Been working on my '94 vert and getting it back on the road, but lately I've been getting a number of annoying electrical issues. I'm pretty well stumped at this point.
Symptoms - Wipers and washer stopped functioning out of the blue. All fuses are fine, all relays operate normally when supplied with 12V. I wanted to check the Wiper Amp according to page EL-63 of the FSM
, but the instructions show a diagram for a 7-pin module, while my green box only has 5 pins. So I didn't mess with that.
Next I tried troubleshooting the Time Control Unit in the footwell according to EL-53. I did the Power Supply Check to start, and everything measured fine for pins 2-15 and 9-15, but measuring across 5-15 shows a very small voltage reading for each Off, Acc, and On. According to the FSM it should read 0, 0, and 12V respectively. FSM just says to "Check harness for TCU power supply circuit", but I really don't know where to go from there.
On Page EL-54 I also did Steps A and B. Measuring across pins 1-15 with the Wiper set to INT should show a swing from 0 to 12V every 3 to 12 seconds, but my multimeter just reads a constant 12V. Step B measured fine.
I have not yet tried putting 12V directly into the wiper or washer motors. Wasn't sure if that would work since there's an Amplifier module.
Is the TCU the problem maybe? Something else entirely? I have no idea if it is related, but my warning chimes also seem to have quit. No longer chimes with the key in the ignition and door open, or with lights on and door open. Finally, the Seat Belt warning light does not come on when unbuckled, even though the seat is plugged in and I've verified the switch is working in the buckle.