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  • Cars & Trucks Master
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Before somebody can help you you need to give us the make and model number. You have the unit and know what it is, we don't.

Posted on Nov 29, 2014

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Posted on Jan 02, 2017

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SOURCE: I have a 2001 Dodge Cummins 2500. When I Turn on the lights, the engine dies. It's showing codes 1693,1694, and 1689. The scanner said, No comm. between ECM and IPM. ECM detected it could not com

The first thing I would do is check the alternator for output. It should be about 13.5 volts at idle. Then have someone turn on the headlights and see what the reading is. It should drop some momentarily but should go back up to your original reading. Use a separate ammeter, not the one on the dash to get an accurate reading. I would suspect there is a problem in your alternator, likely a burnt diode, or wearing out, but it may also be the belt is loose, not enough tension. Insufficient power from your charging system could give the codes you are seeing. Uf there isn't sufficient power for the truck to run with the lights on then the ECM and IPM would not be able to communicate.

Posted on Nov 22, 2014

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Where is the body control module located on 2002 cadillac deville


The body control system consists of the following 3 modules:
• The Dash Integration Module (DIM)
• The Instrument Panel Module (IPM)
• The Rear Integration Module (RIM)
Each of the 3 body control modules integrate a number of functional systems under the control of a single module. Each module is connected to the Class 2 serial data circuit, many of the control functions are implemented by Class 2 messages.

What system (S) are you having problems with ?
Rear Integration Module (RIM)
The various RIM inputs and outputs are described in the corresponding functional areas as indicated on the RIM electrical schematics.
The RIM functions include the following:
• Automatic level control
• CIGAR relay control
• Class 2 communication requiring RIM interaction
• Content theft deterrent
• Fuel door control
• Fuel level sensor input
• Heated seat control
• HVAC blower control
• LK/CYL relay control
• Park brake relay control
• Rear defog relay control
• Rear park assist chime control
• Retained accessory power (RAP) relay control
• Reverse relay control
• Transmission shift inhibit
• Trunk release relay control
• Various controls for the interior lamps

Instrument Panel Integration Module (IPM)
The various IPM input and output circuits are described in the corresponding areas as indicated on the IPM electrical schematics.
The IPM functions include the following:
• 54 volt VF display input
• Ambient light sensor input
• Class 2 communication requiring IPM interaction
• Fog lamp switch inputs
• Front HVAC air delivery controls
• Front HVAC sensor inputs
• Front HVAC temperature controls
• Fuel door and rear compartment lid release switch input
• Hazard switch input
• HUD active control
• Instrument panel lamps dimmer switch input
• Ignition switch headlight control
• Interior lamps switch input
• Key in ignition switch input
• Traction control switch input
• Twilight sentinel delay input

Dash Integration Module (DIM)
The various DIM input and output circuits are described in the corresponding functional areas as indicated on the DIM electrical schematics.
The DIM functions include the following:
• Class 2 communication requiring DIM interaction.
• Control of exterior lamps.
• Control of front fog lights.
• Control of the headlights.
• Headlamps on with wiper input.
• Hood ajar switch input w/export.
• Horn relay control.
• Interior lamps incandescent dimming.
• Low side temperature for HVAC compressor.
• Power moding control over Class 2 serial data circuit.
• Reverse lockout solenoid control.
• Steering wheel controls input.
• Storage of the clock settings and, sending a message out on the class 2 serial data circuit in response to requests from other modules.

Jun 19, 2017 | Cadillac Cars & Trucks

1 Answer

Where Is the serial data class 2 module located, in my 2001 Cadillac deville?


A class 2 serial data bus is a communication network between control modules on the vehicle ! It is not a single module . The PCM/ECM - engine computer , ABS - air bags , BCM or in the case of your Caddy three computers make up the BCM , DIM ,RIM and the IPM . Your best bet would be to take your vehicle to a qualified repair shop .

Dec 06, 2016 | 2001 Cadillac DeVille

1 Answer

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

How to fix no communication between ECM and IPM


spray all the connectors with some wd40 to start with try not to pool it.

Nov 28, 2014 | Cars & Trucks

1 Answer

I have a 2001 Dodge Cummins 2500. When I Turn on the lights, the engine dies. It's showing codes 1693,1694, and 1689. The scanner said, No comm. between ECM and IPM. ECM detected it could not...


The first thing I would do is check the alternator for output. It should be about 13.5 volts at idle. Then have someone turn on the headlights and see what the reading is. It should drop some momentarily but should go back up to your original reading. Use a separate ammeter, not the one on the dash to get an accurate reading. I would suspect there is a problem in your alternator, likely a burnt diode, or wearing out, but it may also be the belt is loose, not enough tension. Insufficient power from your charging system could give the codes you are seeing. Uf there isn't sufficient power for the truck to run with the lights on then the ECM and IPM would not be able to communicate.

Nov 22, 2014 | Dodge Cars & Trucks

1 Answer

What is code B2799


This Diagnostic Trouble Code (DTC) is output when the Engine Control Module (ECM) detects errors in communication between the Transponder Key Electronic Control Unit (ECU) assembly and the ECM, or in the communication lines. This DTC is also output when an engine start is attempted while the ECU communication ID between the transponder key ECU assembly and the ECM is different.
Possible causes Faulty Key Faulty transponder key amplifier Faulty Transponder Key Electronic Control Unit (ECU) Transponder key amplifier wire harness Faulty Engine Control Module (ECM)

Mar 02, 2013 | 2007 Lexus ES 350

1 Answer

I got a code from auto zone that is i believe UO 101 AND UO105 OR UA101 AND UA105 WHAT do these codes stand for


These codes are communications code errors:

The UO101 is a transmission communication error: poor communication to your transmission ECM / computer

The UO105 is a fuel injection communication error: Poor communication to your fuel injector ECM/ computer.

Jun 15, 2011 | 2006 Dodge Stratus

1 Answer

Where is the fuse box on the under dash?


There is no under dash fuse block in this vehicle, only the one under the hood. Here is the description from Dodge.


DESCRIPTION The Integrated Power Module (IPM) is a combination of the Power Distribution Center (PDC) and the Front Control Module (FCM). The IPM is located in the engine compartment, next to the battery. The PDC mates directly with the FCM to form the IPM. The PDC is a printed circuit board based module that contains fuses and relays, while the FCM contains the electronics controlling the IPM and other functions. This IPM connects directly to the battery positive through a four pin connector. The ground connection is through two other connectors. The IPM provides the primary means of voltage distribution and protection for the entire vehicle.

Jan 30, 2011 | 2005 Dodge Caravan

1 Answer

Where is the ECM found on a 2001 Chrysler Town & Country?


The ECM module is located inside the engine compartment, driver side, in front of the battery and IPM FUSE & RELAY CENTER, right behind the driver side Head Light.

Oct 26, 2010 | Chrysler Town & Country Cars & Trucks

1 Answer

1998 Cadillac STS with IPM U1255 code history. what does this code mean?


U1255 - Class 2 Communication Malfunction (Serial Data Line Malfunction)

here is a link to all of the codes for your caddy
http://myweb.accessus.net/~090/dtcobd2n.html#net

Aug 20, 2009 | 1998 Cadillac Seville

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