SYMBOLDESCRIPTION1Forward Lamp Harness2Vehicle Control Module (VCM) (Gas Only)3Auxiliary Battery4Positive Auxiliary Battery Lead5Electronic Brake Control Module (EBCM)6Brake Pressure Warning Switch7Engine Harness8Underhood Fuse-Relay Center9Brake Lamp Relay10MaxiFuses11Diode 112Starter Relay13A/C Compressor Clutch Relay14Horn Relay15Fuel Pump Relay Chevy Tahoe 1999 Electrical Circuit Symbol Map