GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Tahoe Z71 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Headlights Twilight Sentinel/Daytime Running Lights (DRL) Schematics
Figure 1:

DRL Module, DRL Relay, Headlamps
Object Number: 574592 Size: FS
Lighting Systems Components
Twilight Sentinel Circuit Description
Headlamp and Panel Dimmer Switch, Headlamp Control Module
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Headlamp and Panel Dimmer Switch, Headlamp Control Module
Brake Warning Lamp Control (all except 15000lb GVW)
Fog Lamp Switch, Relay and Lamps
G200 (1 of 4)
G113
Headlamp and Panel Dimmer Switch, Headlamp Control Module
SECURITY/STRG, PK LPS, and DRL-FOG Fuses
GAUGES Fuse
GAUGES Fuse
Fog Lamp Switch, Relay and Lamps
Headlamp and Panel Dimmer Switch, Headlamp Control Module
G112
Indicator Lamps
Indicator Lamps
Figure 2:

Headlamp and Panel Dimmer Switch, Headlamp Control Module
Object Number: 574594 Size: FS
Lighting Systems Components
Twilight Sentinel Circuit Description
DRL Module, DRL Relay, Headlamps
Handling Electrostatic Discharge Sensitive Parts Notice
DRL Module, DRL Relay, Headlamps
DRL Module, DRL Relay, Headlamps
LIGHTING and BATTERY Fuses
Fuses, Headlamp and Panel Dimmer Switch and Window Switches
SECURITY/STRG, PK LPS, and DRL-FOG Fuses
Heated Seat Switches and Body Control Module
G202 (2 of 4)
DRL Module, DRL Relay, Headlamps