OK, on the multimeter; 12.37V sounds ok but to be sure, you should measure it after a cold-crank test of 600 amps or so, then read the battery.

What happens with a weak battery (usually a bad cell) shows up when you start you car. The battery voltage dips so low (9 - 10V) that many times, various DTCs are set. One thing that happened to me regularly was that the windows lost their 'mind'.

Finally, I checked the battery, and after a cold crank test, the battery voltage was 12.15 volts. You may think that's ok but it's not! Replaced the battery and have NEVER had any 'strange' codes or window problems since.

I see you started another thread. Need to check your complete wiring harness. If the AMM (MAF) connection is bad, then you can take bets that the rest of the car's harness is also in bad shape, especially the ETA harness!

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Regards . . . . JimF
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'94 S500 Cpe

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