Headlamps, Daytime Running Lamps (DRL) On with Headlamp Switch On. GMC Truck GMC C-Series Medium Duty Truck B7 2000

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2000 🢒 GMC C-Series Medium Duty Truck B7 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Headlamps, Daytime Running Lamps (DRL) On with Headlamp Switch On

Step	Action	Value(s)	Yes	No
1	Remove the daytime running lights (DRL) control module. Set the headlamp switch to the HEAD position. Connect a test lamp between terminals D and H in the DRL control module harness connector. Did the test lamp light?	--	Go to Step 2	Go to Step 3
2	Replace the DRL control module. Refer to Daytime Running Lights (DRL) Control Module Replacement . Is the repair complete?	--	System OK	--
3	Locate and repair the open in CKT 10 (YEL) between terminal D in the headlamps dimmer switch and terminal D in the DRL control module. Is the repair complete?	--	System OK	--

Step

Action

Value(s)

Yes

Remove the daytime running lights (DRL) control module.
Set the headlamp switch to the HEAD position.
Connect a test lamp between terminals D and H in the DRL control module harness connector.

Did the test lamp light?

Go to Step 2

Go to Step 3

Replace the DRL control module. Refer to Daytime Running Lights (DRL) Control Module Replacement .

Is the repair complete?

System OK

Locate and repair the open in CKT 10 (YEL) between terminal D in the headlamps dimmer switch and terminal D in the DRL control module.

Is the repair complete?

System OK