Radio/CD suddenly dead - Toyota Yaris Forums

bobolinko · 09-01-2012, 02:34 PM

OK, heres thescoop:
Since we started the discussion, I got enough motivation to jump in and try the installation of a diode to the 12v Constant supply wire. I had considered a switch or diode and went with the diode to have less hassles in the future. I cut the constant supply feed line and soldered in a small rectifier (3 amp) and heat shrinked insulation on it. Installed the radio, and all the presets still were intact. removed the battery and serviced both ground and positive terminals which took about 20 minutes. Waited about another 15 minutes and re-connected the battery terminals. The head unit's presets were still intact! I am sure there is a cap in the head unit that keeps the volatile memory alive during periods of disconnection. I cannot understand why Scion had not intalled a 75 cent rectifier in the harness to make life so much easier for it's buyers! If the Yaris has no facility for this, an installed cap and diode would surely do the trick! All is now good, and thanks CT- for kicking me over the edge to do the mod! The Band side (Cathode) goes to the HU and the other end to the wiring harness.

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09-01-2012, 02:34 PM	#7
bobolinko Bob Drives: Yaris and Scion XD 5 spd BSP Join Date: Dec 2009 Location: Was Hawaii - Moved to Everett WA Posts: 145	OK, heres thescoop: Since we started the discussion, I got enough motivation to jump in and try the installation of a diode to the 12v Constant supply wire. I had considered a switch or diode and went with the diode to have less hassles in the future. I cut the constant supply feed line and soldered in a small rectifier (3 amp) and heat shrinked insulation on it. Installed the radio, and all the presets still were intact. removed the battery and serviced both ground and positive terminals which took about 20 minutes. Waited about another 15 minutes and re-connected the battery terminals. The head unit's presets were still intact! I am sure there is a cap in the head unit that keeps the volatile memory alive during periods of disconnection. I cannot understand why Scion had not intalled a 75 cent rectifier in the harness to make life so much easier for it's buyers! If the Yaris has no facility for this, an installed cap and diode would surely do the trick! All is now good, and thanks CT- for kicking me over the edge to do the mod! The Band side (Cathode) goes to the HU and the other end to the wiring harness.