January 19, 2025

Ron Ananian, The Car Doctor - January 18, 2025 - Hour 2 - Toyota Forerunner Instrument Cluster Problem - (855)560-9900 24/7 Hotline1/18/25 Hour 2 -

35 minutes

In this edition of Ron Ananian, The Car Doctor, a caller, Tim from Lincoln, Illinois, describes an intermittent issue with his 2010 Toyota 4Runner, where the instrument cluster malfunctions—gauges flash, and warning lights (like for ABS and 4WD) remain on, although the truck drives perfectly fine. This problem happens randomly and can go for months without recurring. Despite a visit to the dealership and diagnostics at a local store, no faults were found. The host suggests that the issue could be related to the instrument cluster’s power and grounding or a wiring problem, especially after Tim had a remote start installed. The conversation dives into the difference between OBD2 and manufacturer-specific codes, suggesting a deeper scan for communication errors. The host advises checking the remote start installation, power, grounds, and considering a cluster replacement or repair if necessary. The caller is reassured the issue isn't urgent but still needs addressing.

In the second segment, another caller, Dave from New Jersey, describes persistent indicator lights on his 1986 Nissan 300ZX, which may be linked to a failing alternator. The host suggests performing tests, like unplugging the alternator to see if the lights go out, which would confirm it needs replacement. He also discusses the risk of damaging the vehicle’s electronics if the alternator isn’t fixed, as faulty diodes can cause "dirty electricity" to affect the system. The alternator is deemed due for an overhaul, and the host stresses finding a good-quality replacement due to the car's age.

In the final segment of The Car Doctor radio show, host Ron Ananian discusses the increasing complexity of automotive batteries with Troy Henke, a product director at Clarios. They reflect on how cars have evolved since the simple 1972 Monte Carlo, highlighting how modern vehicles require more advanced batteries to support numerous electrical systems.

Henke explains that while most vehicles still use lead-acid batteries, newer designs, such as Absorbent Glass Mat (AGM) batteries, are becoming more prevalent. These batteries are crucial for managing the growing demand for power due to technologies like start-stop systems and a surge in electrical devices in cars, such as telematics, air conditioning, and radios. Over the past decade, the number of electrical devices in vehicles has tripled, and it’s expected to double again within five years.

The conversation also touches on the lifespan of AGM batteries. While traditional lead-acid batteries last about four to five years, AGM batteries may last longer if used in simpler applications. However, in modern vehicles with more power demands, the lifespan is similar to that of conventional batteries, typically around four to five years. Ultimately, the advancements in vehicle technology necessitate this increased battery strain, which consumers must accept as part of the cost of modern automotive features.