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How to installbcm & ground wire

How to install bcm & ground wire

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This is not very specific on the problem but, anything negative can attach to the frame as ground. I have no clue what you mean by "BCM".

Posted on Mar 29, 2014

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BCM fuse keeps blowing


Sounds like you may have a pinched wiring in the circuit where the fuse supplies power to. Might want to remove all the components that this circuit operates and one by one connect them. Once the fuse pops, you have isolated the circuit and all you need to do is follow the specific wiring to that bad circuit and find the problem.

Dec 18, 2016 | Cars & Trucks

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1999 Pontiac grand am horn goes off by itself and locks are locking and unlocking by themselves


Something going on with bcm. Note the diagram for the horn, one of the ground wires for control side of horn relay, goes to bcm. Probably part of security system. The other ground wire goes to horn button.
The bcm also has control over door locks. I can't diagnose your bcm from here.
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Nov 30, 2016 | 1999 Pontiac Grand Am

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How do i remove bcm in 2007 pontiac g6?


Why ? If you replace the BCM it will need to be programmed . Dealer !!
This vehicle's 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 .
Trying to save you some agravation an wasted time an money . For a do it yourselfer , this is nothing you should be messing with ! You don't have the training to be messing with the BCM .
A new body control module (BCM) must be programmed with the proper regular production option (RPO) configurations. The BCM stores the information regarding the vehicle options and if the BCM is not properly configured with the correct RPO codes the BCM will not control all of the features properly. The Tech 2 software will automatically prompt you with the various RPOs available for the vehicle. Ensure that the following conditions exist in order to prepare for BCM programming:
This entire procedure has been reviewed before starting
The battery is fully charged.
A CANdi module is installed between the vehicle and the scan tool.
The ignition switch is in the ON position.
The data link connector (DLC) is accessible.
All disconnected modules and devices are reconnected before programming.

Oct 23, 2016 | 2007 Pontiac G6

1 Answer

My trunk will not open. When I take off battery cable and replace, it opens once. Is there an easy fix? relay etc?


When the rear compartment lid release switch is pushed, the rear compartment lid release signal circuit to the body control module (BCM) is grounded. BCM then grounds the coil side of the trunk release relay through the trunk release relay control circuit. With this voltage is applied to the rear compartment lid release actuator, opening the rear compartment.
Rear Compartment Lid Release Relay
  1. Ignition OFF, disconnect the trunk relay.
  2. Test for 65-90 ohms of resistance between terminals 85 and 86.
  3. ?‡'
    If the resistance is not within the specified range, replace the trunk relay.

  4. Test for infinite resistance between the following terminals:
  5. ?€¢
    30 and 86


    ?€¢
    30 and 87


    ?€¢
    30 and 85


    ?€¢
    85 and 87


    ?‡'
    If less than infinite resistance, replace the relay.

  6. Install a 10-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Measure for less than 2 ohms of resistance between terminals 30 and 87.
?‡'
If greater than 2 ohms, replace the relay.


Rear Compartment Lid Release Relay Malfunction

  1. Ignition OFF, disconnect the trunk relay.
  2. Verify that a test lamp illuminates between the coil side B+ circuit of the trunk relay and ground.
  3. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the voltage control circuit for a short to ground. If the circuit tests normal, test or replace the trunk relay.

  4. Verify that a test lamp illuminates between the switch side B+ circuit of the trunk relay and ground.
  5. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

  6. Disconnect the harness connector at the rear compartment lid latch.
  7. Ignition OFF, test for less than 5 ohm of resistance between the rear compartment lid latch ground circuit and ground.
  8. ?‡'
    If greater than the specifed range, test the ground circuit for an open/high resistance.

  9. Connect a test lamp between the trunk release relay control circuit and the coil side B+ circuit of the trunk relay.
  10. Command the trunk release solenoid ON and OFF with a scan tool.
  11. ?‡'
    If the test lamp remains ON all the time, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.


