1994 4x4 4.3L type W. Where is the BCM located?

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PART COLOR LOCATION 12 VOLT CONSTANT RED (+) @ IGNITION SWITCH HARNESS STARTER YELLOW (+) @ IGNITION SWITCH HARNESS STARTER 2 N/A IGNITION 1 PINK (+) @ IGNITION SWITCH HARNESS IGNITION 2 WHITE (+), See NOTE #6 @ IGNITION SWITCH HARNESS IGNITION 3 N/A ACCESSORY/HEATER BLOWER 1 ORANGE (+) @ IGNITION SWITCH HARNESS ACCESSORY/HEATER BLOWER 2 N/A KEYSENSE LIGHT GREEN (-) @ IGNITION SWITCH HARNESS PARKING LIGHTS ( - ) WHITE (-) @ BCM, LIGHT BLUE plug, Pin A5, See NOTE #4 PARKING LIGHTS ( + ) BROWN (+) @ BCM, LIGHT BLUE Plug, Pin B6, See NOTE #4 POWER LOCK LIGHT BLUE (TYPE A) @ BCM, BROWN plug, Pin A4, See NOTE #4 POWER UNLOCK WHITE (TYPE A) @ BCM, BROWN Plug, Pin A3, See NOTE #4 DOOR TRIGGER See NOTE #2 @ BCM, See NOTE #4 DOMELIGHT SUPERVISION TAN (-) @ BCM, PURPLE Plug, Pin B4, See NOTE #4 TRUNK RELEASE N/A SLIDING POWER DOOR N/A HORN BLACK (-) @ STEERING COLUMN HARNESS TACH WHITE (AC) @ ECM, See NOTE *2 WAIT TO START LIGHT DARK BLUE (-), See NOTE #5 @ INSTRUMENT CLUSTER BRAKE WHITE (+) @ SWITCH ABOVE BRAKE PEDAL FACTORY ALARM DISARM LIGHT GREEN (-) @ BCM, PURPLE plug, Pin B3, See NOTE #4 ANTI-THEFT YELLOW (+), ORANGE/BLACK (-) and RED/WHITE (Not used) GM's PASSLOCK 2 System, these wires exit the Ignition Switch Tumbler together and are in the Main Ignition Switch Harness in the Column. EXTRA INFORMATION NOTE #1: This vehicle is equipped with the PASSLOCK 2 ANTI-THEFT SYSTEM and will require a 791 Bypass Module for Remote Starting, to order go to the SECURITY BYPASS MODULE Page on this website. NOTE #2: This vehicle has 2 door trigger wires, the DRIVERS DOOR is a TAN (-) PURPLE plug, B4 and ALL OTHER doors BLUE/WHITE (-) LIGHT BLUE plug, Pin B11 at the BCM use both Door Trigger wires and DIODE ISOLATE when connecting to an ALARM SYSTEM, to connect, See DIAGRAM. NOTE #3; The ECM (Engine Control Module) is located near the battery, down low, between the fender and the fan, under a BLACK plastic cover. On the 4.3L engine it is in a 20 pin connector labled RED. On the 4.8L, 5.3L and 6.0L engines it is located at Pin 10 in the RED connector NOTE #4: The BCM (Body Control Module) is located behind the drivers side of dash, with the plugs facing the rear of the vehicle. NOTE #5: when hooking up a remote starter, if you cannot get the (+) or (-) Wait to Start wire on the Remote Starter to work properly, you will then need to disconnect this wire and Program the Remote Starter for the 5, 10, 15 or 20 Second Wait to Start Timmer in the Installation manual. NOTE #6: IMPORTANT !!!!! this wire MUST BE CONNECTED as IGNITION #2 for REMOTE STARTING!!!!!!

Holy Moly, lots of editing for clarity including a vehicle that doesn't exist :>D '98 olds slyatche'.


Take the Advice from Jeff Armer. He is _the_ Pro Expert here and has access for factory diagnostic flowcharts.
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The BCM is located on the back side of the Junction Block (fuse panel located to the left of the steering wheel). To get to it you'll need to remove the Junction Block and then unscrew the BCM from the back of it.
Oct. 13, 2006

Where is the BCM located? - LOST JEEPS • View topic

Videos as well

https://www.google.com/search?q=09+jeep+patriot+BCM+Location

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Doesn't have one , the BCM - body control module supply's voltage to the brake light's . Brake pedal position sensor is a input to the BCM .The BCM has battery voltage supplied from BCM fuse IBCM 1 fuse -fuse #20 30 amp ,located in the under hood fuse box.
Stop Lamps
The body control module (BCM) is responsible for controlling the stop lamps. When the driver presses the brake pedal, the BCM will receive a signal from the brake pedal position sensor. The BCM then supplies battery positive voltage to both left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The stop lamps are grounded at G401 and G403. The CHMSL is grounded at G302.

