION NOTICE July 01, 2019 Rev2: ? Applicability has been updated to 2019 ? 2020 model year Toyota vehicles. ? The Techstream Preparation and Process Overview sections have been updated. October 30, 2017 Rev1: ? Applicability has been updated to include 2018 model year vehicles. Any previous printed versions of this bulletin should be discarded. SUPERSESSION NOTICE The information contained in this bulletin supersedes SB No. T-SB-0012-13. Service Bulletin No. T-SB-0012-13 is obsolete and any printed versions should be discarded. Be sure to review the entire content of this bulletin before proceeding. Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated
full bulletin at NHTSA ↗TT: Some customers may encounter Bluetooth® connectivity concerns such as: ? Difficulty to pair the phone. ? Intermittent Bluetooth® failure to connect to the vehicle when first turning on the vehicle. ? Various Bluetooth® Audio functions are no longer functioning with customer?s phone such as ability to change the track using the steering wheel controls. These concerns can be caused by changes made on the customer?s phone. Make sure to inquire with the customer if the connectivity concerns occurred after receiving an operating system update on their phone, or if they have restored their phone data/settings recently.
full bulletin at NHTSA ↗TSB: REVISION NOTICE November 22, 2017 Rev1: ? Applicability has been updated to include 2014 ? 2018 model year vehicles. Any previous printed versions of this bulletin should be discarded. In the event that a Toyota vehicle becomes submerged in water, many components may be physically damaged. Electrical and electronic components, including wiring harnesses, are particularly susceptible to corrosion and subsequent malfunction. Although any flooding can be damaging, salt water flooding elevates the potential for abnormal conditions and may increase risks due to its highly corrosive and conductive nature. Salt residue also continues to corrode and remain conductive even after a vehicle dries.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2005 Highlander electrical system shows patterns of failure across multiple subsystems. Climate control is the standout issue: the heater/AC control unit develops a known problem where the ribbon cable connecting the potentiometer to the control module becomes loose, breaks, or shorts out over time. Owners describe erratic temperature swings—heat to cold and back again, often triggered by bumps in the road—and complete failure of temperature control. Dealers quote $500–$1,500 to replace the entire control unit, but owners report the real fix is a $10 resolder job taking about an hour.
Power windows fail intermittently or completely, especially front passenger and rear windows. One owner reported all windows, moon roof, blinkers, and lights failing simultaneously, pointing to possible relay or ground issues. Door locks don't auto-lock when shifting into gear and can't be opened normally once locked. Dashboard illumination is too dim to read gauges in daylight—multiple owners report needing a flashlight to see the speedometer or fuel gauge in bright sun.
Warning lights present another chronic problem: ABS, brake, tire pressure, traction, and VSC lights stay on together with no clear cause. A hybrid model experienced inverter stall at 55,000 miles. One owner reported a rear wheel locking up on the highway and an alternator failure that killed electrical power and engine control at 45 mph. An air bag failed to deploy in a 70+ mph collision.
Same Toyota Highlander electrical reports on nearby years: 2006 · 2007 · 2008
Failure modes owners describe
Heater/AC Control Unit Intermittent and Complete Failure
Ribbon cable connecting the heater/AC potentiometer control to the climate control unit becomes loose, breaks, or shorts. The control knob can loosen over time, causing the wiring behind it to break free from circuit board contacts. Reports describe erratic temperature swings or complete failure—sometimes requiring replacement of entire control unit by dealers, though owners report the actual fix is resoldering the contacts.
When: Intermittent failures reported at 30,000+ miles; failures accelerate over time with repeated use
Symptoms owners cite: Sudden switch from cool to hot air or vice versa; Temperature control becomes erratic when vehicle hits bumps in the road; Defrost suddenly shifts to AC, causing front window to fog up; Control knob becomes loose; Heater blows only extremely hot air with no temperature control
Repairs/costs cited: Dealers quote $500–$1,500 for full control unit replacement; owners report actual repair is resoldering 3-wire contacts at cost of under $10, taking about 1 hour
Power Windows Intermittent and Complete Failure
Front passenger-side window operates intermittently; rear windows fail to open or close electronically. One owner reported complete failure of windows, moon roof, blinkers, reverse lights, running lights, and brake lights all at once, with suspicion of relay or ground wire failure.
When: Failure mileage not specified in narratives
Symptoms owners cite: Front passenger window fails to function properly intermittently; Rear windows fail to electronically open or close; In one case, all windows plus moon roof stopped working simultaneously
Repairs/costs cited: One owner purchased multifunction blinker/headlight replacement switch and master window replacement switch to troubleshoot; no repair costs stated
Recalls/TSBs owners mention: Manufacturer stated vehicle was excluded from electrical recall for power master window switch failure
Turn Signal Audibility Problem
Turn signal clicker is inaudible at speeds above 35 mph, even for driver without significant hearing loss. Driver must rely on visual indicator lights on dashboard, which are not in primary field of view while driving.
