The headlights will work without the DRL
Module plugged in. The DRL
supplies pulsed voltage to the high beams when the truck is running.
headlight circuit is separate from the normal hi/lo circuit feeding the headlights. However, the high beam indicator light and the parking brake switch circuits also go through the DRL
plug (module). The jumpers are installed to restore those functions.
Using ETVM pages 97-1, 97-2 and 60-6 (for diesel)
At the DRL
Pin 1 GY/W High Beam Indicator light
Pin 2 Not Used
Pin 3 P/O Power Hot in Run
Pin 4 LG/R Parking Brake Switch
Pin 5 P/W Brake Warning Indicator
Pin 6 R/BK Low Beam Headlights
Pin 7 BK/O Power Hot at All Times
Pin 8 High Beam Headlights
Jumper wire 12 LG/BK pin 8 to wire 932 GY/W pin 1 for High Beam Indicator Light in dash.
Jumper wire 977 P/W pin 5 to wire 162 LG/R pin 4 for Parking Brake Switch.