GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Savana 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Headlamps, Daytime Running Lamps (DRL) On with Headlamp Switch On

Headlamps, Daytime Running Lamps (DRL) On with Headlamp Switch On for GMC Truck Savana 2000

Headlamps, Daytime Running Lamps (DRL) On with Headlamp Switch On Domestic

Step

Action

Value(s)

Yes

No

1

Review the daytime running lamp (DRL) operation and perform the necessary inspections.

Did you complete the system review and inspection?

--

Go to Step 2

Go to Symptoms

2

Attempt to operate the DRL with the headlamps on.

Does the system operate with the headlamps on?

--

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3
  1. Remove the DRL relay.
  2. Disconnect the DRL control module.
  3. Test for a short to ground in CKT 592 (LT GRN/BLK) which connects the DRL control module to the DRL relay coil.
  4. If a short to ground was located, repair it.

Did you locate and repair a short to ground?

--

Go to Step 5

Go to Step 4

4

Replace the daytime running lamp control module.

Is the repair complete?

--

Go to Step 5

--

5

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3

Headlamps, Daytime Running Lamps (DRL) On with Headlamp Switch On Export

Step

Action

Value(s)

Yes

No

1

Review the daytime running lamp (DRL) operation and perform the necessary inspections.

Did you complete the system review and inspection?

--

Go to Step 2

Go to Symptoms

2

Attempt to operate the DRL with the headlamps on.

Does the system operate with the headlamps on?

--

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3
  1. Remove the DRL relay.
  2. Disconnect the DRL control module.
  3. Test for a short to ground in CKT 592 (LT GRN/BLK) which connects the DRL control module to the DRL relay coil.
  4. If a short to ground was located, repair it.

Did you locate and repair a short to ground?

--

Go to Step 7

Go to Step 4

4
  1. Disconnect the DRL control module.
  2. Turn on the parklamps.
  3. Measure the voltage at cavity D of the DRL control module connector.

Was the measurement equal to battery voltage?

B+

Go to Step 6

Go to Step 5

5

Repair the open CKT 9 (BRN) between the DRL control module and splice S225.

Did you complete the repair?

--

Go to Step 7

--

6

Replace the daytime running lamp control module.

Did you complete the repair?

--

Go to Step 7

--

7

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3