Weird failure to start

[papak]

The other night, we got in the car and coincidently turned on both seat heaters as I was pushing the Start button. Allmthe interior and exterior lights remained illuminated but I observed an amber "Check Engine" light as well as a red "Battery" light and The red "hybrid Battery" light above it. The car failed to start until I turned everything off and waited until all the interior and exterior lights went out. I then pushed the Start button and the truck started normally. I couldn't find any fault codes after the fact. No problems since.

I presume that the seat heaters and engine start were momentarily a bit too much for the circuitry. I replaced the original battery in December with a Delco AGM as a precaution. No problem registering it.

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[Ozarkbeard]

This truck's CAN bus does not like to multitask. Avoid trying to get the truck to do multiple tasks at once.

 

[The Real Maverick]

The other night, we got in the car and coincidently turned on both seat heaters as I was pushing the Start button. Allmthe interior and exterior lights remained illuminated but I observed an amber "Check Engine" light as well as a red "Battery" light and The red "hybrid Battery" light above it. The car failed to start until I turned everything off and waited until all the interior and exterior lights went out. I then pushed the Start button and the truck started normally. I couldn't find any fault codes after the fact. No problems since.

I presume that the seat heaters and engine start were momentarily a bit too much for the circuitry. I replaced the original battery in December with a Delco AGM as a precaution. No problem registering it.

Nope.
Just a computer glitch.
Seat heaters take about as much power as (incandescent) dome lights. Less power than one headlamp.

 

[Dr. No]

Nope.
Just a computer glitch.
Seat heaters take about as much power as (incandescent) dome lights. Less power than one headlamp.

Sir, I must respectfully disagree. The seats are heated by electric resistance heat. You cannot product that amount of heat over that amount of area with the same current that will illuminate an incandescent dome light.

 

[Bob zimmerman]

Sir, I must respectfully disagree. The seats are heated by electric resistance heat. You cannot product that amount of heat over that amount of area with the same current that will illuminate an incandescent dome light.

I agree with the disagreement. For that amount of heat on a seat warmer I’m guessing more than 5 amps and that’s conservative.

A hair dryer on high is about 10 amps.
A toaster is about 6 amps
An incandescent 60 watt bulb is about a half amp. .5 amps
Bob

 

[jonshep]

I agree with the disagreement. For that amount of heat on a seat warmer I’m guessing more than 5 amps and that’s conservative.

A hair dryer on high is about 10 amps.
A toaster is about 6 amps
An incandescent 60 watt bulb is about a half amp. .5 amps
Bob

You are mixing AC and DC voltages. A 60 watt seat heater at 12 volts DC will require 5 amps. A 60 watt incandescent bulb at 120 volts AC will require .5 amps. Watts=Volts * Amps

 

[Bob zimmerman]

You are mixing AC and DC voltages. A 60 watt seat heater at 12 volts DC will require 5 amps. A 60 watt incandescent bulb at 120 volts AC will require .5 amps. Watts=Volts * Amps

Yes I am, and for reference only And for laymen. But my answers and yours are identical.
Bob- 30 years in the electrical industry.

 

[The Real Maverick]

Sir, I must respectfully disagree. The seats are heated by electric resistance heat. You cannot product that amount of heat over that amount of area with the same current that will illuminate an incandescent dome light.

That much wattage continuously is a lot of heat.

A soldering iron of 10 watts reaches 500°F over a small area. Seat heaters of 20 to 40 watts distribute 100°F over a larger area. And they are well insulated. Once the heat is applied, it stays there. (For a long while at least)

Heated seats typically draw about 3–4 amps (about 40–50 watts) per seat. As a reference point, a typical halogen headlight bulb is about 55 watts on low beam.

 

[Dave O]

Looking for my “UGLY’S“ Electrical Book now?

 

[The Real Maverick]

Plus seat heaters are so dang efficient and such low wattage they are used extensively in EV's to extend battery range. It's the first tip EV owners learn on day one of EV ownership.

 

[HeyBales]

With ignition key, Acc mode still on 12V system.

Do seat/wheel heaters kick on then?

If it takes a click to On before they do then never mind, the DCDC Conv is supplying power then.

I've never been one that does the key insert and instant sweep to Start.
Just wondering if relays are going off quick enough to support extra items on 12V system before HVB is supplying that.

It seems the push-button start would equate to that fast sweep method going instantly to Start.

Hmmm - possible to get the gear selector quickly to Reverse also to see what sort of fun that provides?

 

[Dr. No]

Heated seats typically draw about 3–4 amps (about 40–50 watts) per seat. As a reference point, a typical halogen headlight bulb is about 55 watts on low beam.

Sorry to evoke anger (in the form of an emoticon), but a halogen headlamp is not a dome light, as originally argued. I agree less than a halogen headlamp, but an incandescent dome light?

 

[MakinDoForNow]

With ignition key, Acc mode still on 12V system.

Do seat/wheel heaters kick on then?

If it takes a click to On before they do then never mind, the DCDC Conv is supplying power then.

I've never been one that does the key insert and instant sweep to Start.
Just wondering if relays are going off quick enough to support extra items on 12V system before HVB is supplying that.

It seems the push-button start would equate to that fast sweep method going instantly to Start.

Hmmm - possible to get the gear selector quickly to Reverse also to see what sort of fun that provides?

If you plug a voltage monitor into the dash power point and then turn key to on the led shows the 12v voltage for about 1-1.5 seconds before the DCDC comes online and shows it's 14 to 15.4 (or whatever).

 

[The Real Maverick]

Sorry to evoke anger (in the form of an emoticon), but a halogen headlamp is not a dome light, as originally argued. I agree less than a halogen headlamp, but an incandescent dome light?

Don't you remember the old ones that had 2 to 4 filaments per fixture and often 2 fixtures?

 

[The Real Maverick]

With ignition key, Acc mode still on 12V system.

Do seat/wheel heaters kick on then?

If it takes a click to On before they do then never mind, the DCDC Conv is supplying power then.

I've never been one that does the key insert and instant sweep to Start.
Just wondering if relays are going off quick enough to support extra items on 12V system before HVB is supplying that.

It seems the push-button start would equate to that fast sweep method going instantly to Start.

Hmmm - possible to get the gear selector quickly to Reverse also to see what sort of fun that provides?

I do not believe the seat heaters kick on until the truck is "started". (Hybrid)

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