The brake pedal position sensor receives a low reference signal and a 5-volt reference signal from the BCM. Whenever the brake pedal is applied, the brake pedal position sensor applies a variable voltage signal to the BCM through the stop lamp switch signal circuit. Brake pedal position sensor calibration must be performed after the brake pedal position sensor or body control module (BCM) have been serviced. The calibration procedure will set brake pedal position sensor home value. This value is used by the BCM to determine the action of the driver applying the brake system and to provide this information to the vehicle subsystems via the class 2 communication bus.

Hooking up a factory or someother professional type scan tool an checking for DTC'S - diagnostic trouble codes in the BCM would be a good idea . If the brake light's are not working .

BCM Identification
This vehicle is equipped with 1 of 3 types of BCMs. The BCM type installed on this vehicle is based on the vehicle equipment, point of sale, and option content.
Refer to On-Board Diagnostic Features for more information on how to identify the BCM type installed by using the on-board diagnostic feature. The following identifies the functions and basic option content of all 3 BCM types:
BCM Type 2
BCM type 2 is the base BCM that provides all standard BCM functions. Refer to the BCM function table for type 2 BCM.
BCM Type 3
BCM type 3 provides all of the features of the BCM type 2 plus keyless entry. Vehicles with RPO AU0 are equipped with a BCM type 3.
BCM Type 4
BCM type 4 provides all of the features of the BCM type 2 and type 3 plus content theft deterrent. Vehicles with RPO AU0 and UA6 are equipped with a BCM type 4.

On-Board Diagnostic Features
This vehicle is equipped with an on-board diagnostic feature capable of performing the following functions:
• Feature Customizing
• Displaying DTC codes
• Clearing DTC codes
• Input/Output Diagnostics
Feature Customizing Mode
The feature customizing mode is used to configure the BCM to function in various applications. The BCM can be customized to change the following vehicle functions:
• Interior Lighting Features
• Door Lock System
• Keyless Entry System
• Content Theft Deterrent System
In order to enter the feature customizing mode perform the following steps:
Turn the ignition switch to the LOCK position.
Remove the BCM PRGRM fuse.
Turn the ignition switch to the ACC position.
When entering the feature customizing mode, the BCM first identifies what type of BCM is installed on the vehicle by flashing the fasten seat belts indicator and sounds the chime 2, 3 or 4 times depending on the type of BCM used on the vehicle. There are 3 different types of BCM that can be installed on the vehicle based on the vehicle option content that matches the BCM capabilities. Ensure that the BCM installed on the vehicle is compatible with all of the features on the vehicle. Refer to Body Control System Description and Operation for BCM identification.
For more information on features that can be customized, refer to Personalization Description and Operation in Personalization.
Displaying DTC Codes
The DTC codes can be displayed by entering the diagnostics mode. Clearing DTC codes and Input/Output Diagnostics are also available in the diagnostics mode.
Complete the following steps in order to enter the diagnostics mode:
Turn the ignition switch to the LOCK position.
Remove the BCM PRGRM fuse.
Turn the ignition switch to the ACC position.
Quickly turn the ignition switch from the ACC position to the LOCK position then back to the ACC position within 1 second.
The BCM will enter the on-board diagnostic mode and flash the fasten seat belts indicator and sound the chime equal to the number of DTCs stored in the BCM memory. If no DTCs are stored, the BCM will not flash the fasten seat belts indicator or activate the chime.
The BCM flashes and sounds the first DTC with the lowest number, pauses, then continues with the next DTC until all of the DTCs are read. With a DTC 1, the BCM will only sound the chime once, and the fasten seat belts indicator may not flash. Once all of the DTCs are read, the BCM repeats this sequence 3 times.
Important: If the fasten seat belts indicator does not flash, and the chime does not sound, complete the following procedure in order to confirm that the BCM has entered the diagnostics mode:
Ensure that all of the vehicle doors are closed.
Open and close any vehicle door.
Fasten and release the driver seat belt.
The BCM sounds the chime when receiving an input signal such as Drivers door, Passengers door opening or turning on the courtesy lights when the BCM is in the diagnostics mode. Make sure these inputs are working correctly in order to prevent a false diagnoses.
If the BCM does not sound the chime upon opening a door or turning on the courtesy lights, repeat Step 1 of Entering the diagnostics mode. If the BCM does not enter the diagnostics mode, then refer to Cannot Enter BCM Diagnostics .
Clearing DTC Codes
After entering the diagnostics mode press and hold the Unlock switch for 4 seconds. The BCM will erase all history DTC codes. If a circuit is still shorted, the BCM will immediately store a history DTC code.
Input/Output Diagnostic Mode
After the BCM reads all of the DTCs in the memory, the BCM enters the Input/Output Diagnostic Mode.
The BCM flashes the fasten seat belts indicator and sounds the chime once when any of the following inputs are activated:
• Courtesy lamp switches
• Door lock cylinder switches
• Driver door ajar switch
• Headlamp switch
• IP compartment lamp switch
• Keyless entry request for door lock/unlock
• Keyless entry request for the alarm (RPO UA6)
• Passenger door ajar switch
• Power door lock switches
• Liftgate ajar switch
• Sliding door ajar switches
• Shock sensor
• Hazard switch
Perform the following procedure in order to test the BCM outputs:
Ensure that the BCM is in the diagnostic mode. Refer to Entering On-Board Diagnostic Mode.
Cycle the interior light switch ON then OFF.
The BCM will enter the Output Diagnostic Test Mode 1.
Each cycle of the interior light switch ON/OFF will select from following test modes depending on BCM type:
• Test Mode 1-- De-activates the courtesy lights output and removes power to all of the interior lamps.
• Test Mode 2-- Activates the courtesy lights output and provides power to all of the interior lamps. Interior lamp override switch must be ON.
• Test Mode 3-- Activates the courtesy lights output and turns ON all of the courtesy lamps. Interior lamp switch must be ON.
• Test Mode 4-- Activates the theft deterrent relay for 1 second and turns ON the headlamps. BCM type 4 only.
• Test Mode 5-- Energizes the horn relay for 25 ms. BCM type 4 only.
• Test Mode 6-- Turns on the security LED indicator. BCM type 4 only.
• Test Mode 7-- Turns off the security LED indicator. BCM type 4 only.
When the BCM completes all test modes, the BCM will repeat the test mode sequence.
Exiting Diagnostics
Perform the following procedure in order to exit the BCM diagnostics mode and return to normal BCM operation:
Turn the ignition switch to the LOCK position.
Reinstall the BCM PRGRM fuse.
Turn the ignition switch to the RUN position.
© 2018 General Motors Corporation. All rights reserved

