Q50s drl's not functioning - Infiniti Q50 Forum
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post #1 of 5 (permalink) Old 08-15-2019, 11:18 PM Thread Starter
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Default Q50s drl's not functioning

Hows it going everyone, so i recently purchased a 2015 q50s and ive just come to realize the DRL's Arent functioning, the headight works the turn signals work and the reflector light comes on, but the brow and the DRL dont. i changed the relay i checked the DRL fuses in both the fuse box in the engine bay as well as the IPDM and the fuses are fine, both headlights are having the same issue. any help would be greatly appreciated.

Attached is a diagram of the headlight. THE NON FUNCTIONAL PARTS ARE --- EYEBROW DRL / DRL
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post #2 of 5 (permalink) Old 08-16-2019, 10:36 AM
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Here are a couple of threads that have similar topics you may find helpful.

https://www.infinitiq50.org/forum/pr...ght-issue.html

https://www.infinitiq50.org/forum/q5...iver-side.html

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post #3 of 5 (permalink) Old 08-16-2019, 02:51 PM
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So if you've checked fuses #72 and #73 in the Fuse and Fusible Link Block and fuse #58 in the IPDM E/R and they are ok. You've replaced the Daytime Running Light Relay. That still leaves some things to be sorted out:

Check DRL relay power supply - Remove DRL relay and check the voltage between the DRL harness connector (E104) and ground. Terminals 2, 5, and 7 should show battery voltage when checked against ground. If not, repair or replace harness.

Check DRL circuit - With the DRLs energized, check the voltage between the IPDM E/R harness connector (E126) and ground. Terminal 85 should show 0-1 VDC when the DRLs are on and 9-16 VDC when off. If the voltage is fixed at 9-16 VDC regardless of the DRL being on, then you may be looking at replacing the IPDM E/R or the BCM.

If the voltage is fixed at 0-1 VDC, then the DRL relay control signal circuit needs to be checked by removing the DRL relay, disconnecting the IPDM E/R harness connector and checking the continuity between the IPDM E/R harness connector (E126/terminal 85) and the DRL relay connector (E104/terminal 1). If continuity exists, then the IPDM E/R needs to be replaced or if not, repair or replace the harness.

Check DRL ground circuit - Check the continuity between the front combination lamp harnesses and ground. Connector E42/terminal 4 for the RH front combination lamp and Connector E41/terminal 4 for the LH front combination lamp. If continuity exists, then it could be the front combination lamp. If continuity doesn't exist then the harness needs to be repaired or replaced.

I think you've done the obvious by checking the fuses and replacing the DRL relay but to do these other tests properly requires a CONSULT scan tool so you may want to consider having your Infiniti service department troubleshoot your DRL system, IMHO.

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post #4 of 5 (permalink) Old 08-16-2019, 04:47 PM Thread Starter
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You're a beast my dude, thanks. But yea the rest of the things you mentioned i should do are a bit out of my league so ill try and get it checked by a consult tool at the dealer. thanks for the input, always appreciated.
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post #5 of 5 (permalink) Old 08-16-2019, 07:37 PM
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Quote:
Originally Posted by ThatBlackQ50s View Post
You're a beast my dude, thanks. But yea the rest of the things you mentioned i should do are a bit out of my league so ill try and get it checked by a consult tool at the dealer. thanks for the input, always appreciated.
Not really a beast, but according to one person on this forum, I am like a know-it-all uncle that turns into a rabid animal if you disagree with me. Hmm, I guess that does make me a beast after all.

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