Electrical problem
2002 Dodge Ram V8 Four Wheel Drive Automatic 113000 miles

My battery went dead, after jump starting it, the trucks electrical went crazy. Wipers dont work, High beam indicator works but high beams wont. Turn indicator in the cab works but not outside. Brake lights are out. Head lights work when the ignition is on even when the switch is off (didn't do that before) Please Help
GARY

Hello Gary, may need some more info if this doesn’t fix it. There are several RAMs, a 1500, 2500, and 3500. Will need to know the exact engine also as there are different types, some based off of VIN Number. If you have not, go to Auto Zone or O’Reilly’s and for free they can bring a tester out to the car, hook it up and check your battery, alternator and starter. We first must know if your battery is good at all. A defective battery can cause electrical havoc to the car. Next, while you are there have them pull the codes for free and let us know. For now, if the battery is bad and you replace it, that may fix all of your other problems. Let us know.

Hello:
I went to auto zone and the diagostics code was P0601. This is from a 2002 Dodge Ram 1500 with a 5.9 Ltr engine. 4x4. Also noticed today that the horn doesnt work either. Thanks for helping.
GARY

Gary
I am a little concerned that during the battery jump start damage may have occurred to the Front Control Module FCM. I have attached some information for you. What I suggest is take the vehicle to Auto Zone or O’Reilly’s and for free, they can hook up a tester to check your battery, starter and alternator. You need to know make sure all of those (mainly the battery and alternator for now) are working fine. Also while there have them pull the codes on the vehicle and jot them down. Once you knew the battery/alternator were just fine, I would disconnect the battery and let the vehicle sit for about 5 minutes. Then hook it all back up again and see if you still have the problem. If you do, then I would check the power distribution relay as below. If that is good, you may need to take the vehicle in and have it checked. It may need to be flashed again or the board may be burnt up. Good luck and let me know.


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The Front Control Module is a micro-controller based module located in the left front corner of the engine compartment. On this model, the Integrated Power Module must be positioned aside in order to access the front control module. The Front Control Module mates to the Power Distribution Center to form the Integrated Power Module (IPM) . The Integrated Power Module connects directly to the battery and provides the primary means of circuit protection and power distribution for all vehicle electrical systems. The Front Control Module controls power to some of these vehicle systems electrical and electromechanical loads based on inputs received from hard wired switch inputs and data received on the PCI bus circuit (J1850).

As messages are sent over the PCI bus circuit, the Front Control Module reads these messages and controls power to some of the vehicles electrical systems by completing the circuit to ground (low side driver) or completing the circuit to 12 volt power (high side driver).

The following functions are Controlled by the Front Control Module:
• Airbag (Restraints) System
• Headlamp Power with Voltage Regulation
• Electronic Transmission Control Module Power
• Windshield Wiper "ON/OFF" Relay Actuation
• Windshield Wiper "HI/LO" Relay Actuation
• Windshield Washer Pump Motor
• Brake Shift Interlock System
• Fog Lamp Relay Actuation
• Park Lamp Relay Actuation
• Blower Motor Relay Actuation
• Accessory Relay Actuation
• Horn Relay Actuation
• Electronic Back Light (EBL) Rear Defogger
• Horn Relay Actuation
• Name Brand Speaker (NBS) Relay Actuation
The following inputs are Received/Monitored by the Front Control Module:
• B+ Connection Detection
• Power Ground
• Battery IOD
• Ambient Temperature Sensing
• Park Lamp Outage
• Ignition Switch Start Only
• Ignition Switch Run and Start Only
• Washer Fluid Level Switch
• Windshield Wiper Park Switch
• Brake Fluid Level Switch
• PCI Bus Circuit
• Brake Lamp Switch
• Flash Reprogramming Voltage
• Horn Switch


FRONT CONTROL MODULE
The Front Control Module (FCM) is a microprocessor-based electrical control and interface center located in the engine compartment. When it is mated to the Power Distribution Center (PDC) , it is referred to as the Integrated Power Module (IPM) . The IPM, with its fuses and relays provides power and signal distribution throughout most of the vehicle. The FCM receives hard-wired analog and resistor multiplexed inputs as well as digital electronic inputs from other electronic modules in the vehicle electrical system through its connection to the IPM and the Programmable Communications Interface (PCI) data bus network. Based on these inputs and programming, the FCM uses high side drivers to provide direct power feeds and low side drivers to provide relay control for some of the vehicle's most critical electrical systems.

The FCM provides the following features:

Controlled Feeds
Headlamp power
Windshield washer pump motor

Relay Controls
Accessory relay
Adjustable pedals relay (when equipped)
Fog lamp relay (when equipped)
Horn relay
Park lamp relay
Wiper ON/OFF relay
Wiper high/low relay

Electrical Inputs
Headlamp battery supplies
Module battery supply
Power ground
Ignition switch RUN or START position status
Ignition switch START Only status
PCI bus
Brake lamp switch
Wiper park switch
Washer fluid level switch
Brake fluid level switch
Ambient Temperature sensor
Right park lamp outage
Left park lamp outage
Battery IOD
Battery (+) connection detection
Flash reprogramming voltage


Power Distribution Relay
The relays are located in the integrated power module. For complete circuit diagrams, refer to Wiring Diagrams.
1. Remove the relay from its mounting location.
2. A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK, go to Step 3. If not OK, replace the faulty relay
3. Resistance between terminals 85 and 86 (electromagnet) should be 60.7 - 80.3 ohms . If OK, go to Step 4. If not OK, replace the faulty relay.
4. Connect a battery to terminals 85 and 86. There should now be continuity between terminals 30 and 87, and no continuity between terminals 87A and 30. If OK, perform the Relay Circuit Test that follows. If not OK, replace the faulty relay. Relay Circuit Test
1. The relay common feed terminal cavity (30) of the integrated power module is connected to battery voltage and should be hot at all times. Check for battery voltage at the fused B(+) circuit cavity in the integrated power module receptacle for the relay. If OK, go to Step 2. If not OK, repair the fused B(+) circuit to the integrated power module fuse as required.
2. The relay normally closed terminal (87A) is connected to terminal 30 in the de-energized position, but is not used for this application. Go to Step 3.
3. The relay normally open terminal (87) is connected to the common feed terminal (30) in the energized position. This terminal supplies battery voltage to the fused B(+) fuse in the integrated power module that feeds the accessory when the relay is energized by the ignition switch. There should be continuity between the integrated power module cavity for relay terminal 87 and the fused B(+) fuse in the integrated power module at all times. If OK, go to Step 4. If not OK, repair the open fused B(+) circuit to the integrated power module fuse as required.
4. The coil ground terminal (85) is connected to the electromagnet in the relay. It receives battery feed to energize the relay when the ignition switch is in the Accessory or Run positions. Turn the ignition switch to the On position. Check for battery voltage at the fused ignition switch output (acc/run) circuit cavity for relay terminal 85 in the integrated power module receptacle for the relay If OK, go to Step 5. If not OK, repair the open fused ignition switch output (acc/run) circuit to the ignition switch as required.
5. The coil battery terminal (86) is connected to the electromagnet in the relay. The integrated power module cavity for this terminal should have continuity to ground at all times. If not OK, repair the open ground circuit to ground as required.