Celica radio vs. ABS computer

Who has some ideas before I REALLY dig in on my kid's car.

1995 Celica in good condition with low-average miles. Recently the ABS check light started coming on, seemingly at random, with a variety of codes such as: Right Front wheel speed. Right Front sensor damaged. Right Rear wheel speed. Stop Light Circuit. Pulled the right front wheel and checked cabling. Visually OK. The other day the ABS light went OUT for a while and the brakes went into ABS mode during normal, conservative driving.

This seems to happen only when the radio is on. It has a sub-wolfer that was professionally installed a year ago.

Reply to
Jack Myers
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First, you need to verify that the wheel speed sensors on the corners indicated by the codes you had present are functioning normally. This includes, checking for chaffed wires, inspecting the sensor head for debris, checking the sensor rotor for damage or debris, and if possible make sure that you are getting a nice AC waveform from the sensor connector when the wheel is spun. The codes you mentioned aren't as shotgun as you think, they all seem to be pointing toward the fact that the speed sensors aren't able to get a consistent signal. The reason the ABS system engaged while you were driving is because the computer perceived different wheel speeds while braking and activated the system. Another cause of this on earlier systems is different sized tires due to wear. This can cause a difference in wheel speed and confuse the ABS computer. As far as the radio, check the basics first before you go hunting some bizarre correlation between these two unrelated systems.

Reply to
qslim

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