93 ls400- backlighting and cluster weirdness
03-13-20, 12:57 PM
#1
Driver School Candidate
Thread Starter
93 ls400- backlighting and cluster weirdness
Hi
My 93 ls400 odometer, outside temperature indicator and my backlight for radio and climate control are acting weird, the backlight will turn black and my odometer sometimes turns half black or goes to fahrenheit and comes back to celcius. same as in the outside temperature indicator. I'm just wondering is the signal coming from the ECU ? My car runs fine no engine code. Where should I start looking? Thanks to all for the help.I attached a video how this thing is acting up.
cheers
My 93 ls400 odometer, outside temperature indicator and my backlight for radio and climate control are acting weird, the backlight will turn black and my odometer sometimes turns half black or goes to fahrenheit and comes back to celcius. same as in the outside temperature indicator. I'm just wondering is the signal coming from the ECU ? My car runs fine no engine code. Where should I start looking? Thanks to all for the help.I attached a video how this thing is acting up.
cheers
Last edited by RA40; 03-13-20 at 08:48 PM. Reason: descriptive title
03-17-20, 05:25 PM
#4
Moderator
Those backlights are controlled by the rheostat. What happens when you set it a bit brighter or darker? I worry about the failing rheostat. It sometimes has a resistance glitch when aged.
The ECU for the engine/AT is not controlling the odometer directly. It is controlled by the independent processor/driver in the meter unit. See this post.
The ECU for the engine/AT is not controlling the odometer directly. It is controlled by the independent processor/driver in the meter unit. See this post.
Last edited by Yamae; 03-17-20 at 08:23 PM. Reason: To add a link
03-19-20, 08:23 AM
#5
Driver School Candidate
Thread Starter
Those backlights are controlled by the rheostat. What happens when you set it a bit brighter or darker? I worry about the failing rheostat. It sometimes has a resistance glitch when aged.
The ECU for the engine/AT is not controlling the odometer directly. It is controlled by the independent processor/driver in the meter unit. See this post.
The ECU for the engine/AT is not controlling the odometer directly. It is controlled by the independent processor/driver in the meter unit. See this post.
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