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1998 chevy cavalier where is the BCM (body control module) located?

Car wont start suspect the factory theft system. theft system light burns solid car cranks but doesnt start fuel pump pressure is good we have spark ignition test is good there is no fuel injector pulse .. suspect bcm if i can find it to be tested thank you , kim

Posted by KIMBERLEY FAIRBANKS on

  • Keith Widener
    Keith Widener Feb 23, 2018

    It(BCM) is integrated into the instrument cluster. The theft system shuts down the cars fuel system/fuel injectors. KEY 'on' position for 10 mins. It will reset things.

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1 Answer

Jeff Armer

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  • Cars & Trucks Master
  • 15,575 Answers

You have no idea what your messing with . Theft light on , DTC'S - diagnostic trouble codes stored . Before you start replacing BCM an making matters worse ,do yourself a favor an take it to a qualified repair shop .
The powertrain control module (PCM) communicates with the instrument cluster using serial data over the UART serial data bus, CKT 800. When the instrument cluster determines a Pass Theft condition, the instrument cluster sends a coded password to the PCM. When the instrument cluster receives the correct password, the PCM enables the fuel injection system in order to allow the vehicle to operate normally. The PCM may allow the vehicle to start and stall quickly during a failed theft condition.

The Passlock™ lock cylinder is a locking cylinder that turns a rotating magnet past a stationary hall effect sensor. The rotating magnet creates a resistance code (R-Code) that the cylinder sends to the instrument cluster. The Passlock™ lock cylinder interfaces with the instrument cluster through a 3 wire connection. The 3 wires have the following functions:
• Power
• Ground
• Data
The THEFT SYSTEM indicator will not light under any circumstances.
Replace the instrument cluster.
For Chevrolet vehicles, refer to Instrument Cluster Replacement .
For Pontiac vehicles, refer to Instrument Cluster Replacement .
Multiple indicators light continuously.
Test for a loss of serial data. Refer to Data Link Communications System Check .
Instrument cluster DTC B1021 sets.
The DTC indicates a loss of powertrain control module (PCM) serial data. Refer to Data Link Communications System Check .
Instrument cluster DTC B1022 sets.
The DTC indicates a loss of SIR serial data. Refer to Data Link Communications System Check .
Instrument cluster DTC B1023 sets.
The DTC indicates a loss of ABS serial data. Refer to Data Link Communications System Check .
Instrument cluster DTC B1011 sets.
Refer to DTC B1011 Passlock Cyl Data Shorted This Ign Cycle in Instrument Panel, Gauges and Console.
Instrument cluster DTC B1012 sets.
Refer to DTC B1012 Passlock Bad R-code This Ignition Cycle in Instrument Panel, Gauges and Console.
Instrument cluster DTC B1013 sets.
Refer to DTC B1013 Passlock Bad Timing This Ignition Cycle in Instrument Panel, Gauges and Console.
Instrument cluster DTC B1014 sets.
Refer to DTC B1014 Passlock R-code Unprogrammed in Instrument Panel, Gauges and Console.
Instrument cluster DTC B1015 sets.
Refer to DTC B1015 Passlock Cluster Fail Enabled in Instrument Panel, Gauges and Console.
Instrument cluster DTC B1017 sets.
Refer to DTC B1017 Passlock R-code Learn Failed in Instrument Panel, Gauges and Console.
The indicator flashes and no instrument cluster codes are set.
Refer to DTC B1013 Passlock Bad Timing This Ignition Cycle in Instrument Panel, Gauges and Console.
So , do yourself a favor an have a qualified repair shop check it out .

Posted on Feb 23, 2018

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5 Related Answers

Anonymous

  • 18 Answers

SOURCE: DISABLING SERVICE RIDE CONTROL via REPROGRAMMED BCM

bottom of sterring colum under under trim panel

Posted on Jul 19, 2009

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Anonymous

  • 74 Answers

SOURCE: Body Control Module

Below the instrument panel on the left side henge pillar,or up high behind the Instrument panel depending the model and options!

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Posted on Mar 09, 2010

ftw1952

frank thomas wilson

  • 10319 Answers

SOURCE: 2001 honda civic ex,wont start, no injector pulse,

Injector pulses are sent from the engines computer. Have that checked out

Posted on Apr 07, 2010

lintner randy

  • 288 Answers

SOURCE: i have 97 blazer with 4.3.had a deadshort to 5v

just a thought pull a coulpe of spark plugs see if there flooded also if you can scan the veh look at tps voltage now and look for cranking rpms should be around 240 rpms

Posted on May 30, 2010

sulgrave55

Jerry Ross

  • 1066 Answers

SOURCE: ok i have a 88 chev k 1500 doesnt pulse the

Sounds like the idle air control valve on the side of the TBI is bad. The IAC only works during idle so if you rev up the engine it should stay running if the IAC is bad. Make sure all of your vacuum lines are good going to the TBI.

Posted on May 05, 2015

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