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What does 89 cadillac bcm control - Vehicle Parts & Accessories

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Do you mean pcm?Power Control Module.

Posted on Oct 28, 2012

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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

2008 Cadillac SRX Why do right turn signals flash much faster than left? All bulbs are illuminated.


The turn signals on your vehicle are computer controlled by the BCM - body control module . The first place to start would be to hook up a scan tool that can access BCM DTC'S an data Parameters. If all the turn signal bulb's are good .
Turn Signal Lamps
Ground is applied at all times at G201 to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START position. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch circuit. Battery voltage is applied at all times to the BCM. The BCM then applies a pulsating voltage to the front and rear turn signal lamps. Ground for the front turn signal lamps is supplied at G104. The left rear turn signal lamp is supplied ground at G402 and the right rear turn signal lamp is supplied ground at G401.
High resistance some where in the turn signal circuit could also cause this type problem . Doing voltage drop testing on the circuit would find a problem of high resistance .

High Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

Oct 19, 2016 | Cadillac Cars & Trucks

1 Answer

Some lights stay on when the key is removed like the gear indicator light. What can cause this and can I add a battery toggle so I dont have to disconnect the battery every time I leave the car


I wouldn't do that given the complexity of electronic modules an data bus communication networks on this vehicle . Disconnecting batteries can cause modules to go to sleep an not wake back up . The ignition switch is an input to the BCM - body control module , the BCM turns on relays powering up systems on the vehicle .
The BCM executes the high power mode by grounding the controlled power relay coil control circuit of the CONTROLLED POWER relay whenever the BCM is awake. This circuit also is grounded for 15 minutes after you turn the ignition switch to the LOCK position in order to obtain the RAP function. After 15 minutes elapse, the BCM enter a sleepstate and transitions to the low power mode. The components under controlled power then receive any necessary voltage from the battery positive voltage circuit of the BCM. If the BCM is in the low power mode, and the BCM detects that the current exceeds approximately 2 amperes, the BCM wakes up and re-enters the high power mode. If the vehicle remains inactive with the ignition in the LOCK position and without any BCM wake-ups for a period of 3 days, the BCM deactivates the low power mode. The following components are under controlled power: There are probably DTC'S - diagnostic trouble codes stored in the BCM . A simple code reader can not read these , an has nothing to do with the check engine light . Battery Disconnect or Replacement Problems You may have been lucky so far disconnecting the battery .

Sep 14, 2016 | 2001 Cadillac Eldorado

1 Answer

Location of the liftgate control module on a 2013 Cadillac SRX


All of these functions like the liftgate are controlled by a module called the BCM (body control module), you need to have it self tested by the dealer to determine if the fault is in the liftgate motor or some other component.

Aug 09, 2016 | 2013 Cadillac SRX

1 Answer

My brake lights are staying on even when I unplug the brake light switch


The brake light switch is an input to the BCM - body control module , do you know about BCM'S - electronic module ?
Stop Lamps
When the driver presses the brake pedal, the switch contacts open and battery positive voltage is interrupted to the BCM. The BCM then supplies voltage to both the turn/stop lamp supply voltage circuit and trailer rear turn/stop lamp supply voltage circuits. The BCM also supplies voltage to the CHMSL though a dedicated circuit.

could have DTC'S stored in the BCM
DTC B3445 00: Stop Lamp Circuit
Circuit/System Description
The stop lamp switch is used to sense the action of the driver application of the brake pedal. The body control module (BCM) provides a low reference signal and a B+ reference voltage to the stop lamp switch. When the stop lamp switch contacts close indicating the brakes have been applied, the BCM will apply battery voltage to stop lamp relay control circuit and the center high mounted stop lamp (CHMSL). When the stop lamp relay receives battery voltage from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage to the STOP LAMPS fuse to illuminate the left and right stop lamps.

DTC C0277 00: Brake Pedal Position Sensor Calibration Not Learned
DTC C0297 00: Brake Applied Output Circuit
DTC C0890 00: Device Voltage Reference Output 3 Circuit Voltage Out of Range

In the event that DTC C0277, C0297, or C0890 sets as current in the body control module (BCM) is an indication of a possible internal BCM malfunction or programming error. There are no external circuits available to diagnose on this vehicle with respect to these DTCs.
Your best bet would be to take your vehicle to a qualified repair shop or the Cadillac dealer.

Jul 17, 2016 | 2008 Cadillac Escalade

1 Answer

2003 cadillac cts key stuck in ingnition no power to ignition or dash


Its the BCM mounted on the passenger side valve cover. Yes the body control mod is on the motor. The coil pack starts to fail, then emits a higher then norm electromagnetic fields and takes out the BCM bolted directly on the top of the passenger side coils. Under the column there is a small plastic screw that you remove then push up on the button to release the key.

Apr 17, 2013 | 2003 Cadillac CTS

1 Answer

NEED A COMPUTER NOT SURE WHERE IT IS AT ON THE ENGINE.


your car has two on-board computers a PCM ( power control module ) it is the worker and a BCM ( body control module ) it is the thinker, when you give a command to the car like turn on the lights you send a signal to the BCM by turning on a switch the BCM then send a command to the PCM which it then turns on the lights.

the PCM is located under the hood inside the air cleaner box.

the BCM is located on the electronics panel in the front of the trunk.

May 16, 2011 | 1996 Cadillac DeVille

1 Answer

Where is the computer located? ona 1993 cadillac seville


The pcm is located on the passengers side behind the glove box.There will be 2 computers one is the bcm and the other is the pcm.The bcm is the body control module.You will have to remove the glove box to remove the pcm.Get the part number and call the parts department at the dealership and ask them which one is which.I believe it is on the kick panel.Hope this helps.Good luck.

Aug 03, 2010 | 1993 Cadillac Seville

2 Answers

1990 cadillac wont start


It's your PATSII security system...Any good mechanic should be able to fix this for $50-100 WITHOUT REPLACING THE BCM (tell them I said so).
Good Luck

Jun 23, 2009 | 1990 Cadillac Eldorado

2 Answers

Digital cluster not working


I had same problem with my 89 cad. deville , I changed the BCM and since then no problems and everything works great now for over a year

Dec 17, 2008 | 1989 Cadillac Sedan DeVille

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