Electrical Issues After Jumpstart Mishap

CMC · August 28, 2014

Hi,

Long story but while jumpstarting a friend's car the jump leads were connected the wrong way round with ensuing sparks etc.

Since then my IS250 has 'issues'.

The display says check VSC, with the accompanying red triangle.

The remote isn't locking or unlocking the doors and the remote boot button doesn't work (but the lock all doors button on the drivers inside door panel does)

The traction control off dash warning light is on and the switch does nothing

AFS Off light is on and the switch does nothing.

It starts -I haven't run it so not sure if it is in limp mode.

Most other electrics seem to be working.

I've checked the fuses that seem to relate to the bits not working and they seem fine.

Any suggestions?

Cheers.

Chris

is200 Newbie · August 28, 2014

Have you tried reading the error codes ?

ChumpusRex · August 28, 2014

Disconnect the Battery. If a charger is available, stick a charger on the disconnected Battery for a couple of hours.

The reconnect the Battery and see what happens.

It's possible that the reverse jump start has confused some of the electronics, and they just need rebooting.

Car electronics are meant to be designed to withstand a reverse jump start, but even so, it is possible that some electronics could be damaged.

If after a reboot, things aren't working, try getting someone with a techstream scanner to read the codes off it.

is200 Newbie · August 28, 2014

Would disconnecting the Battery effectively reset the ECU and as a result reset / clear the codes or would it store some?

ChumpusRex · August 28, 2014

Disconnecting the Battery will clear the codes. However, if the fault is still present, then the codes will come back within 3 or 4 engine starts.

CMC · August 31, 2014

Hi just a quick update.

I tried the suggestions (thanks) and disconnected the Battery overnight and charged it.

Unfortunately in the morning it was the same.

Then the keyfob started to work, locking the car. But not the unlocking! Thankfully I remembered the hidden keyhole.

So I went to my local Lexus dealer to book it in - it is due a service anyway.

The service manager said it sounded like the dome fuses (I think that is what he called them) which are below the engine fusebox. I assume they are the fixed ones under the see through panel.

Anyway. Got in it this morning. And everything is back to normal!? No warning lights or Check VSC, locking and unlocking etc. All as it was before.

So maybe it was just its way of getting me to book it for a service....

Thanks for the help.

Makk · May 19, 2017

On 8/31/2014 at 6:59 AM, CMC said:

Hi just a quick update.

I tried the suggestions (thanks) and disconnected the battery overnight and charged it.

Unfortunately in the morning it was the same.

Then the keyfob started to work, locking the car. But not the unlocking! Thankfully I remembered the hidden keyhole.

So I went to my local Lexus dealer to book it in - it is due a service anyway.

The service manager said it sounded like the dome fuses (I think that is what he called them) which are below the engine fusebox. I assume they are the fixed ones under the see through panel.

Anyway. Got in it this morning. And everything is back to normal!? No warning lights or Check VSC, locking and unlocking etc. All as it was before.

So maybe it was just its way of getting me to book it for a service....

Thanks for the help.

Hi, i have the same problem as you. so you just need to replace the fusible link only right? no reprogrammed or anything else? thanks

CMC · May 19, 2017

Hi,

Actually, I didn't replace anything in the end. It just righted itself overnight.

Not helpful I appreciate, but if you have a similar problem then try the fuses. Whether it needs any reprogramming or not I'm afraid I can't say.

Chris

RoddysLexusLife · May 24, 2017

Probably fried it for a hot sec, just needed time to right itself. Ive noticed that these is220s have mood swings sometimes. I had a VCS light pop-up for a day...the next day I wanted to get it plugged in, I started it the morning and everything was fine. I took it anyways and it had 0 stored faults. I didnt remove the Battery leads or anything.