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Rad 2 fan code r&r relays could relay wire harness be the problem

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If you would like help , some better information is needed . Also what make , model , year vehicle ?

Posted on May 05, 2017

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I have 2000 impala.. Code 0481 I've replaced the relay even though both fans turn on fine. I also swapped the plugs to see if I would get a fan 1 code and still got 0481. Any ideas?


DTC P0481Cooling Fan Relay 2 Control Circuit .
You swaped what plugs ? Fan's ? That wouldn't change anything ! You need to know how these duel fan set up's work . With this code the fans will still work in low speed , not high !
Output driver modules (ODMs) are used by the PCM to turn on many of the current-driven devices that are needed to control various engine and transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON. Unlike the quad driver modules (QDMs) used in prior model years, ODMs have the capability of diagnosing each output circuit individually. If an improper voltage level has been detected on ODM B output 2, which controls the high speed, relay 2, and series/parallel cooling fan relays, DTC P0481 will set.
Do you know how to do automotive electrical testing ?
Diagnostic Aids
Check for the following conditions:
• Poor connection at PCM -- Inspect harness connectors for the following items:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal to wire connections
• Damaged harness -- Inspect the wiring harness for damage.
• If the harness appears to be OK, disconnect the PCM, turn ON the ignition and observe a digital multimeter connected between the Fan Relay 2 driver circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the series/parallel fan relay and the high speed fan relay. A change in voltage will indicate the location of the fault.
If the DTC cannot be duplicated and is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set. Also refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.


Relay Driven Dual Cooling Fan Diagnostics

Apr 24, 2017 | Cars & Trucks

1 Answer

My car has 3 relays labeled rad fan 1, rad fan 2, and rad fan 3. When I took the 3 relays out and supplied 12v to them, rad fan 1 did not work. Do I just replace this or could it be something else?


When you apply power to rad fan 1 relay, is there power at the fan? If so, then indeed it's the fan, but until you check it, it could also be the wire...

May 28, 2015 | Cars & Trucks

1 Answer

Suzuki aereo 2004 cual es relay de abanicos donde


this is an English site. USA site and answers are USA cars.....

"2004 Suzuki air which is fan relay which is located"
i translated it for you.
which fan, the engine Radiator fan or the passenger cooling /heating fan. there are 3 fan systems, heater blower, RAD and A/C condensor
so? ill guess RAD or A/C

ill answer for, RAD fan relay, old post
it's the relay in the PDC, marked FAN. (if car is English car !)
fuse 23, but that runs many other things besides fan.
relay 1 runs the fans.
now A/C fan at the condensor way out front.
Fuse 12, and again runs many things.

fuse box 1, next to battery has 2 relays, #1 fan #2 fan for RAD

the condenser fan and compressor relays, right there same place.

SALUD !

Sep 15, 2014 | 2004 Suzuki Aerio

1 Answer

Radiator fan do not work


check the all the fuses under the dash and under the hood. if they are good then, you can disconnect the rad fan electrical connector at the fan, then using 2 jumper wires you can jumper the fan motor to see if the fan works. you jumper the fan motor just like you would jumping a car. if the fan runs then you will have to check the fan relay, sometimes you can use another relay in the relay box. if the fan doesn`t work then the rad cooling fan is defective and will have to be replaced.

May 04, 2014 | 1998 Dodge Caravan

1 Answer

I have to error code with my jeep grand Cherokee Laredo 1999 the code are 1491,1495,753,136


P1491 Rad Fan Control Relay Circuit An open or shorted condition detected in the radiator fan control relay control circuit. This includes PWM solid state relays.P1495 Leak Detection Pump Solenoid Circuit An open or shorted condition detected in the Leak Detection Pump (LDP) solenoid circuit.P0753 (M) Trans 3-4 Shift Sol/Trans Relay Circuits An open or shorted condition detected in the overdrive solenoid control circuit or Trans Relay Circuit in JTEC RE transmissions. Was MIL code 45. P0753 (M) Trans 3-4 Shift Sol/Trans Relay Circuits An open or shorted condition detected in the transmission 2-4 shift solenoid circuit (4-speed auto. trans. only).P0136 (M) 1/2 O2 Sensor Heater Circuit Malfunction Oxygen sensor heater element malfunction.

Aside from getting into an accident and having your wiring harness severely damaged, the other likely suspect is your PCM. These codes are not related to each other and indicate a much larger problem.

Nov 02, 2013 | 1999 Jeep Grand Cherokee

1 Answer

1999 Jeep Cherokee Sport wont shift into overdrive P1491


P1491 - Radiator Fan Control Relay Circuit Open Or Shorted

When monitored: with the ignition key on, battery voltage greater than 10.0 volts and
the pcm requests the radiator fan to be turned on.
Set condition: an open or shorted circuit is detected in the radiator fan relay control
circuit.

Possible causes
radiator fan ctrl rly circuit wire harn intermittent defect
radiator fan ctrl rly circuit wire harn observable defect
radiator fan relay ground circuit open
rad fan relay control circuit open
radiator fan relay control circuit short to ground
rad fan control relay defective
pcm defective

Check ot and keep us updared.

Oct 15, 2011 | 1999 Jeep Cherokee

1 Answer

Im stuck...I have an 04 Srt-4 and the Radiator Fans Havent been working period and with the California heat its making my car overheat quickly at idle. Ive taken the car to a shop and had a dianogstic ran...


hi, please check your radiator stat, you may have another on the head wich may be connected to the E C U. if you feel down the side of the rad. should find two connections into a small unit screwed into the rad. these sometimes burn out. to test if rad. stat is open circuit ( link the two terminals together this is only a temperature switch) i hope this infor. usefull gerry

Sep 07, 2010 | Dodge SRT4 Cars & Trucks

2 Answers

Where would I find the fan motor relay


The cooling fan relay on a 1996 to 2000 Plymouth Voyager The SSFR (Solid State Fan Relay) Cooling fan relay is located on the left front inner frame just behind the radiator. The radiator coolant fan relay is located on the inside front of the engine compartment near the left headlight assembly. You have to remove the air filter assembly, then look for a simple square relay with 4 wires running into it. It is mounted with 2 screws. It is the only relay at that location. If it has burned, you will need to replace the pigtail wiring harness.

Remove the air box beside the battery a 10 mm bolt and the relay is a four prong square box bolted on the frame with two 8mm bolts
www.autozone.com

May 26, 2010 | 1999 Plymouth Grand Voyager

1 Answer

I replaced my radiator cooling fan motors both of them on my Dodge Grand Caravan and i replaced the relay and fuse and coolant temparature sensor and my fans still won't work.


check for battery power at pin 4 of rad fan relay connector..ground at pin 1..jump pins 3 and 4..fans should work..if not,check harness about 3-4 inches away from relay connector..have seen these corrode..if fans work,the engine controller may not be grounding relay..any codes in engine controller?engine light on?

May 16, 2009 | 2000 Dodge Caravan

1 Answer

2005 vw jetta radiator cooling fan wont shut off


Check for a switch at lower part of rad. Should see a wire harness & plug on a sensor at bottom of rad. This sensor/switch also operates fan on/off according to coolant temperature. You may need to disconnect battery to get at it safely.

Jan 16, 2009 | 2005 Volkswagen Jetta

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