Question about 2001 Dodge Ram 2500 Truck

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Body control module control not communicating with the over head compass trip computer

Over head trip computer temp dose not read right its off about 25 degrees

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  • Earl Norager
    Earl Norager May 07, 2014

    Hi Glenn Barlow, I want to help you with your problem, but I need more information from you. Can you please add details in the comment box? well when it u notice that temp was off was it cold and how cold so i can try to help you better Earl

  • Earl Norager
    Earl Norager May 07, 2014

    Hi Glenn Barlow, I want to help you with your problem, but I need more information from you. Can you please add details in the comment box? well when it u notice that temp was off was it cold and how cold so i can try to help you better Earl

  • Glenn Barlow
    Glenn Barlow May 07, 2014

    Hi Earl, I rplaced the temp sensor and it it red fine for a short time now it reads 52 instad of 85 temp out side so I am not sure if it's the body control module every thing else reads fine. Glenn

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  • Dodge Master
  • 14,585 Answers

It could be corrosion at the plug ends, either side. Or a bad wire. Bcm's and the console electronics are not protect from moisture/water. So it could be on the circuit boards also.

Posted on Nov 12, 2014

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SOURCE: my overhead console is not reading the temp right could it be the control module 2001 2500 dodge ram

could be the exterior temp sender unit these are usually mounted on the underside of the drivers door mirror or the display itself may be reading wrong get the OBD codes read as may tell which sensor is not reading correctly

Posted on May 03, 2014

Testimonial: "Steve I installed a new temp sensor and still have the same problem it reads 25 30 lower than outside temp. Glenn,"

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I have a 2010 Chevy impala LS instrument cluster and it has a 20 pin plug I'm trying to figure out which wire's on the back of the cluster are for the speed sensor, rpm, gas, and temp wires.


Boy your way off base . All the gauges are inputs from the ECM - engine computer . The VSS - vehicle speed sensor , ETC - engine coolant temp sensor , sending unit in the fuel tank , All this sensors input the engine computer . The PCM then sends this info on the GMLAN serial data bus ,communications network . The Instrument cluster has a microprocessor inside that translates this info an controls the gauges. You probably have an instrument cluster problem or a communication network problem . Your best bet is to take your vehicle to the dealer or some other qualified repair shop. Need to have it checked for DTC'S - diagnostic trouble codes.
Indicators and Warning Messages
Refer to Indicator/Warning Message Description and Operation.
Engine Coolant Temperature Gage
The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the engine coolant temperature. The IPC receives the coolant temperature information via serial data message from the body control module (BCM). The engine coolant temperature gage defaults to 60?°C (140?°F) or below if:
?€¢
The ECM detects a malfunction in the engine coolant temperature sensor circuit.

?€¢
The IPC detects a loss of serial data communications with the ECM.

?€¢
The IPC detects a loss of serial data communications with the BCM.
Fuel Gage
The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the fuel level percent. The body control module (BCM) sends the fuel level information from the ECM to the IPC via a serial data message indicating the fuel level percent. The fuel gage defaults to empty if:
?€¢
The ECM detects a malfunction in the fuel level sensor circuit.

?€¢
The IPC detects a loss of serial data communications with the ECM.

?€¢
The IPC detects a loss of serial data communications with the BCM.
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates in the IPC.
Odometer
The vehicle odometer is calculated and stored electronically in the instrument panel cluster (IPC). The IPC contains a season odometer and trip odometer A or B. Momentarily press the trip/fuel button in order to toggle between the season odometer and the trip odometer. Press the set/reset button for greater than 0.25 seconds, while the trip odometer is displayed, in order to reset the trip odometer. The IPC displays the vehicle mileage and trip mileage as determined by the engine control module (ECM). The IPC calculates the mileage based on the serial data vehicle speed information from the ECM. The odometer will display 'error' if an internal IPC memory failure is detected. The odometer displays either miles or kilometers and can be set through the customization menu in the driver information center (DIC).
PRNDL Display
The instrument panel cluster (IPC) displays the selected gear position as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the gear position. The PRNDL display blanks if:
?€¢
The ECM detects a malfunction in the transmission range switch circuit.

?€¢
The IPC detects a loss of serial data communications with the ECM.

?€¢
The IPC detects a loss of serial data communications with the body control module (BCM).
Speedometer
The instrument panel cluster (IPC) displays the vehicle speed as determined by the engine control module (ECM). The IPC calculates the mileage based on serial data vehicle speed information from the ECM. The IPC receives vehicle speed information from the body control module (BCM) via a serial data message. The speedometer defaults to 0 km/h (0 mph) if the IPC detects a loss of serial data communications with the ECM or BCM.
Tachometer
The instrument panel cluster (IPC) displays the engine speed as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the engine speed. The IPC receives the engine speed information from the body control module (BCM) via a serial data message. The tachometer will default to 0 RPM if:
?€¢
The ECM detects a malfunction in the engine speed sensor circuit.

?€¢
The IPC detects a loss of serial data communications with the ECM.

?€¢
The IPC detects a loss of serial data communications with the BCM.

