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What does the fuse labeled JB Power Mean? - Grand Cherokee Jeep Cars & Trucks

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Posted on Jan 02, 2017

moparhart
  • 245 Answers

SOURCE: I have a slow battery drain on a 2006 Jeep

Hi
Welcome
Jb power is Junction Block power
Here is a list of tests for this problom

IGNITION-OFF DRAW TEST The term Ignition-Off Draw (IOD) identifies a normal condition where power is being drained from the battery with the ignition switch in the Off position. A normal vehicle electrical system will draw from five to thirty-five milliamperes (0.005 to 0.035 ampere) with the ignition switch in the Off position, and all non-ignition controlled circuits in proper working order. Up to thirty-five milliamperes are needed to enable the memory functions for the Powertrain Control Module (PCM), digital clock, electronically tuned radio, and other modules which may vary with the vehicle equipment.
A vehicle that has not been operated for approximately twenty days, may discharge the battery to an inadequate level. When a vehicle will not be used for twenty days or more (stored), remove the IOD fuse from the Junction Block (JB). This will reduce battery discharging.
Excessive IOD can be caused by:

  1. Electrical items left on.
  2. Inoperative or improperly adjusted switches.
  3. Inoperative or shorted electronic modules and components.
  4. An internally shorted generator.
  5. Intermittent shorts in the wiring.
If the IOD is over thirty-five milliamperes, the problem must be found and corrected before replacing a battery. In most cases, the battery can be charged and returned to service after the excessive IOD condition has been corrected.
1. Verify that all electrical accessories are off. Turn off all lamps, remove the ignition key, and close all doors. If the vehicle is equipped with an illuminated entry system or an electronically tuned radio, allow the electronic timer function of these systems to automatically shut off (time out). This may take up to three minutes. See the Electronic Module Ignition-Off Draw Table for more information.
ELECTRONIC MODULE IGNITION-OFF DRAW (IOD) TABLE Module Time Out?
(If Yes, Interval And Wake-Up Input)
IOD IOD After Time Out Radio No 1 to 3 milliamperes N/A Audio Power Amplifier No up to 1 milliampere N/A Central Timer Module (CTM) No 4.75 milliamperes (max.) N/A Powertrain Control Module (PCM) No 0.95 milliampere N/A ElectroMechanical Instrument Cluster (EMIC) No 0.44 milliampere N/A Combination Flasher No 0.08 milliampere N/A 2. Determine that the underhood lamp is operating properly, then disconnect the lamp wire harness connector or remove the lamp bulb. 3. Disconnect the battery negative cable. 4. Set an electronic digital multi-meter to its highest amperage scale. Connect the multi-meter between the disconnected battery negative cable terminal clamp and the battery negative terminal post. Make sure that the doors remain closed so that the illuminated entry system is not activated. The multi-meter amperage reading may remain high for up to three minutes, or may not give any reading at all while set in the highest amperage scale, depending upon the electrical equipment in the vehicle. The multi-meter leads must be securely clamped to the battery negative cable terminal clamp and the battery negative terminal post. If continuity between the battery negative terminal post and the negative cable terminal clamp is lost during any part of the IOD test, the electronic timer function will be activated and all of the tests will have to be repeated. 5. After about three minutes, the high-amperage IOD reading on the multi-meter should become very low or nonexistent, depending upon the electrical equipment in the vehicle. If the amperage reading remains high, remove and replace each fuse in the Power Distribution Center (PDC) , one at a time until the amperage reading becomes very low, or nonexistent. (Refer to 04 - Vehicle Quick Reference/Fuse Locations and Types - Specifications) for the appropriate wiring information for complete PDC and TIPM fuse, circuit breaker, and circuit identification. This will isolate each circuit and identify the circuit that is the source of the high-amperage IOD. If the amperage reading remains high after removing and replacing each fuse and circuit breaker, disconnect the wire harness from the generator. If the amperage reading now becomes very low or nonexistent, diagnose and repair the Charging System as necessary. After the high-amperage IOD has been corrected, switch the multi-meter to progressively lower amperage scales and, if necessary, repeat the fuse and circuit breaker remove-and-replace process to identify and correct all sources of excessive IOD. It is now safe to select the lowest milliampere scale of the multi-meter to check the low-amperage IOD.
CAUTION: Do not open any doors, or turn on any electrical accessories with the lowest milliampere scale selected, or the multi-meter may be damaged.

