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Day time running lights

woody367

By woody367
in Ask A GM Technician

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woody367 New Member

woody367

Posted
Posted

I have a 99 yukon "old body" my daytime running lights stopped working. The indicator on the dash is lit, the parking brake is off and all fuses are good. What could it be and what to check? Any help would be great. Thanks

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

First, check the DRL fuse in the left side of the dash fuse block. If that's okay, it could be the DRL relay, the DRL module or the DRL diode.

woody367 New Member

woody367

Posted
  • Author
Posted

I checked the fuse and thats good. What should I check nest? How do I test them and where are they located? I know where the diode is under the dash just right of the gas pedal it looks like a heatsink metal right? Can I just remove that diode and put a juper in there to test? I don't know where the relay is. I looked in the fuse box under the hood and where is the module. Thanks

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

Yes, that sounds like the diode. Dunno if you can just jump it. Never tried that. The relay is in the "convenience" center, which is agains the firewall, to the left of the steering column. The module is under the drivers side of the dash.

 

Here's the diagnosis for inop DRL's. Where there are two "Go to step ..." listed below each test, you go to the first one if the answer is yes, or the second one if the answer is no. Sorry for the lousy formatting which will make this very difficult to follow, but that's the best I can do with a cut and paste. I ain't about to try to type all that out myself to make it pretty.

 

 

1

Did you perform the DRL System Check?

--

Go to Step 2

Go to Daytime Running Lights (DRL) System Check

 

2

Ensure that the park brake is not engaged.

Turn the ignition switch to the RUN position.

Does the brake indicator lamp light?

--

Go to Step 12

Go to Step 3

 

3

Turn the ignition switch to the LOCK position.

Disconnect the daytime running lamps (DRL) module connector.

Turn the ignition switch to the RUN position.

Connect a J 34142-B test lamp from the DRL module connector, cavity C, to ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 13

 

4

Connect a J 34142-B test lamp from cavity C to cavity H of the DRL module connector.

 

Does the test lamp light?

--

Go to Step 5

Go to Step 14

 

5

Remove the DRL relay from the convenience center.

Connect a J 34142-B test lamp the DRL relay, cavity G6, to ground.

Does the test lamp light?

--

Go to Step 6

Go to Step 15

 

6

Connect a J 34142-B test lamp from the DRL relay, cavity G4, to ground.

 

Does the test lamp light?

--

Go to Step 7

Go to Step 16

 

7

Turn the ignition switch to the LOCK position.

Reconnect the DRL module connector.

Turn the ignition switch to the RUN position.

Does the DRL indicator lamp light?

--

Go to Step 8

Go to Step 17

 

8

Connect a J 39200 DMM from the DRL relay, cavity H6, to B+.

Measure the voltage.

Is there batery voltage?

Battery Voltage

Go to Step 9

Go to Step 18

 

9

Connect a fused jumper from cavity G6 to cavity H4 of the DRL relay.

 

Do the low beam headlights light?

--

Go to Step 19

Go to Step 10

 

10

Re-install the DRL relay.

Turn the ignition switch to the RUN position.

Disconnect the headlamp connector.

Connect a J 34142-B test lamp from cavity C (base) or cavity A (quad) to ground.

Does the test lamp light?

--

Go to Step 11

Go to Step 20

 

11

Connect a J 39200 DMM, set on ohms, between cavity A and ground.

 

Is there continuity?

--

Go to Step 21

Go to Step 22

 

12

Refer to Park Brake for diagnosis.

 

Did you find and correct the condition?

--

Go to Daytime Running Lights (DRL) System Check

--

 

13

Repair the open in CKT 39 (PNK) between the instrument panel (IP) fuse block and the DRL module.

 

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

 

14

Repair the open in CKT 150 (BLK) between the DRL module and ground G200.

 

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

 

15

Inspect for an open in CKT 340 (ORN) between the IP fuse block and D203.

If an open is not found, inspect for an open in CKT 634 (YEL) between D203 and the convenience center.

If an open is not found, locate and replace diode D203.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

 

16

Repair the open in CKT 39 (PNK) between splice S213 and the convenience center.

 

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

 

17

Inspect for a poor connection or damaged terminals at the DRL module connector.

Repair the DRL module connector, as necessary.

If you do not find a condition at the connector, replace the DRL module.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

 

18

Repair the open in CKT 592 (LT GRN/BLK) between the DRL module and the convenience center.

 

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

 

19

Replace the DRL relay. Refer to Daytime Running Lamps (DRL) Relay Replacement

 

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

 

20

Repair the open in CKT 12 (TAN) between the DRL relay and left high/low beam headlamps.

 

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

 

21

Replace the left and/or the right high/low beam headlamp. Refer to Headlamp Replacement

 

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

 

22

Repair the open in CKT 150 between the left high/low beam headlamp and ground G113, and/or repair the open in CKT 250 (BLK) between the right high/low beam headlamp and ground G112.

 

Is the repair complete?

woody367 New Member

woody367

Posted
  • Author
Posted

Thanks for the info. I will try what I can this weekend. I am guessing thatafter each question answer 1 is no and 2 is yess? please correct me id I am wrong.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

As I already said... where there are two "Go to step ..." listed below each test, you go to the first one if the answer is yes, or the second one if the answer is no.

 

I tried to figure out an easy way to post the actual, formatted page, but had no luck unless I was willing to cut and paste a whole bunch of screen captures together, which I wasn't.

