No low beam headlights, High beam okay

[Allen Heath]

I'm new to this forum and have been unsuccessful searching for previous topics on my problem.  My current new problem is no low bean headlights, but clearance and high beams work.  I pulled out a headlight bulb, jumpered juice straight to the pins, and both filaments work.  I'm getting lost looking in the FRB for anything obvious (no brown wires or connectors indicating a burning problem), or even places to test for proper voltages. The labels on the board that I think has something to do with the headlights seem confusing in that when I move the steering stalk for High or Low beams green LED indicator lights D5 and D2 (D5: LI HI BEAM RELAY OK, D2: R HI BEAM RELAY OKAY) aren't making sense to me.  Both say for the High Beam Relay but when D5 is on D2 is off, and when D5 is off D2 is on ... but they both say High Beam???.  What connector on that board would have the output LOW beam voltage?   Low beams were working as I recently came home in the rain and they came on with the wipers as they always used to.  After I parked at home a few days later I was taking the coach to storage about dusk and noticed no more low beams.  Coach is '07 Patriot Thunder.  I'm trying to attach pictures of the board's LED indicators.

[Scott Shearer]

Allen,

See if this post sheds any light on your headlight issue.
https://beaveramb.org/forum/index.php/topic,11089.msg76330.html#msg76330

The pcb#8 label is wrong (not the only one). It wasn't corrected until model year 2009.

Attached are images of the updated PCB #8 labels and the pin out for PCB #8 headlight connector J1.

-Scott

[Scott Shearer]

Allen,

Looking at our 2006 PT, I just discovered that not only is the label for PCB#8 printed wrong (HI vs LOW BEAM), but it is 180 degrees off. This makes diagnosing very confusing. The corrected label is also 180 degrees off, the letters ‘F8’ need to go to the bottom.

LEDs per schematic
D4: RED – HI BEAM RELAY OK
D5: GREEN - HI BEAM CRKTBRKR OK
D1: RED – LOW BEAM CKTBRKR OK
D2: GREEN – LOW BEAM RELAY OK
D3 YELLOW – LOW BEAM SIGNAL OK
Looking at the images that you posted, it appears that the first image is correct for high beam (D4) on, low beam (D2) off, the second image would be correct for low beam (D2) on, high beam (D4) off.

I would next use a DVOM to take readings at the J1 terminal block on PCB#8. I posted the pin outs for J1.

Then, depending on your results, follow the suggestions in the above-mentioned thread. You could also report back your results.

-Scott