Daytime Running Lamps (DRL) Inoperative. GMC Truck Sonoma Pickup

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2001 🢒 Sonoma Pickup - 2WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Daytime Running Lamps (DRL) Inoperative

Daytime Running Lamps (DRL) Inoperative Standard

Step

Action

Yes

Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

Verify that the DRL headlamps are inoperative.

Do the DRL headlamps operate normally?

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

Go to Step 3

Use the scan tool to inspect for the following related Body Control Module (BCM) Data/ Input Parameters and Output Controls. Refer to Scan Tool Data List for typical values and definitions:

•	Headlamp Ambient Light Sensor

•	Park Brake Switch

•	Auto Headlamps

•	Headlamp Relay Feedback

•	Daytime Running Lamps Relay

•	Headlamp Power Relay

•	Left Turn Signal

•	Right Turn Signal

•	High Beam Switch

•	Flash to Pass Switch

Did you find and correct a condition?

Go to Step 10

Go to Step 4

Turn the headlamp switch to the HEAD position.

Do the headlamps operate properly in the LO position?

Go to Step 5

Go to Headlamps Inoperative - Low Beams

Place the multifuncton headlamp dimmer switch in the HI position.

Do the headlamps operate properly in the HI position?

Go to Step 6

Go to Headlamps Inoperative - High Beams

Place the fog lamp switch in the ON position.

Do the fog lamps operate properly?

Go to Step 7

Go to Fog Lamps Inoperative

With the key in RUN, engine off, and the Headlamp Switch in the AUTO position, remove the DRL relay from the underhood fuse block.
Use a J 39200 digital multimeter (DMM) to check for continuity to ground from the DRL relay control circuit terminal at the DRL relay connector in the underhood fuse block. Refer to Circuit Testing in Wiring Systems.

Is continuity present?

Go to Step 9

Go to Step 8

Repair the open or high resistance in the DRL relay control circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 10

Replace the DRL relay.

Did you complete the repair?

Go to Step 10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

Daytime Running Lamps (DRL) Inoperative Envoy/Diamond Edition w/HID

Step

Action

Yes

Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

Verify that the DRL headlamps are inoperative.

Do the DRL headlamps operate normally?

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

Go to Step 3

Use the scan tool to inspect for the following related Body Control Module (BCM) Data/ Input Parameters and Output Controls. Refer to Scan Tool Data List for typical values and definitions:

•	Headlamp Ambient Light Sensor

•	Park Brake Switch

•	Auto Headlamps

•	Headlamp Relay Feedback

•	Daytime Running Lamps Relay

•	Headlamp Power Relay

•	High Beam Switch

•	Flash to Pass Switch

Did you find and correct a condition?

Go to Step 11

Go to Step 4

Turn the headlamp switch to the HEAD position.

Do the High beam headlamps operate properly?

Go to Step 5

Go to Headlamps Inoperative - High Beams

Inspect the IGN E fuse in the underhood fuse block.

Is the fuse open?

Go to Step 6

Go to Step 7

Remove the DRL relay from the underhood fuse block.

Use a J 39200 digital multimeter (DMM) to check for continuity to ground at the igniton 1 voltage circuit terminal of the DRL relay connector in the underhood fuse block. Refer to Circuit Testing in Wiring Systems.

Is continuity present?

Go to Step 9

Go to Step 10

With the key in RUN, engine off, and the Headlamp Switch in the AUTO position, check for continuity to ground at the DRL relay control circuit terminal at the DRL relay connector in the underhood fuse block. Refer to Circuit Testing in Wiring Systems.

Is continuity present?

Go to Step 10

Go to Step 8

Repair open in the DRL relay control circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 11

Repair the short to ground in the igniton 1 voltage circuit or the associated components. Refer to Wiring Repairs in Wiring Systems and Power Distribution Schematics in Wiring Systems for more information.

Did you complete the repair?

Go to Step 11

Replace the DRL relay.

Did you complete the repair?

Go to Step 11

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

Daytime Running Lamps (DRL) Inoperative ZR2

Step

Action

Value(s)

Yes

Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

Verify that the DRL headlamps are inoperative.

Do the DRL headlamps operate normally?

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

Go to Step 3

Use the scan tool to inspect for the following related Body Control Module (BCM) Data/ Input parameters and Output controls. Refer to Scan Tool Data List for typical values and definitions:

•	Headlamp Ambient Light Sensor

•	Park Brake Switch

•	Auto Headlamps

•	Headlamp Relay Feedback

•	Daytime Running Lamps Relay

•	Headlamp Power Relay

•	High Beam Switch

•	Flash to Pass Switch

Did you find and correct a condition?

Go to Step 13

Go to Step 4

Turn the headlamp switch to the HEAD position.

Do the low beam headlamps operate properly?

Go to Step 5

Go to Headlamps Inoperative - Low Beams

With the key in RUN and engine off, remove the DRL relay (ZR2).
Use a J 39200 digital multimeter (DMM) to check for voltage at the DRL relay coil battery positive voltage supply terminal of the DRL relay connector. Refer to Circuit Testing in Wiring Systems.

Is the specified voltage present?

B+

Go to Step 7

Go to Step 6

Test for an open, high resistance or short to ground in the Ignition 1 voltage circuit. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

Go to Step 9

Go to Step 12

With the headlamp switch in the AUTO position, use the J 39200 DMM to check for continuity to ground at the DRL relay coil control circuit terminal at the DRL relay connector. Refer to Circuit Testing in Wiring Systems.

Is continuity present?

Go to Step 8

Go to Step 10

Reinstall the DRL (ZR2) relay.
With the headlamp switch in the HEAD position and the multifunction headlamp dimmer switch in LO beam, use the J 39200 DMM to backprobe for continuity to ground from the DRL relay headlamp dimmer switch low beam signal circuit terminal at the DRL relay connector. Refer to Circuit Testing in Wiring Systems.

Is continuity present?

Go to Step 12

Go to Step 11

Repair the open, high resistance or short to ground in the ignition 1 voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

Repair the open or high resistance in the DRL relay control circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

Repair the open or high resistance in the headlamp dimmer switch low beam signal circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13