Question about 2011 Toyota Tacoma

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Will I damage or confuse the BCM (Body Control Module) in my 2011 Toyota Tacoma by adding an additional lighting circuit ?

I have added aftermarket running boards to my 2011 Toyota Tacoma. The running boards are lighted and the general instructions that came with the running boards say they should be hooked into the dome light circuit. I am concerned that this will confuse or damage the BCM (Body Control Module). Is this a valid concern? If so, can I still add the lights and what can I do to protect the BCM or not create other electrical problems by 'confusing' the BCM?

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  • Beverly Kennedy Feb 21, 2012

    I am thinking of hooking to dome lights so they will come on when the door is opened. The dome lights come on slowing from dim to bright (1 sec) and I guess are controlled by the BCM module. That is why the concern. Don't want to blow that. Any additional thoughts?

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You can connect them to your running lights,they just need to run off any power.doesnt matter where you get it from,but if you want them to come on with the lights thats what i would do.un less you power a switch an run the running boards from the switch.just more work that way,also you have to hit the switch everytime at night.

Posted on Feb 21, 2012

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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.

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03 Saturn ion brake lights won't go off and sumtimes engine want start and sumtimes it start run 5 secondsand quit


Hi Travis , lets see if we can help you ! First off here is a description of how the brake light circuit works , you need a good understanding of how it works before you can fix it.
Stop Lamps
The 15-amp STOP fuse located in the body control module (BCM) supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to both left and right stop lamp assemblies and the center high mounted stop lamp (CHMSL), through the BCM. The stop lamps are grounded at G401 and G403.
Do you know what a BCM is ? The body control module ! An electronic module .Just like the PCM/ECM - engine computer but for the body thing's ,light's , anti-theft system ,power door lock etc..
The body control module (BCM) has a bussed electrical center integrated into the housing. Body control relays and fuses are installed directly on the BCM which simplifies wiring and junction blocks on the vehicle. The body control system consists of the BCM and its associated controls. Battery positive voltage is provided to the BCM from the instrument panel (I/P) BATT 2 fuse in the Underhood fuse block. The module grounds are wired to ground G201 and G301. The BCM is wired to the Class 2 serial data communication bus as well as discrete input and output terminals to control the functions of the vehicles body .
With starting problems an the brake lights problem you may have a BCM problem , could have DTC's - diagnostic trouble codes stored in the BCM . This would have to be checked at a GM dealer or some other independent repair shop with a professional grade scan tool .
The ignition switch is an input to the BCM , when it receives a start input the BCM energizes the run / crank relay an other things !
Relay Controlled Power Mode
The BCM uses the discrete ignition switch inputs Off/Run/Crank, Accessory and Run/Crank to distinguish the correct power mode. These circuits are also routed to the Run/Crank and Accessory relays for relay controlled power feeds during the appropriate power mode.
Run/Crank Relay The relay uses a Hot At All Times B+ power source derived from the underhood electrical center. The Run/Crank relay supplies a power signal to the following circuits when the a Run or Crank power mode is selected:
?€¢
Backup lamp circuit


?€¢
Electronic brake control module (EBCM)


?€¢
Engine control module (ECM)


?€¢
Ignition control module (ICM)


?€¢
Park neutral position switch


?€¢
Transmission circuit 1 and 2


This is not something for a do it yourselfer , this is dealer or like I said a independent ASE certified repair shop .

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1 Answer

Where is the body control module on 2006 HHR


Body Control Module (BCM)
Under the I/P below the radio on the right side of the center console.
Do you know what the purpose of the BCM is ?
The body control module (BCM) has a bussed electrical center integrated into the housing. Body control relays and fuses are installed directly on the BCM, which simplifies wiring and junction blocks on the vehicle. The body control system consists of the BCM and its associated controls. Battery positive voltage is provided to the BCM from IBCM BATT 1 fuse and the IBCM BATT 2 fuse in the underhood fuse block. The module grounds are wired to ground G201, G203 and G305. The BCM is wired to the GMLAN High speed serial data buss, and the GMLAN Low speed serial data buss, as well as discrete input and output terminals to control the functions of the vehicle's body.
Serial Data Gateway
The body control module (BCM) in this vehicle functions as a translator between the High and Low speed GMLAN busses. The 2 communication protocols use the BCM to translate communicated serial data messages between the control modules over the 2 serial data busses.
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This vehicles body control module (BCM) functions as the power mode master (PMM). Refer to Power Mode Description and Operation for a complete description of power mode functions.
Serial Data Power Mode Master
On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle, the PMM is the body control module (BCM). The PMM receives 3 discrete ignition switch signals to differentiate which power mode will be sent over the Serial Data circuits. The 3-wire Ignition Switch table below illustrates the state of these inputs in correspondence to the ignition switch position:
Relay Controlled Power Mode
The body control module (BCM) uses the discrete ignition switch inputs Off/Run/Crank, Accessory, and ignition 1, to distinguish the correct power mode. The ignition 1 circuit is also routed to the Run/Crank relay for relay controlled power feeds during the appropriate power mode. The BCM, after determining the desired power mode, will activate the appropriate relays for that power mode.
Reprogram the body control module (BCM) after replacement. Refer to Control Module References .




Do you

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1 Answer

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1 Answer

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DTC B2527 Front Fog Lamps Circuit Low
The body control module (BCM) monitors the front fog lamp switch signal circuit in order to determine when the fog lamp relay is to be energized. When the BCM senses that the front fog lamp switch signal circuit is grounded momentarily by pressing the fog lamp switch, the BCM energizes the fog lamp relay by grounding the fog lamp relay control circuit.

Your best bet , take it to the dealer . Could need BCM replaced , would need to do testing using the Tech 2 scan tool . A new BCM has to be programmed .

Body Control Module (BCM) Replacement
If the body control module (BCM) is replaced, the following procedures must be performed in the following order:
BCM Reprogramming--Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integrating Systems.
Important: This procedure has to be performed only for vehicles equipped with the Passlock™ System.
Theft Learn--Refer to Programming Theft Deterrent System Components in Theft Deterrent. A new BCM will learn the Passlock™ information automatically, but the powertrain control module (PCM) must still learn the theft information from the BCM.

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1 Answer

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Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS and BCM faults and others) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module

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Ok supper Dave , let's get this stright , when you turn the key to start the vehicle , what happens ? The starter spins the engine or doesn't spin the engine ? This would be a no crank no start condition . if the engine does spin an doesn't start an run this is a crank no start condition . Now which is it ? The factory radio is hooked to the serial data communication network , did you or who ever installed the aftermarket radio use a interface module ? Are you familiar with the electronics on this vehicle ? BCM - body control module , low current inputs from the ignition switch which determine what mode to put the vehicle in ?

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Sorry but I am a GM Tech . have been for over thirty years , Cadillac , Buick an Chevy .audio buds think it's something else. Your audio buds don't have a clue ? When change something you better well know what your messing with. .

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If so, it is rather expensive to replace.

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