0004373: Repair engine cooler fan power lines - DM

ID	Project	Category	View Status	Date Submitted	Last Update

0004373	vehicle service	Toyota SERA	public	2021-09-11 23:45	2021-09-13 02:27

Reporter	DigitalMy
Priority	normal	Severity	minor	Reproducibility	have not tried
Status	assigned	Resolution	open

Summary	0004373: Repair engine cooler fan power lines
Description	It is not connected to wiring now. There is control signal to fan relay should be at overheat limit
Tags	No tags attached.

DigitalMy 2021-09-11 23:45 administrator	16400-11400.gif (87,384 bytes) 16400-11400.gif (87,384 bytes)

DigitalMy 2021-09-11 23:57 administrator ~0007078	As this wiring line goes to fan motor /16363-74030 through under hood fuse and relay box relay_fuse_EXY10.JPG (273,644 bytes)

DigitalMy 2021-09-12 10:58 administrator ~0007079 Last edited: 2021-09-12 21:46 View 7 revisions	ECU does not control fan. Wiring harness to fan comes from right side inner fuse box to external left fuse box under hood "01" /82111-18010C-J on the front (wire comes directly from nearby relay). Ground to motor is W-B line - from common ground +12V to motor is L-B line - from radiator fan relay (FR box) -> restored this line wire Radiator fan relay connects L-B line to W-G line (fuse 30A) to W-R line from main relay to W line (battery power +12V DC) Radiator fan relay coil takes power from IG2 B-R line and LG-R + LG-W switch lines (temperature and pressure breakers) There should be on ground line to relay EA2: 1) water temperature switch (located on another "engine" harness, near distributor and faced to rear, on the thermostat) : LG-W wire goes to high pressure switch through "EA2" connector GND is switch thread itself = engine body 2) high pressure switch located nearby - may be ignored here... LG-R wire goes to radiator fan relay coil magnet GND LG-W wire goes from water temperature switch through "EA2" connector connect these lines permanently (high pressure switch removed) EXY10_wiring_engine_.png (68,173 bytes) EXY10_wiring_engine_.png (68,173 bytes)

DigitalMy 2021-09-12 12:45 administrator	EXY10_wiring_engine_connectors_.jpg (349,811 bytes)

DigitalMy 2021-09-12 19:14 administrator ~0007080 Last edited: 2021-09-12 19:42 View 2 revisions	"L" color is bLue "LG" color is light green Fan relay is Denso B4 056700-4670 and it is normally closed model Found it is "burned" - fix by soldering iron failed, replaced with used original one. Radiator fan relay is the near (first) one in box marked "fan" Toyota /90987-03001 12V15A 4-pin: 1) B-R +12V to coil magnet from IG2 2) LG-R GND to coil from high-pressure switch 3) L-B +12V to motor (normally closed) 4) W-G +12V from fuse 90987-03001.jpg (11,601 bytes) 90987-03001.jpg (11,601 bytes)