 

I wish the forum software was better. Some allow directly pasting in images and things like that but not this one.

woody367 New Member

woody367

Posted
  • Author
Posted

Thanks for the help I realy appricate it. I am having some trouble locating the relay and module. I look at the fuse box under the hood and none for DRL on the fire wall under the dash is the flasher and some other small metal relay or something. Would that be it? and as far as the module goes there is somuch stuff under th dash with the alarm that was put in I don't know what I am looking at. I went and looked at a Chiltom and Hayes manual to see if they showed it but no luck. Local people told me to look but they keep telling me to look for the system that is on the newer body style with the DRL in the markers. This is a 99 that looks like the 98 stle with the DRL as part of the headlights. Let me know of a manual or something that might show me what to look for. Once again tha you for all the help.

Bob

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

The DRL module is a small box taped to the harness under the left side of the dash. The relay is in the box that's against the firewall, just about where your left foot would rest while driving.

  • 4 years later...
rshelton New Member

rshelton

Posted
Posted
This is what I've been looking for.
Will these steps work for a 2003 Silverado Z71?
Thanks for the help
rshelton


[quote name='GM-Tech' post='422277' date='Nov 16 2006, 03:23 PM']Yes, that sounds like the diode. Dunno if you can just jump it. Never tried that. The relay is in the "convenience" center, which is agains the firewall, to the left of the steering column. The module is under the drivers side of the dash.

Here's the diagnosis for inop DRL's. Where there are two "Go to step ..." listed below each test, you go to the first one if the answer is yes, or the second one if the answer is no. Sorry for the lousy formatting which will make this very difficult to follow, but that's the best I can do with a cut and paste. I ain't about to try to type all that out myself to make it pretty.


1
Did you perform the DRL System Check?
--
Go to Step 2
Go to Daytime Running Lights (DRL) System Check

2
Ensure that the park brake is not engaged.
Turn the ignition switch to the RUN position.
Does the brake indicator lamp light?
--
Go to Step 12
Go to Step 3

3
Turn the ignition switch to the LOCK position.
Disconnect the daytime running lamps (DRL) module connector.
Turn the ignition switch to the RUN position.
Connect a J 34142-B test lamp from the DRL module connector, cavity C, to ground.
Does the test lamp light?
--
Go to Step 4
Go to Step 13

4
Connect a J 34142-B test lamp from cavity C to cavity H of the DRL module connector.

Does the test lamp light?
--
Go to Step 5
Go to Step 14

5
Remove the DRL relay from the convenience center.
Connect a J 34142-B test lamp the DRL relay, cavity G6, to ground.
Does the test lamp light?
--
Go to Step 6
Go to Step 15

6
Connect a J 34142-B test lamp from the DRL relay, cavity G4, to ground.

Does the test lamp light?
--
Go to Step 7
Go to Step 16

7
Turn the ignition switch to the LOCK position.
Reconnect the DRL module connector.
Turn the ignition switch to the RUN position.
Does the DRL indicator lamp light?
--
Go to Step 8
Go to Step 17

8
Connect a J 39200 DMM from the DRL relay, cavity H6, to B+.
Measure the voltage.
Is there batery voltage?
Battery Voltage
Go to Step 9
Go to Step 18

9
Connect a fused jumper from cavity G6 to cavity H4 of the DRL relay.

Do the low beam headlights light?
--
Go to Step 19
Go to Step 10

10
Re-install the DRL relay.
Turn the ignition switch to the RUN position.
Disconnect the headlamp connector.
Connect a J 34142-B test lamp from cavity C (base) or cavity A (quad) to ground.
Does the test lamp light?
--
Go to Step 11
Go to Step 20

11
Connect a J 39200 DMM, set on ohms, between cavity A and ground.

Is there continuity?
--
Go to Step 21
Go to Step 22

12
Refer to Park Brake for diagnosis.

Did you find and correct the condition?
--
Go to Daytime Running Lights (DRL) System Check
--

13
Repair the open in CKT 39 (PNK) between the instrument panel (IP) fuse block and the DRL module.

Is the repair complete?
--
Go to Daytime Running Lights (DRL) System Check
--

14
Repair the open in CKT 150 (BLK) between the DRL module and ground G200.

Is the repair complete?
--
Go to Daytime Running Lights (DRL) System Check
--

15
Inspect for an open in CKT 340 (ORN) between the IP fuse block and D203.
If an open is not found, inspect for an open in CKT 634 (YEL) between D203 and the convenience center.
If an open is not found, locate and replace diode D203.
Is the repair complete?
--
Go to Daytime Running Lights (DRL) System Check
--

16
Repair the open in CKT 39 (PNK) between splice S213 and the convenience center.

Is the repair complete?
--
Go to Daytime Running Lights (DRL) System Check
--

17
Inspect for a poor connection or damaged terminals at the DRL module connector.
Repair the DRL module connector, as necessary.
If you do not find a condition at the connector, replace the DRL module.
Is the repair complete?
--
Go to Daytime Running Lights (DRL) System Check
--

18
Repair the open in CKT 592 (LT GRN/BLK) between the DRL module and the convenience center.

Is the repair complete?
--
Go to Daytime Running Lights (DRL) System Check
--

19
Replace the DRL relay. Refer to Daytime Running Lamps (DRL) Relay Replacement

Is the repair complete?
--
Go to Daytime Running Lights (DRL) System Check
--

20
Repair the open in CKT 12 (TAN) between the DRL relay and left high/low beam headlamps.

Is the repair complete?
--
Go to Daytime Running Lights (DRL) System Check
--

21
Replace the left and/or the right high/low beam headlamp. Refer to Headlamp Replacement

Is the repair complete?
--
Go to Daytime Running Lights (DRL) System Check
--

22
Repair the open in CKT 150 between the left high/low beam headlamp and ground G113, and/or repair the open in CKT 250 (BLK) between the right high/low beam headlamp and ground G112.

Is the repair complete?[/quote]

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