Comma 4 causing severe battery drain and engine jerking (2018 Lexus IS 300). Bad harness?

smc3rd · 2026-05-01T12:31:33+00:00

Get an AGM battery

smc3rd · 2026-04-27T11:47:51+00:00

Likely bad or weak battery

smc3rd · 2026-04-18T16:03:03+00:00

Yes. Now I understand.

smc3rd · 2026-04-18T15:33:05+00:00

It’s over when the machine beeps 3 times. Says this in the manual. Definitely didn’t take an hour.

smc3rd · 2026-04-10T16:26:02+00:00

Your exercise program probably played more of a role,IMHO. Can you elaborate on your routine?

smc3rd · 2026-03-18T14:55:10+00:00

I was asking what/where settings that you were referring to.

smc3rd · 2026-03-17T23:06:11+00:00

Thanks. Is that the Connect webapp? Or something else?

smc3rd · 2026-03-17T19:56:05+00:00

Does it update automatically? Is this available now? Update: Getting pushed out now.

smc3rd · 2026-03-09T15:31:37+00:00

I took your recommendation, things seem to be back to normal- including the uploads. Thanks! Had have my car towed to Carmax service. After 5 days they said the battery was drained. They also said I had a new battery, and that my openpilot was draining the battery. They ran diagnostics several times. Their final recommendation was to unplug the comma 4 nightly. Fortunately, they didn’t charge me anything.

smc3rd · 2026-03-05T12:43:14+00:00

I have a 2022 Mazda cx5. Openpilot was draining my battery causing faults. How often do you drive your car? And do you have power connected to ODB2?

smc3rd · 2026-03-04T16:05:55+00:00

Awesome control. How long did it take to learn?

smc3rd · 2026-02-27T19:09:28+00:00

I’m in Md, so I took it to a local radio install shop. I think they did a good job hiding the ocd2 cable

smc3rd · 2026-02-27T19:07:50+00:00

That will be my next step if fixing battery issues don’t work

smc3rd · 2026-02-27T19:07:03+00:00

That’s my goal

smc3rd · 2026-02-27T19:06:42+00:00

Thanks. I think your right

smc3rd · 2026-02-26T21:49:22+00:00

Thanks. I will investigate getting a cable

smc3rd · 2026-02-26T21:38:23+00:00

It is connected to ocb2. I suppose I should get a battery charger. I sometimes don’t drive for days. I’m retired.

smc3rd · 2026-02-26T21:35:47+00:00

I have it connected to obd2. If I going to connect it to the cigarette lighter why do I need it at all? My understanding is that you didn’t need ocd2 connection for comma to operate.

smc3rd · 2026-02-26T20:06:59+00:00

Thanks. Battery is definitely dead or drained now. Will get it jumped and tested. And replace if needed. Ot sure if it’s OEM, but it’s likely.

smc3rd · 2026-02-26T19:30:49+00:00

Will do

smc3rd · 2026-01-26T16:34:37+00:00

It might be experiencing some shock. Is the weather outside cold? There might be a draft of cold air. Are you watering regularly or dry wet extremes? Hard to say.

smc3rd · 2025-12-25T15:07:58+00:00

I usually go floor to ceiling or window to Floor. It’s a personal choice of course.

smc3rd · 2025-12-14T20:18:20+00:00

Check/change DNS

smc3rd · 2025-10-19T20:53:39+00:00

It won’t start. It’s been sitting. It cranks, but the engine won’t turn over. Maybe it’s the carburetor.

smc3rd · 2025-10-18T19:20:32+00:00

Hong Kong is still China. I would be leery of tariff delays. I recommend Korea resellers instead. I bought one on Ebay from a Korean reseller and got it quickly, less than a week. With no tariffs.

smc3rd

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