    ?‡'
    If the test lamp remains OFF all the time, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

  12. Connect the harness connector at the rear compartment lid latch.
  13. Connect a 3-amp fused jumper wire between the switch side B+ circuit of the trunk relay and the voltage control circuit of the lid latch. Verify that the lid latch activates.
  14. ?‡'
    If the lid latch does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the rear compartment lid latch.

  15. If all circuits test normal, test or replace the trunk relay.
Component Testing
Rear Compartment Lid Release Switch
  1. Ignition OFF, disconnect the harness connector at the rear compartment lid release switch.
  2. Test for infinite resistance between the trunk release switch supply voltage and ground terminals with the switch in the open position.
  3. ?‡'
    If less than infinite resistance, replace the rear compartment lid release switch.

  4. Test for less than 2 ohms of resistance between the trunk release switch supply voltage and ground terminals with the switch in the closed position.
  5. ?‡'
    If greater than 2 ohms, replace the rear compartment lid release switch.

  6. Test for infinite resistance between each terminal and the lid release switch housing/case.
?‡'
If less than infinite resistance, replace the rear compartment lid release switch.


Could be the relay , could be the switch , could be a problem with the BCM !

Apr 17, 2016 | 2007 Pontiac G6 GT Convertible

1 Answer

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 .

Nov 24, 2015 | Saturn Cars & Trucks

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.
Power Mode Master
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

Sep 24, 2015 | Cars & Trucks

1 Answer

Passenger door locks don't unlock.


You need to understand how they work , do you know about automotive electronic controls ? Your switches are just inputs to the BCM - body control module !
Door Locks Power and Ground
For door lock operation, the IP Fuse Block supplies battery positive voltage, through the 15 amp DR LK/TRUNK fuse, to the BCM. The BCM uses this circuit exclusively to apply power to the door lock actuators. The BCM is also supplied a ground circuit, which it uses exclusively to ground the door lock actuators. When a door lock is pulsed, the BCM internally connects these two circuits to the appropriate lock and unlock control circuits to actuate the locking or unlocking functions.
When diagnosing door lock malfunctions, these circuits must not be confused with the other battery voltage and ground circuits of the BCM. The appropriate wiring schematic must be used to locate the correct circuits. Failure to identify the correct battery voltage and ground circuits of the BCM during diagnosis of door lock concerns may result in misdiagnosis and unneccessary parts replacement.
Passenger Door Unlock Operation
When the BCM detects a transition of either of the door lock switches to the Unlock position, it switches the door lock actuator unlock control circuits to voltage. Since the door lock actuator lock control circuit is at ground potential within the BCM, the passenger door lock actuators transition to the Unlock position.
The door lock actuator unlock control circuits are dedicated control circuits used only for the passenger door lock actuators. This is done so that the driver door may be unlocked individually before unlocking the passenger doors using a keyless entry transmitter or an automatic door unlock function, if programmed. When the keyless entry transmitter is used to unlock the passenger doors, the BCM requires a repeated unlock command before it performs the unlock function. However, when the unlock input is from a door lock switch, a single unlock command is all that is required to unlock all doors.

How to test computer controlled door locks

Sep 12, 2015 | 2006 Pontiac Grand Prix

3 Answers

What is a body control module on a 2005 Pontiac g6 3.5 v6


A BCM is a small computer processor that recieves various inputs from different circuits and supplies outputs to control them. Wipers,door locks,windows,ac system horn as well as numerous other output functions are controlled by this module

May 10, 2015 | Pontiac Cars & Trucks

1 Answer

Bcm location on a 1998 chevy blazer


I think your just on a wire that comes from the battery
& your dropping battery voltage, when you ground your
meter or test light

Put an AMP Meter in series with either battery cable
& use the 20 amp setting to start, then go to Milli-Amps

You shouldn't have more than 40MA if everything is sleeping
(modules etc) only the clock & keep alive memory

Sep 05, 2012 | Cars & Trucks

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