Electrical Problems PS,A/C,RADIO,SPEEDOMETER,SIGNALS,AIR BAG LIGHT ON, ALTERNATOR - Toyota Yaris Forums

CTScott · 06-24-2010, 12:13 PM

OK - I just finished doing some testing on Crashy and could not recreate the issue. I disconnected the alternator output (the large gauge wire going to the battery) and separately the alternator "signal" output (the 4 pin connector that gives the ECM, AC ECU, etc. info about the alternator state). In both cases Crashy started and ran fine, and everything worked (power steering, etc.)

So, based on that and my experience with us having a plant in Humacao, PR for a few years (and seeing things corrode like crazy even indoors), I would look at connector A27, which is the large black connector with a black and a white wire. It connects to the fusible link (the large plastic chunk attached to the positive battery terminal). The white wire supplies power to all of the body ECUs (AC, Power Steering, SRS, etc.)

A27 Battery Connector.jpg

I would also check the other end of that white wire, which is a ring terminal (connector 1D), which is located on the bottom of the under hood fuse panel.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
DIY (08' USDM Liftback): ESUSE Fog Light Install v2.0	goku87	DIY / Maintenance / Service	127	02-19-2023 07:01 PM
Electrical System Upgrade Advice	sqcomp	In Car Entertainment + Electronics (audio / video / alarm)	6	03-23-2016 01:15 AM
How many forum posters does it take to change a light bulb?	silver_echo	Off-topic / Other Cars / Everything else Discussions	25	06-27-2011 01:50 AM
LED'n it out (warning...big pics)	custom Lftback	Photo-Video-Media Gallery	9	05-24-2010 03:41 AM
solar trickle charger and alternator	wingdood	Fuel Economy Forum	33	10-12-2009 04:02 PM

06-24-2010, 12:13 PM	#9
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	OK - I just finished doing some testing on Crashy and could not recreate the issue. I disconnected the alternator output (the large gauge wire going to the battery) and separately the alternator "signal" output (the 4 pin connector that gives the ECM, AC ECU, etc. info about the alternator state). In both cases Crashy started and ran fine, and everything worked (power steering, etc.) So, based on that and my experience with us having a plant in Humacao, PR for a few years (and seeing things corrode like crazy even indoors), I would look at connector A27, which is the large black connector with a black and a white wire. It connects to the fusible link (the large plastic chunk attached to the positive battery terminal). The white wire supplies power to all of the body ECUs (AC, Power Steering, SRS, etc.) A27 Battery Connector.jpg I would also check the other end of that white wire, which is a ring terminal (connector 1D), which is located on the bottom of the under hood fuse panel.