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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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Posted on Jan 02, 2017

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I need to know where the Body Control Module is located on a 2000 Cadillac Catera,


BCM Replacement
Replace the BCM only if diagnostics in this section directs you specifically to do so. Most system problems are traceable to faulty wiring, to connectors, or to components. The BCM itself is very reliable and is not likely the cause of a fault. Do not replace the BCM before performing a complete diagnosis or recurrence of the fault will likely occur. Note: Every input to the BCM is short to ground and short to battery protected. Every output from the BCM is short to ground and short to battery protected. Therefore, the BCM does not automatically need to be replaced when there is a short found in the wiring connected to it. Repair the wiring first, then check the system for any further problem.

BCM Programming
When a BCM is replaced, it must be programmed with the Vehicle Identification Number (VIN) of the vehicle that it is being installed in. The RadioTheftlock feature uses the VIN to verify that the radio has not been removed and improperly installed in another vehicle.
The programming of the BCM is accomplished by using a scan tool. The vehicles VIN is entered in the scan tool and then transmitted via a Class 2 physical message to the BCM. The BCM stores the VIN in EEPROM. The first communication between the BCM and radio re-arms the Radio Theftlock. To set up a new BCM, select SETUP NEW BCM from the BCM Special Functions menu and follow the instructions on the screen.

Body Control Module (BCM)
Mounted on the RH Kick Pad, behind the trim panel

Mar 28, 2018 | Cadillac Cars & Trucks

1 Answer

2007 HHR rear hatch will not unlock


Do you know how to test automotive electrical circuits ? Viewing wiring diagrams an using a DMM - digital multi-meter . Looking at a wiring diagram I see a relay ,L/GATE RELSE relay - # 18 underhood fuse box . It's controlled by the BCM - body contol module . The liftgate release switch is a input to the BCM . Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine size. Under system click on body & accessories ,then under subsystem click on tailgate release . Click the search button then the first blue link.

Pressing the Liftgate Release Switch closes a contact providing a ground for the Liftgate Release Switch Signal circuit. The BCM will detect the voltage drop and command voltage to be supplied to the Liftgate Release Relay Control circuit thus energizing the LIFTGATE RELEASE Relay which provides voltage to the Release Actuator releasing the liftgate.

Do you know what a DTC - diagnostic trouble code is ?
DTC B3265 01: Hatch Release Output Circuit Short to Battery
DTC B3265 06: Hatch Release Output Circuit Short to Ground or Open

B3265 01
This DTC will set when the BCM detects a short to battery in the liftgate release relay control circuit.
B3265 06
This DTC will set when the BCM detects an open or short to ground in the liftgate release relay control circuit.

VEHICLE RELAYS Testing from the relay base
VEHICLE RELAYS Operation Diagnosis

Mar 28, 2018 | Cars & Trucks

2 Answers

Chevrolet low beams don't work


Low beam relay , possibly . But without testing that would be a guess . Do you know what a wiring diagram is ? Do you own a DMM - digital multi- meter ? Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. Year , make , model and engine size . Under system click on lighting ,then under subsystem click on headlamps . Click the search button then the blue link. The first diagram is for the headlamp switch , you will see it is connected to the BCM - body control module .The BCM supply's a ground for the lo beam relay . At the relay testing can be done for B+ voltage at pin's 30 & 86 ,also control from the BCM can be tested too . If you are unfamiliar with automotive electrical testing , there are video's on youtube. Check out how relay's work as well .

Oct 25, 2017 | Chevrolet Cars & Trucks

1 Answer

Dome light switch is in right position and dome lights still do not come on. Is there a relay for control? on 2011 chevrolet silverado.


No relay , the BCM supply's power . BCM - body control module .
The interior lighting consists of 2 groups. The first group includes lamps that may not be dimmed.
• Courtesy/illuminated entry lamps
• Dome lamps
• Map lamps
• Reading lamps
• Vanity mirror lamps

Dome/Interior Lamp Switch Malfunction
Ignition OFF, disconnect the harness connector at the headlamp switch.
Test for less than 5 ohms between the ground circuit terminal 8 and ground.
? If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify the scan tool Ctsy. Lamp Actv. Reason parameter is Off.
? If the scan tool parameter is Manual or Manual Defeat, test the appropriate signal circuit terminals for a short to ground. If the circuit tests normal, replace the BCM.
• Manual terminal 12
• Manual Defeat terminal 9
Install a 3A fused jumper wire between the signal circuit terminal 12 and the ground circuit terminal 8. Verify the scan tool Ctsy. Lamp Actv. Reason parameter is Manual.
? If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
Install a 3A fused jumper wire between the signal circuit terminal 9 and the ground circuit terminal 8. Verify the scan tool Ctsy. Lamp Actv. Reason parameter is Manual Defeat.
? If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
If all circuits test normal, test or replace the headlamp switch.

