GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Equinox 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Daytime Running Lamps (DRL) Inoperative

Diagnostic Aids
    • Inspect the daytime running lamp (DRL) resistor located on the left frame rail for cracks and corrosion. Refer to Daytime Running Lamps (DRL) Resistor Replacement . A failure of the resistor due to corrosion brought on by the original fastening procedure to the frame has been common on this vehicle.
    • If replacing DRL resistor please pay attention to any replacement revisions.

Step

Action

Yes

No

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

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 3

Go to Diagnostic System Check - Vehicle

2

Recheck the scan tool for the following:

    • DTC B2600
    • DTC B2602
    • DTC B2603

Have any of the above DTCs set?

Go to Diagnostic Trouble Code (DTC) List - Vehicle

Go to Step 3

3
  1. Ensure that the ambient light sensor is not covered and is receiving daylight conditions.
  2. Place the headlamp switch in the AUTO position.
  3. Turn ON the ignition, with the engine OFF.
  4. Block the wheels.
  5. Ensure the parking brake is disengaged.
  6. Place the transaxle in neutral.

Do the daytime running lamps (DRL) illuminate?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 4

4
  1. Turn ON the ignition, with the engine OFF.
  2. With the scan tool, command the DRL ON.

Do the low beam headlamps illuminate at low intensity?

Go to Step 5

Go to Step 7

5

Test for high resistance or open in the following body control module (BCM) circuits. Refer to Circuit Testing and Wiring Repairs .

    • DRL/ambient light sensor signal
    • Low ref
    • Headlamp low beam signal - between the BCM and the I/P fuse block

Did you find and correct the condition?

Go to Step 10

Go to Step 6

6

Inspect for poor connections at the harness connector of the ambient light sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 8

7

Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the ambient light sensor. Refer to Ambient Light Sensor Replacement .

Did you complete the replacement?

Go to Step 10

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9

Replace the BCM. Refer to Control Module References for replacement, setup and programming.

Did you complete the replacement?

Go to Step 10

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10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2