Camry :: 2002 Azura V6 Sound System Rebooting And Heater Fan Stop And Start


Aug 20, 2014

I have an intermittent electrical problem that I thought was the alternator but my mechanic says isn't. Every now and then the sound system will start rebooting and the heater fan may stop and start.

Normally voltage across the battery is about 13.8v or more. At times the car changes into the error state which continues until the car is restarted. It may then or may not re-enter the problem state.

When the car is in the state where the radio re-starts, the voltage across the battery drops to around 13.2v. The two big fans on the radiator start and stop according to the thermostatic control. It is this startup that causes the radio to restart etc. I got one flash on my multimeter of a drop to 12.8v across the battery on the start. This would be due to extra draw to start the fan motors and is usually too fast for my multimeter to react to.

Entering problem state might happen once a month. It seems more likely on long trips and is so intermittent it is hard to diagnose. Its start coincided with the replacement of the head unit with an after market one. I have checked repeatedly for loose wires behind that unit that are shorting out, now I am thinking it is somewhere in the charging circuit.

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