6. Observe the multi-meter reading. The low-amperage IOD should not exceed thirty-five milliamperes (0.035 ampere). If the current draw exceeds thirty-five milliamperes, isolate each circuit using the fuse and circuit breaker remove-and-replace process in Step #5 . The multi-meter reading will drop to within the acceptable limit when the source of the excessive current draw is disconnected. Repair this circuit as required; whether a wiring short, incorrect switch adjustment, or an inoperative component is the cause.

Posted on Jul 13, 2010

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2 Answers

What can be done about the draining of the battery by the jb power fuse on the 2002 grand Cherokee right hand drive


What ? jb power fuse ? Why don't you say what jb is ? I'm assuming you mean junction box . Were not mind readers ! Regardless you have a parasitic draw on one of the circuits in the junction box , Hook up a amp meter between the negative battery post an negative battery cable . Shouldn't have more then 50 milliamp draw . Pull the fuse's one at a time till the drain goes away . Look at a wiring diagram for that circuit to see what all is on it . isolate an fix . Videos on youtube showing how to trouble shoot ! How To Perform Parasitic Draw Test EricTheCarGuy

Aug 27, 2016 | 2002 Jeep Grand Cherokee

1 Answer

Hi anyone know what number fuse is for cig lighter on a grand jeep cherokee 2003 please


which one, ???
cig or power outlets. there are 3. of them 2 front 1 rear.
the number is
fuse 26 runs cig relay. main feed
fuse 29 runs cig relay coil.
both are in the JB, junction box.
power outlet rear is fuse 27 PDC
power outlet front is fuse 9 JB.

May 12, 2016 | Jeep Cars & Trucks

1 Answer

No sound from radio -"No RDS" - nor CD nor tape.....


the fuse blew,
that is always what to do when any electrics die.
check fuses
same fuses for both radio options.
fuse 1 and 20.
fuse 2 is memory
fuse 1 is key on power, (bingo !)
in JB
JB is cab box. junction box.


26189555-t33w3bbgpyh0vajlnsh4jf0p-5-0.jpg

May 09, 2016 | 1999 Jeep Grand Cherokee

1 Answer

Pull jb power fuse15 stop drain no fan controls or radio


i cant under stand any of that.,i get JAB, and fuse 15
  • is this ?
  • battery drains over night? why did you say drain,if not.?
  • fuse 15 is ok. wild guess, sure, lots of loads, only a few fuse.
  • Hvac blower dead,
  • Radio dead
  • yes, the FSm does cover all that. sure.

id do the radio,so simple. 1 wire. for power, one fuse,
toss coin
03 GC WJ jeep it is zzzzz, slow internet on the beach
cant open free FSm. grrrrr
got it
jb f5 and 30 is Radio
f5 is only memory so fuse 30 is blown, why not test all fuses, keyon, 12v on both sides, and forget books. this works.

the blower is more complex. (controls)'

blower is pdc f1
and jb 20
looks yourself
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

free,posted over 100times now under GC

Jan 17, 2015 | 2003 Jeep Grand Cherokee

1 Answer

What is wrong when I pull JB Power #15 50 amp fuse the drain g


2003 jeep GC, or WJ jeep, it is..?
there are no 50a fuses in any JB,
there are just 4 in the PDC. engine bay.
so, JB is wrong, input to me.
ill assume F15 is correct, and not F3/7/12 in PDC
F15 feeds JB via a pink wire. (pk-wt)
this main F15 feed JB , F5,7,8,9 fuse in cab.

