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Home >> Chevrolet >> 2000 >> Venture Plus >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Modules >> Diagnostic Tests >> DTC 3: Courtesy Lights >> Circuit Description
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Circuit Description

Body Control Module (BCM) controls power supply for interior light illumination. BCM will turn on interior lights when any of the following actions occur: When any door is opened. Instrument panel dimmer switch is turned to DOME position. Exit illumination is activated. Doors are unlocked using Remote Keyless Entry (RKE) transmitter (on models with type 3 or 4 BCM). Doors are unlocked using door key cylinder (on models with type 4 BCM). BCM turns off interior lighting when all doors are closed or when interior lighting override switch is turned off. DTC 3 will be set when BCM senses a short to positive battery in interior light control circuit 690 (Gray/Black wire) between BCM and all courtesy lights. To change interior lighting settings, see INTERIOR LIGHTING MODES  under PROGRAMMING.

  1. Perform diagnostic system check of Body Control Module (BCM). See BODY CONTROL MODULE DIAGNOSTIC SYSTEM CHECK  under TROUBLE SHOOTING. Go to next step.
  2. Ensure all interior lights are off. Disconnect BCM connector terminal No. C1. Using a DVOM, measure voltage between ground and BCM connector terminal "F". Turn ignition switch to ON position. If battery voltage is present, go to next step. If battery voltage is not present, go to step  4 .
  3. Repair short to battery positive voltage in circuit 690 (Gray/Black wire) as necessary. Go to step  5 .
  4. Replace Body Control Module (BCM). See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. If vehicle is equipped with factory installed Central Theft Deterrent (CTD) anti-theft system, perform CTD relearn procedure. See CENTRAL THEFT DETERRENT (CTD) RELEARN  under PROGRAMMING. Program feature customization settings. See ENTER FEATURE CUSTOMIZATION MODE  under PROGRAMMING. After repair is complete, go to next step.
  5. Turn ignition switch to LOCK position. Restore all disconnected connectors and components. Open any vehicle door for 10 seconds. Close all vehicle doors. Remove BCM PRGRM (10-amp) fuse. Turn ignition switch to ACC position and count chime tones to identify BCM type. Within one second, cycle ignition switch from ACC position to LOCK position, then back to ACC position. Count chime tones for any BCM DTCs stored. If any BCM DTCs exist, go to appropriate procedure for BCM DTCs stored. If no chime tones are heard, no BCM DTCs are present and system is okay.
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