Your best bet mite be to take to a qualified repair shop .

Aug 23, 2017 | Chevrolet Cars & Trucks

1 Answer

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

1 Answer

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

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

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

1 Answer

I have a 2000 Pontiac Grand Am and the interior stay on


Interior Lights Circuit Description
By using a feature called inadvertent power control, the body control module (BCM) supplies power to all of the following components:
• The courtesy lamps
• The dome lamps
• The rear view mirror reading lamps
• The instrument panel compartment lamp
• The rear compartment lamp
The left front door ajar switch turns the interior lamps on through the BCM by grounding CKT 394. When the left front door is open, the switch is closed. This condition provides a ground and a door open input to the BCM. The BCM then grounds the following lamps through CKT 156 in order to turn the lamps on:
• The courtesy lamps
• The dome lamp
• The rearview mirror lamps
The right front door ajar switch and the rear door ajar switches turn the interior lamps on by grounding CKT 395 from the BCM.
When the ignition key is removed from the lock cylinder, the interior lamps remain on for approximately 40 seconds.
The BCM provides an interior lamps-on delay after a door is opened. The lamps remain on for approximately 40 seconds or until the ignition switch is turned to the ON position. The 40 second lamps-on delay reduces to 4 seconds if a door is opened within 2 minutes of the ignition switch being moved from the ON position. The interior lamps immediately turn off when the vehicle begins to move.
The dome lamp OFF-DOOR-ON switch controls the dome lamp. When the switch is in the OFF position, the dome lamp remains off. When the switch is in the DOOR position, the dome lamp lights when a door is opened by the BCM grounding CKT 156. When the switch is in the ON position, ground is supplied through CKT 750. The rear view mirror reading lamps are controlled by the rear view mirror reading lamps switch or through CKT 156 from the BCM.
Voltage is supplied at all times to the BCM through the INT LPS fuse. The BCM supplies voltage to the interior lamps through CKT 1732.

Battery Run Down Protection
When the ignition switch is in the OFF position, the BCM turns off the power to all of the interior lamps after 18-22 minutes.
The BCM will reset the inadvertent power control relay output when one of the following actions is performed:
• Open or close a door.
• Turn the ignition switch to the ON position.
• Turn off any interior lamps that may be on.
• Press the power door lock switch/keyfob button.
• Press the decklid release keyfob button.

Courtesy or Dome Lamps Always On
Step
Action
Yes
No
1
Did you perform the Lighting Systems Diagnostic System Check?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Lighting Systems
2
Use the Scan Tool in order to command the courtesy lamps OFF.
Do the courtesy lamps turn OFF?
YES - Go to Step 4
NO - Go to Step 3
3
Test for a short to ground in the courtesy lamps control circuit (156). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - System OK
NO - Go to Step 7
4
Test for a short to ground in each door jamb switch circuit:
• Circuit 394-Driver door
• Circuit 395-Passenger door(s).
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - System OK
NO - Go to Step 5
5
Test each door jamb switch for proper operation. Refer to the following:
• Open switch with the door closed
• Closed switch with the door open
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find a malfunctioning door jamb switch?
YES - Go to Step 6
NO - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
6
Replace the malfunctioning door jamb switch. Refer to Door Jamb Switch Replacement in Doors.
YES - Is the repair complete?
NO - System OK
--
7
Important: Perform the set up procedure for the body control module.
Refer to Body Control Module (BCM) Programming/RPO Configuration .
Replace the body control module. Refer to Body Control Module Replacement in Body Control System.
Did you complete the replacement?
System OK
Instal the door jamb switch wire harness.
Install the door jamb switch (2).

Feb 24, 2018 | 2000 Pontiac Grand Am GT

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