so pull fuse 5 to 9 there and the one that ends the drain
is the load that is leaking, (phantom drains)
easy, huh, just 4 fuse to pull.
Cab box, only. called JB on all jeeps.
jb fuse 5 is radio.
jb fuse 7 is HVAC zone control (heat?) skim mod. & auto head lamp sensor & BCM memory, (yes lots)
jb fuse 8 is (12 courtesy lamps , intrusion module(export) and VICS, vehicle info center(memory)
jb fuse 9, front12vdc power outlets (cig ports modern) Cell Phone arked there?

or login at alldata.com and see all that, in the wiring pages.

Jan 17, 2015 | 2003 Jeep Grand Cherokee

1 Answer

Clock and power locks dont work


Several to check--In Instrument Panel JB (behind left side of dash) Gauge Fuse 7.5Amp--Power Fuse 30Amp---Door Fuse 30Amp--ECU-1G Fuse 10Amp------In Engine Room JB (L/F Inner Fender Panel) Dome Fuse 7.5Amp

Mar 15, 2014 | Toyota Avalon Cars & Trucks

1 Answer

Which fuse controls the map lights in the 2002 jeep liberty


map light? and no symptoms..

the dimmers on the HL stalk. (held lamp , park dash dimmer)
if the power to the map is dead so will many other things be dead.
lost the 2002 operators guide, ?
in cars 1 fuse runs many things. thus my others dead comment.
why not be clear, , the overhead dome map light. say where
hand is, because many cars have dash map lamps, so.....
my hand is on the DOME light above and its what DEAD?
i log into alldata.com so can you.
i look at this schematic, and there are 2 lamps
MAP and cargo, map is the traditional DOME. lamp now MAP.
but they both use the same fuse. so are both dead.?front and rear?
or both stuck on? what are the symptoms.?

both lamps have manual direct control (sw) PUSH THEM ?
If not in manual mode, there are controlled by the BODY computer BCM..
both run off JB1, fuse 34.
now i bet the next question is where is fuse 34, well its in the JB.
and where is JB its at your left knee, (USA only LHD only. comments )
fuse 34 runs the foot courtesy lamps... are they dead?
and visor vanity.
there are 2 fuse boxes. one in engine bay and one in cab, some cars
3.
JB =means cab
PDC fuse box is engine bay, Jeep lingo...
JB is in plain view above left ankle, look down then up and left.
bingo JB.
the box had fuse and relay ID's
the operators guide shows , all the fuses and name.

i dont have the OP guide so cant find the name for Fuse 34.
but there is no need yet if the other lamps work then FUSE 34 is good.
and is 15amps.

Jan 22, 2014 | 2002 Jeep Liberty

1 Answer

Jb power fuse drains battery


The JB fuse under the hood is the power supply for the fuse box inside of the vehicle, if the battery drain goes away when JB fuse is removed is only because you have isolated the interior from the rest of the vehicle. These vehicles have issues with the body harness connector on the drivers side floor. To access the connector remove the rear seat and pull back the carpet, the connector is located directly below the drivers side rear seat bottom. Unscrew the 10mm bolt that holds the connector halves together and inspect for corrosion. If corrosion is present, repair as needed and your battery drain should go away.

Jan 23, 2011 | 2002 Jeep Liberty

2 Answers

No brake lights,have replaced all bulbs and brake light switch is good what left


you could just have abrake light switch problem located on your brake pedal. i have ran across a bad connection at the fuse box.

1. Check power in and out of the dash fuse box. Power comes in through connector JB-10 and goes out of JB-05 and JB-07, all White/Green wires. The connectors plug into the back of the dash fuse box. If there is power in and no power out, the problem is in the dash fuse box.

Nov 07, 2009 | Mazda 626 Cars & Trucks

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