When: Occurs at highway speeds (above 35 mph)
Symptoms owners cite: Turn signal clicker cannot be heard at speeds above 35 mph; Driver inadvertently leaves turn signal on when it should be off; Dashboard turn signal indicator lights work but are not in driver's line of sight
Repairs/costs cited: Owner contacted Toyota about louder flasher unit; Toyota stated they do not have one available
Recalls/TSBs owners mention: Toyota states no louder flasher unit available
Low Tire Pressure Warning Light False Activation
Low tire pressure warning light illuminates on the instrument panel during highway driving even though all four tires are at proper pressure. Dealer diagnostic testing could not determine the cause. Owner suspects computerized system failure.
When: At 21,000 miles; failed on six separate highway driving occasions
Symptoms owners cite: Low tire pressure warning light illuminates at approximately 60 mph on highway; Warning light remains on until vehicle is turned off; All four tire pressures confirmed normal
Repairs/costs cited: Dealer estimated repair cost of $2,414.60 related to computerized system; vehicle not repaired by time of complaint
Power Door Lock Malfunction
Doors do not automatically lock when vehicle is placed into gear. Doors must be manually locked or locked via power lock button. Once locked, doors cannot be opened normally via door handle—require power lock switch or manual unlock.
When: Failure mileage not specified
Symptoms owners cite: Doors do not lock automatically when shifting into gear; Locked doors cannot be opened by pulling door handle; Doors respond only to power lock button or manual manipulation
Recalls/TSBs owners mention: Dealer told owner it was a programming issue and offered to reprogram, but later owner found vehicle has no door lock program feature
Dashboard Illumination Inadequate for Daytime Reading
Instrument panel is impossible to read during daytime or bright conditions due to insufficient backlighting. Odometer, fuel, oil, and speedometer gauges are not visible in sunlight without shining a flashlight on them. Panel is set too far back and lacks strong backlight. Multiple owners report the same issue.
When: Since purchase; affects visibility during daylight driving
Symptoms owners cite: Instrument panel appears black during the day; Cannot read odometer, fuel gauge, oil pressure, or speed; Cannot read mileage on bright days; Backlight is insufficient compared to nighttime visibility
Recalls/TSBs owners mention: Dealership informed owner that the dashboard was not able to be read but this is how the vehicle was manufactured
ABS/Traction Control/VSC Warning Lights Persistent Illumination
ABS, brake, tire pressure, traction control, and VSC (Vehicle Stability Control) warning lights all illuminate and remain on continuously. Owner unsure if vehicle is safe to drive. Multiple owners report similar complaints across online forums.
When: Failure mileage not specified
Symptoms owners cite: ABS light illuminates; Brake warning light illuminates; Tire pressure warning light illuminates; Traction control off light illuminates; VSC (Vehicle Stability Control) light illuminates; All lights remain on simultaneously
Repairs/costs cited: Mechanic unable to provide diagnosis
Inverter Failure (Hybrid Model)
Inverter unit stalls while driving, causing all warning lights to illuminate. Vehicle restarts but will not move.
When: At approximately 55,000 miles
Symptoms owners cite: Inverter stalls while driving at approximately 25 mph; All warning lights illuminate; Vehicle can be restarted but will not move after stall
Repairs/costs cited: Vehicle required towing; was repaired (specific repairs not detailed)
Ignition Key Stuck—Will Not Turn
Key inserted into ignition will not turn. Vehicle required towing.
When: Failure mileage not specified
Symptoms owners cite: Ignition key will not turn after insertion
Repairs/costs cited: Vehicle required towing
Brake System and Wheel Locking (ABS-Related)
Rear passenger wheel locks up suddenly while driving on highway. Owner suspects traction/ABS control system malfunction. Owner reports similar complaints appear common online.
When: During highway driving
Symptoms owners cite: Rear passenger wheel locks up completely while driving; Wheel remains locked and must be dragged onto tow truck
Alternator Failure
Alternator fails, causing loss of electrical power and loss of vehicle control. Owner noted that battery was replaced 2 years prior but alternator had failed.
When: Failure occurred at 45 mph
Symptoms owners cite: Car loses electrical power and engine control; Vehicle slows and driver must pull to shoulder and stop; Alternator non-functional despite recent battery replacement
Air Bag Non-Deployment in Collision
During rear-end collision at 70+ mph where vehicle was pushed into car ahead, air bag warning light went off but air bags failed to deploy.
When: During collision event on 7/23/2011
Symptoms owners cite: Air bag light turned off; Air bags did not deploy during 70+ mph rear-end collision impact
Synthesized from 23 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Heater/ac functions intermittently then fails completely. Well know problem where placement of ribbon cable to potentiometer breaks loose, partially (intermittent failure), then completely (total failure). Quoted cost at any dealership $900-$1,000. I did repair myself in one hour for a cost of $10. Quick search on the web uncovered many many of same incident and, fortunately, detailed repair…
Had electrical trouble with your 2005 Toyota Highlander?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the electrical problem on the 2005 Toyota Highlander?
It's a meaningful issue. 23 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $850.
At what mileage does the electrical typically fail?
Across the 17 complaints that reported odometer mileage, most electrical failures cluster between 40,000 and 80,000 miles, with the median around 57,770. A quarter of owners report trouble before 40,000; a quarter make it past 80,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $850 for electrical repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to electrical?
No active recalls currently cover electrical issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2005/Toyota/Highlander.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.