SureTrack Real Fix: Daytime Running Lights

Real Fixes from ShopKey’s SureTrack® expert information resource are documented issues from actual shop repair orders and community discussions. Read on to see how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is currently available free with the purchase of a current Snap-on® diagnostic software version or in our ShopKey Pro product.

Many vehicles have daytime running lights and most people never think twice about them. But if you notice that they aren’t working, you can head to your local mechanic for help. Follow this Real Fix to see how inoperative daytime running lights on this Chevrolet Equinox were diagnosed and repaired.

2006 Chevrolet Equinox LS 3.4L

B2600, B2602, Replaced Daytime Running Lights Resistor

The customer states the daytime running lights are inoperative.

Connected a scan tool and found codes: B2600 – Daytime Running Lights Control Circuit and B2602 – DRL Relay Control Circuit Shorted To Ground. Turned the low beam headlamps on and found they operated properly. Disconnected the daytime running lights relay, used a multi-meter to measure the resistane between ground and the daytime running lights resistor voltage supply circuit at the relay connector and found the measured resistance was not within the specified range of 0.4-1.0 ohm. Inspected the daytime running lights resistor connector and terminals and found no faults. Used the multi-meter to check for the presence of a short or open in the daytime running lights resistor voltage supply and ground circuits and found there were no shorts or opens present. These test results verified the daytime running lights resistor was faulty.

Replaced the daytime running lights resistor, cleared codes, performed a road test and verified the vehicle operated properly.

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About the Author

Nick Taylor

Nick Taylor is the SureTrack Community Administrator and a Senior Applications Specialist at Mitchell 1 with over 25 years of experience with electronic repair data systems. Nick previously worked in the automotive dismantling and engine rebuilding industries.