FORSCAN ? for 2025

[Cordycord]

The double-click sound on the turn signal is expected with 726-43-01 — that byte enables the amber turn/DRL share but the BCM still sends two electrical pulses for the hyperflash compensation, so you hear it even when the light cadence looks right visually. Not a problem.

For the intermittent behavior: the most likely cause is the auto-light threshold. The BCM only activates DRLs when ambient light is above its daytime threshold. If you tested this morning in a garage, under a carport, or even with heavy cloud cover, the sensor may have kept the DRL circuit dormant. Try this: park outside in full daylight, engine running, headlight switch in Auto, wait 10-15 seconds. Should come on.

If it's still inconsistent after that, check whether you saved the write with the engine running vs just key-on. Some BCM blocks on the 2025 need the alternator active (engine running) to fully commit the write — key-on only can look like it saved but revert on next cold start.

Surprise, it worked this morning. Also of note is that I have a light windshield tint, because SoCal. This does seem to be sensor-related.

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[fordwrench91]

Surprise, it worked this morning. Also of note is that I have a light windshield tint, because SoCal. This does seem to be sensor-related.

The tint sensor connection makes total sense. The windshield tint is absorbing just enough light to push the ambient sensor into twilight range under certain conditions, so the BCM holds off on DRLs until light level clears the threshold. If it ever becomes an issue, there is a byte in FORScan under the BCM module for auto-headlight sensitivity that you can adjust to trigger DRLs in a wider range of lighting conditions. Worth knowing it exists if morning marine layer becomes a recurring problem.

Surprise, it worked this morning. Also of note is that I have a light windshield tint, because SoCal. This does seem to be sensor-related.