Body Control System Circuit Description. Chevrolet Camaro 1998

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1998 🢒 Camaro 🢒 Body and Accessories 🢒 Body Control System 🢒 Body Control System Circuit Description

Circuit Operation

The following functions are controlled by the Body Control Module (BCM):

•	Remote Keyless Entry

Refer to Keyless Entry System Circuit Description .

•	Universal theft deterrent

Refer to Content Theft Deterrent (CTD) Circuit Description .

•	PASS-Key® II

Refer to Content Theft Deterrent (CTD) Circuit Description .

•	Audible warnings

Refer to Audible Warnings Circuit Description .

•	Fasten seatbelt indicator

Refer to Audible Warnings Circuit Description .

•	Low coolant indicator latching

Refer to Instrument Cluster Circuit Description .

•	Retained accessory power (RAP)

Refer to Retained Accessory Power (RAP) Circuit Description .

•	Door locks

Refer to Power Door Locks Circuit Description .

•	Rear compartment lid release

•	Courtesy lamp control

Refer to Interior Lights Circuit Description .

•	Illuminated entry

•	Delayed interior lamps

This section is intended to provide the technician with an understanding of BCM operation. The systems listed above are not described in detail in this section. For a better understanding of these systems, refer to the circuit description in that section.

Wake-up and Sleep Modes

Wake-up signals are signals which turn on the BCM. Once active, the BCM begins monitoring and controlling the system functions listed above. With the ignition switch in the OFF position the BCM ceases control of the system functions after a 10 minute period. This is the sleep mode. During the sleep mode the BCM monitors several circuits for changes in status. The BCM wakes up when a change is detected in any of the following inputs:

•	Courtesy lamps

•	Remote keyless entry

•	Ignition switch

•	Park lamps

•

Headlamps

•	Front side door locks or door jamb switches

•	Rear compartment lid ajar indication switch

•	Ignition key lock cylinder

•	Shock sensor

Power Requirements

The BCM will operate properly with a system voltage of 9-16 volts.

Operating current measured at the BCM battery terminals in the awake mode should not exceed the following values:

•	75 milliamps with the ignition switch in the OFF position

•	250 milliamps with the ignition switch in the RUN position

Operating current measured at the BCM battery terminals in the sleep mode should not exceed the following values:

•	Two milliamps on vehicles without theft deterrent (UA6)

•	Three milliamps on vehicles with theft deterrent (UA6)

Operating current measured at the BCM IGN1 and IGN3 terminals should not exceed 15 milliamps.

Abbreviations

The following abbreviations are used throughout this section:

•	Body control module (BCM)

•	Data link connector (DLC)

•	Diagnostic trouble code (DTC)

•	Digital Multimeter (DMM)

•	Instrument Cluster (IPC)

•	Powertrain control module (PCM)

•	Personal automotive security system (PASS-Key® II)

•	Retained accessory (RAP)

•	Universal theft deterrent (UTD)

BCM Replacement

Technicians should not replace the BCM unless directed to do so by the diagnostic procedures in this section. Most system faults are traceable to faulty wiring, connectors or components. The BCM is very reliable and is not likely the cause of the fault. Do not replace the BCM before performing a complete diagnosis. This may result in the replacement of a good BCM and a recurrence of the fault.

Important:

•	If the BCM is replaced refer to theft deterrent system to program the new BCM to the current ignition key.

•

A new BCM is shipped from the supplier in the factory test mode. This mode allows only limited functionality the BCM controlled systems. When a new BCM is installed it is necessary to exit the factory test mode prior to returning the vehicle to the customer. To restore the BCM to normal operation, turn the ignition switch from the RUN position to the OFF position 10 times or enter the program mode as described in theft deterrent systems.