How to Diagnose Controller Area Network CAN Suggest you read up on C.A.N.

May 14, 2016 | Cars & Trucks

1 Answer

Information display (compass and temp and trip details) in dash too dim to read in daylight


The head light switch has a wheel next to it to adjust the dash lights. If you don't have one, but have a knob switch, try turning it.

Feb 08, 2016 | 2008 Chrysler Town and Country

1 Answer

What does no bus mean on the odometer


No bus means the bus is not operating properly. It means no communication between the modules inside your jeep. All modules inside the jeep (A/C control, radio, onboard computer or trip computer, body control, etc) communicate with each other by means of a wire called bus. Check that wire.

Jun 24, 2014 | 2001 Jeep Grand Cherokee

1 Answer

How do i reset the compass on a 2006 dodge grand caravan


Hi Roger, I'm glad to help. Below is the procedure for resetting the compass on your vehicle.



COMPASS VARIATION ADJUSTMENT Compass variance, also known as magnetic declination, is the difference in angle between magnetic north and true geographic north. In some geographic locations, the difference between magnetic and geographic north is great enough to cause the compass to give false readings. If this problem occurs, the compass variance setting may need to be changed.
To set the compass variance:

1. Using the Variance Settings map, find your geographic location and note the zone number Figure 1.
22681.jpg Figure 1 - Variance Settings 2. Turn the ignition switch to the On position. If the compass/thermometer data is not currently being displayed, momentarily depress and release the C/T push button to reach the compass/thermometer display. 3. On Electronic Vehicle Information Center (EVIC) and Compass Mini-Trip Computer (CMTC) equipped vehicles depress the Reset push button and hold the button down until "VAR = XX" appears in the display. This takes about five seconds. On Compass Temperature Module (CT) equipped vehicles depress the C/T push button and US/M push button down until "VAR = XX" appears in the display. This takes about five seconds. 4. Release the push button(s). "VAR =XX " will remain in the display. "XX" equals the current variance zone setting. 5. On Electronic Vehicle Information Center (EVIC) and Compass Mini-Trip Computer (CMTC) equipped vehicles momentarily depress and release the STEP button to step through the zone numbers, until the zone number for your geographic location appears in the display. On Compass Temperature Module (CT) equipped vehicles depress the US/M push button to step through the zone numbers, until the zone number for your geographic location appears in the display. 6. On Electronic Vehicle Information Center (EVIC) and Compass Mini-Trip Computer (CMTC) equipped vehicles momentarily depress and release the RESET push button to enter the displayed zone number into the EVIC/CMTC module memory. On Compass Temperature Module (CT) equipped vehicles depress the C/T push button to enter the displayed zone number into the electronic module memory. 7. Confirm that the correct directions are now indicated by the compass.

May 17, 2014 | 2006 Dodge Caravan

1 Answer

When turning the key it would start sometimes but die right out. Other times you had to hold the key in the on position for 10 seconds or so and it would start. Headlights would sometimes flash and car...


I have seen similar "crazyness" caused by communications problems in the computer network. If you scn your entire computer network you will most likely find several "U - codes" (U1000, U1006, etc.) which indicate that modules are losing communication with other modules within the network.

These type of problems are usually caused by a faulty charging system (sulfated, shorted battery, bad alternator diodes, Loose/corroded battery cable connections, etc.) or loose or corroded connectors at one or more of the computer modules.

Scanning your computer network would be the place to start. The modules like to tell on one-another. For example: if the communication loss is in the body computer, the engine control module and/or the instrument panel module, and/or the antilock brake module will have codes saying that the body control module was/is not communicating. In this example, I would take a hard look at the connectors at the body control module.

If several of the modules are all reporting loss of battery voltage at the module, then I would suspect a battery cable, bad ground circuit, etc. Please note that the engine control module will usually NOT report this type of code because it does not use capacitors to keep it "alive" with the battery disconnected like some of the modules such as the body control module and the passive restraint module.

Oct 15, 2011 | 1994 Pontiac Grand Prix

1 Answer

The letter C is flasing in my dash board


The flashing "C" in the Instrument cluster if for the Compass. Here's the bulletine...

Subject: Compass Displays a Steady or Flashing "C" In Place Of Directional Heading
Models: 2008 Saturn VUE built on or after 11/09/2007
This PI was superseded to update Recommendation/Instructions. Please discard PIT4699.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern: The compass displays a steady or flashing "C" in place of directional heading.

To return to a normal heading display, press and hold the cluster stem for approximately 2 Seconds.

The displayed heading is not correct after driving for 30 seconds, use the following "Compass Calibration" routine.

Press cluster stem until the Season Odometer is displayed (Not Trip A or B).

Press and hold cluster Stem until the solid "C" is displayed. To the right of the "C" will be the "Zone". Refer to the variation zone map above for the correct setting. Turn the stem Right to increase, Left to decrease. It will take a few seconds for a change of zone to be updated in the display.

Once the Zone is correct, press the Stem to display the Flashing "C". Do not touch the Stem again until the direction is learned. Drive the vehicle in slow circles in an open area until you see a compass (oc tant) heading replace the flashing C.

