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