LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Radio and Keyless entry doesn't work - 98 LS400

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Old 08-25-14 | 09:49 AM
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Default Radio and Keyless entry doesn't work - 98 LS400

I have a 98 LS 400 all factory original.

This morning the keyless entry doesn't work. I tried using both remotes, and replaced the remote battery.

Once I got into the car, it started fine. I pushed the volume **** on the radio to turn it on, and the radio will not turn on.

Both the radio and keyless entry worked yesterday.

I have checked the radio fuses and they are fine.

Has anyone experienced this problem?

Thank you for your help!
John
Old 08-25-14 | 02:01 PM
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check all the fuses. and replace the radio fuses or test them for continuity to confirm they're good. visual only check is not enough.
Old 03-22-15 | 04:46 PM
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I have islolated this problem to something on the Dome fuse circuit that has power when the key is off.

The fuse blows as soon as I put it a new fuse.
The doors are closed
ignition is off
key is NOT in the ignition
hood is open.

What circuits have power on the dome circuit with the key off and the door closed? Somewhere there is a short that has power when the key is off. I can;t locate the short.

Thank you for any help!
Old 07-18-15 | 04:18 PM
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I am at my wits end with this problem. I still can't figure out the problem.

I removed the radio and unplugged all the radio wires.
I disconnected the wires to the two visor vanity mirrors.
I don't have the optional factory cell phone.
I removed all the bulbs in all the interior lights.

The Dome still blows.

What else can I do to find the short?

Help!

Last edited by johnls400; 07-18-15 at 06:01 PM.
Old 07-18-15 | 05:35 PM
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Garage door opener is on that circuit too.
Old 07-18-15 | 06:02 PM
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Originally Posted by johnls400
I am at my wits end with this problem. I still can't figure out the problem.

I removed the radio and unplugged all the radio wires.
I disconnected the wires to the two visor vanity mirrors.
I don't have the optional factory cell phone.
I removed all the bulbs in all the interior lights.

What else can I do to find the short?

Help!
Sounds like a dead Keyless/Multiplex body computer.
One side of the dome light is always connected to the battery via 7.5A Dome fuse which also supplies the DC12V to the Keyless computer as well as to the audio unit. The Keyless computer is connected to the Multiplex body computer. That is way I suspect one of these are drawing too much current and opens the fuse.

Last edited by Yamae; 07-19-15 at 12:43 AM. Reason: To add to explain connected units.
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