None of the door power lock's work ? Not from any switch ? F32 - 15 amp fuse location - body control module (BCM) . Probably not a fuse issue , door locks are controlled by the BCM controlling relay's located inside the BCM . This relay's are PCB - printed circuit board relay's , non serviceable . Your best bet , take it to a qualified repair shop .

Power Locks
The Body Control Module (BCM) monitors the door lock control switches. When the BCM receives an unlock/lock command from either door lock control switch, the BCM energizes a relay (internal to the BCM ) to supply the correct power and grounds for the door lock actuators.

Remote Keyless Entry (RKE)
The Remote Keyless Entry (RKE) feature is controlled by BCM . The BCM receives the RKE inputs from the Tire Pressure Monitor (TPM) module over the Medium Speed Controller Area Network (MS-CAN) . When any RKE transmitter button is pressed, the signal is received by the TPM module internal antenna. The TPM module then filters the RKE signal received to make sure it is a programmed transmitter. If the signal received is from a programmed transmitter, the TPM module sends the RKE command to the BCMover the MS-CAN . The BCM then interprets the RKE command and activates the corresponding output.
The BCM requests the illuminated entry feature to turn the interior lamps on when an unlock command is received. If a lock command is received, the illuminated entry feature turns off. The BCM then supplies voltage to the appropriate door lock actuator(s) to lock or unlock the doors. The RKE transmitter can also be used to activate the panic alarm. On vehicles with memory, the RKE transmitter also causes the BCM to send a MS-CAN message to the Driver Seat Module (DSM) to activate all memory features to the positions associated with the RKE transmitter being used.

Visual Inspection Chart

Mechanical Electrical

• Door handles
• Binding latch mechanisms

• Body Control Module (BCM) fuse(s):
  • 18 (10A)
  • 20 (20A)
• Wiring, terminals or connectors
• Door lock control switches
• Keyless entry keypad
• Integrated Keyhead Transmitter (IKT)
• BCM

Do you know what DTC'S are ?
DTC Charts
GO to Pinpoint Test H.B1218: 00Transmitter Identification Code: No Sub Type InformationGO to Pinpoint Test H.B121A: 11Keypad Illumination Output: Circuit Short to GroundGO to Pinpoint Test G.B121B: 01Keypad Input Switch: General Electrical FailureGO to Pinpoint Test F.B126A: 01Drivers Door Interior Lock Switch: General Electrical FailureGO to Pinpoint Test E.B130D: 00Memory Full for Integrated Key Programming: No Sub Type InformationThe maximum amount of IKTs (4) have been programmed into the BCM . Obtain all the customer's IKTs . Erase all the IKTs and program a maximum of 4.All other DTCs-REFER to the Diagnostic Trouble Code (DTC) Chart in Section 419-10.

You would need to see if any DTC'S -diagnostic trouble code's are stored in the BCM , That's the first thing that should be done . An a special type scan tool is needed , not a code reader for engine code's. If no code's ,checking power an ground circuits to the BCM need's to be done. Input an output test's have to be done as well . You need wiring diagrams , pin out diagram of BCM connectors . Need to know what all the BCM controls etc... Suggest you watch this videos . ECM Inputs and Outputs Diagnosis

Do you Body Control Module ? It's below left side of instrument panel . What type of problem are you having ? You can not change a BCM for another one
Important:

• Read the BCM set-up procedures carefully and completely.

• The BCM will not function properly if the Setup New BCM Procedure is not performed.

• Perform the Theft Deterrent Re-Learn procedure after successfully finishing the Setup New BCM Procedure. If the Theft Deterrent Re-Learn procedure is not performed after a BCM replacement, the following conditions may occur:

- The vehicle will not be protected against theft by the PASS-Key® II system.

- The engine will not start !!!!!!