Note: Vehicles built prior to 11/09/2007 were not built with a compass.

Recommendation/Instructions:
Engineering is aware of this condition and is in the process of root causing. It is known that the Remote Compass Module (RCM), Body Control Module (BCM) and Cluster hardware are not at fault, and these parts should not be replaced.

Reinforce with the PDI technicians that the Compass Zone and calibration is still required as part of PDI.

Hope helps (remember to rate and comment this answer).

Mar 07, 2011 | 2008 Saturn VUE

1 Answer

The letter "C" is flashing on the speedometer


The flashing "C" in the Instrument cluster if for the Compass. Here's the bulletine...

Subject: Compass Displays a Steady or Flashing "C" In Place Of Directional Heading
Models: 2008 Saturn VUE built on or after 11/09/2007
This PI was superseded to update Recommendation/Instructions. Please discard PIT4699.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern: The compass displays a steady or flashing "C" in place of directional heading.

To return to a normal heading display, press and hold the cluster stem for approximately 2 Seconds.

The displayed heading is not correct after driving for 30 seconds, use the following "Compass Calibration" routine.

Press cluster stem until the Season Odometer is displayed (Not Trip A or B).

Press and hold cluster Stem until the solid "C" is displayed. To the right of the "C" will be the "Zone". Refer to the variation zone map above for the correct setting. Turn the stem Right to increase, Left to decrease. It will take a few seconds for a change of zone to be updated in the display.

Once the Zone is correct, press the Stem to display the Flashing "C". Do not touch the Stem again until the direction is learned. Drive the vehicle in slow circles in an open area until you see a compass (oc tant) heading replace the flashing C.

Note: Vehicles built prior to 11/09/2007 were not built with a compass.

Recommendation/Instructions:
Engineering is aware of this condition and is in the process of root causing. It is known that the Remote Compass Module (RCM), Body Control Module (BCM) and Cluster hardware are not at fault, and these parts should not be replaced.

Reinforce with the PDI technicians that the Compass Zone and calibration is still required as part of PDI.

Hope helps (remember to rate and comment this answer).

Feb 11, 2011 | 2008 Saturn VUE

1 Answer

What does code ccd mean on overhead display 1997 dodge ram 2500 diesel 4x4 automatic?


It means "Crystal Clear Display" but in basic term its called a ccd bus, basically the OH console module is not communicating with body control module so you want to check power and ground pins or you just might have a bad module, sorry.
A self-diagnostic test is used to determine that the
compass mini-trip computer module is operating
properly electrically.

CCD communications test.
Following completion of these tests, the compass
mini-trip computer will display one of three
messages: “PASS,” “FAIL,” or “CCd.”

if the “CCd” message is displayed, the use of a
DRBt scan tool and the proper Diagnostic Procedures
manual are required for further diagnosis.


Jun 30, 2010 | 1997 Dodge Ram 2500 Club Cab

1 Answer

Flashing light on my dashboard for air conditioner and blower


Possible Solution 1 - Check your fuses2 - You can try disconnecting the battery for about 5 minutes to reset the onboard computer (Body Control Module BCM) which controls the items you mention. 3 - If that does not work, you can then try disconnecting (with battery disconnected for at least 30 mins to disarm airbag) and reattaching the wire connector to the BCM in case it has developed a bad connection - This is located under the dashboard on the drivers side. Should be a big square or rectangle connector with lots of wires and a bolt going through it. Unscrew the bolt and disconnect the connector from the BCM then reattach and screw the bolt back in.
The Body Control Module (BCM) supplies vehicle occupants with visual and audible information and controls various vehicle functions, To provide and receive information, the module is interfaced to the vehicle's serial bus communications network, the Chrysler Collision Detection (CCD) bus. This network consists of the powertrain control module (PCM), the Transmission Control Module (TCM) , the electro/mechanical instrument cluster (MIC) , the Airbag Control Module (ACM) , the Compass/mini-trip module and the Controller Antilock brake Module (CAB). The BCM is operational when battery power is supplied to the module. Ignition switch power is needed for ignition switch functions.
The BCM provides the following features: • Automatic door locks • Battery protection • Chimes • Compass/mini-trip support • Courtesy lamps • BCM diagnostic support • Door lock inhibit • Headlamp time delay • Ignition key lamp • Illuminated entry • Instrument panel dimming • Mechanical instrument cluster support • Power door locks (with/without remote keyless entry) • Sliding door memory lock • Vehicle Theft Security system (VTSS) • Windshield wipers / washers (front and rear)
http://autorepair.about.com/library/a/1c/bl546c.htm

Aug 13, 2009 | 1998 Dodge Caravan

1 Answer

Remote keyless entry, radio and power sliding door


I think the body control module is shorting out . The body control module can be over heating internally then shorted out. All the parts you mention have a circuit running to the body control module. I would have the vehicle checked for codes at a repair shop , then check the wiring to the body control module.
good luck

Sep 28, 2008 | 2000 Chevrolet Venture

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