GMC T-Series 2007 - Page 284

Relay Block C Usage
1 Parking Brake
2
Daytime Running Lamps (DRL) On
(Engine Run)
3
Daytime Running Lamps (DRL) Off
(Parking)
4
Parking Lamps/Daytime Running
Lamps (DRL)
5 Fuel Filter (Heated Fuel)
6 Stop Lamp
Relay Block D Usage
1 Neutral (Medium Duty Transmission)
2
Back-up Lamp (Reverse)
(Medium Duty Transmission)
Relay Block C
Relay Block D
284