Mondeo MK3, Front Wiper Motor / Fuse94 problem, any ideas?
Discussion
Hi, Thanks for looking at this post. I'm pulling my hair out with this one and i'm not sure if i am missing something simple... Any help would be greatly appreciated.
53 (Facelift) Ghia x 2.0tdci 130ps.
My Auto Lights and Wipers failed the other day (Thursday - very wet and windy), further trials showed all wiper and wash functions were not functioning. On inspection it was due to fuse F94 having blow. I replaced the fuse, and it blew the moment my ignition reached second switch position, so i started diagnostics:
Removed stalk, light switch and sensor from circuit. = Still blows fuses.
Removed Front Wiper motor from circuit, fuse does not blow. (so this suggests component failure of the front motor)
Changed the wiper motor. Fuse blows. Changed the wiper motor for a third one (just in case the replacement was faulty), still blows the fuse. (Thanks to the kind man at the breaker yard to let me just keep trying different units). 3 different motors can't be faulty, surely nobody's luck is that bad! lol
If i remove the fuse F94 and wire in a tester rig (blub) to the fuse box, and turn on the ignition without the motor attached, no load on circuit (no light).
If I add the wiper motor in and turn on, the bulb lights up very brightly (suggesting strong current and hence blowing the 20A fuse when fitted). So with the motor fitted to the circuit there is a current being drawn.
I have switched the front and rear wipe relays, to rule these out, makes no difference to the symptom.
Using a tester rig on the Wiper Motor wiring harness connector I have found that the intemitent wipe cable (Green & White) is receiving power when the ignition switch is at position two. In fact, so does Green & Red (from front wipe relay), and White Blue (Also from front wipe relay).
I have removed the earth cable from behind the OS headlamp, given a good clean and refitted (Haynes manual states E15, which is shared by RHS Headlamp and both tail lamps, when removed headlamps go dim - so I know this is the right earth)
I have also ran the diagnostic on the GEM, which doesn't chime for wipers (should chime when wipers are returned to 'park' - or stalk at wiper off position). However, i tested without a wiper motor attached (as this is the only way i can stop the fuse from blowing).
For good measure I have also stripped my wiper stalk to look for obvious breakage, and can see no real problem. To be fair, it is a reasonably robust system inside the stalk and I guess that they rarely fail because of it's design?
This is where i have started to pull my hair out, and i don't have that much going spare, so this is not good!
Does this mean that the GEM is faulty, or should i be focusing on the connector for the wiper motor? Also, if the intermittent wipe is receiving power (which is the same wire for slow wipe and single wipe functions on the stalk, just using GEM and relay) is this normal as the wiper motor will always try to return to 'Park' when the ignition is turned on - so power to motor must be normal?
I know that the washer motor is also on the same system, but without the front motor fitted I can use the rear wash and wipe and also the front wash, so it would suggest that there is no fault. In desparation I fitted a 30A fuse to see what was happening, the front wiper was working away happily for about 3 or 4 passes before parking when ignition was put to switch position 2. This repeated the second time i tried. Third time the fuse blew and i decided not to push my luck with the over sized fuse any more!
Any help would be very greatly received, and sorry about the huge post, but there is a lot of investigation to explain....
Thanks in advance,
Scott.
53 (Facelift) Ghia x 2.0tdci 130ps.
My Auto Lights and Wipers failed the other day (Thursday - very wet and windy), further trials showed all wiper and wash functions were not functioning. On inspection it was due to fuse F94 having blow. I replaced the fuse, and it blew the moment my ignition reached second switch position, so i started diagnostics:
Removed stalk, light switch and sensor from circuit. = Still blows fuses.
Removed Front Wiper motor from circuit, fuse does not blow. (so this suggests component failure of the front motor)
Changed the wiper motor. Fuse blows. Changed the wiper motor for a third one (just in case the replacement was faulty), still blows the fuse. (Thanks to the kind man at the breaker yard to let me just keep trying different units). 3 different motors can't be faulty, surely nobody's luck is that bad! lol
If i remove the fuse F94 and wire in a tester rig (blub) to the fuse box, and turn on the ignition without the motor attached, no load on circuit (no light).
If I add the wiper motor in and turn on, the bulb lights up very brightly (suggesting strong current and hence blowing the 20A fuse when fitted). So with the motor fitted to the circuit there is a current being drawn.
I have switched the front and rear wipe relays, to rule these out, makes no difference to the symptom.
Using a tester rig on the Wiper Motor wiring harness connector I have found that the intemitent wipe cable (Green & White) is receiving power when the ignition switch is at position two. In fact, so does Green & Red (from front wipe relay), and White Blue (Also from front wipe relay).
I have removed the earth cable from behind the OS headlamp, given a good clean and refitted (Haynes manual states E15, which is shared by RHS Headlamp and both tail lamps, when removed headlamps go dim - so I know this is the right earth)
I have also ran the diagnostic on the GEM, which doesn't chime for wipers (should chime when wipers are returned to 'park' - or stalk at wiper off position). However, i tested without a wiper motor attached (as this is the only way i can stop the fuse from blowing).
For good measure I have also stripped my wiper stalk to look for obvious breakage, and can see no real problem. To be fair, it is a reasonably robust system inside the stalk and I guess that they rarely fail because of it's design?
This is where i have started to pull my hair out, and i don't have that much going spare, so this is not good!
Does this mean that the GEM is faulty, or should i be focusing on the connector for the wiper motor? Also, if the intermittent wipe is receiving power (which is the same wire for slow wipe and single wipe functions on the stalk, just using GEM and relay) is this normal as the wiper motor will always try to return to 'Park' when the ignition is turned on - so power to motor must be normal?
I know that the washer motor is also on the same system, but without the front motor fitted I can use the rear wash and wipe and also the front wash, so it would suggest that there is no fault. In desparation I fitted a 30A fuse to see what was happening, the front wiper was working away happily for about 3 or 4 passes before parking when ignition was put to switch position 2. This repeated the second time i tried. Third time the fuse blew and i decided not to push my luck with the over sized fuse any more!
Any help would be very greatly received, and sorry about the huge post, but there is a lot of investigation to explain....
Thanks in advance,
Scott.
Hi bud, mine turned out to be the wiper motor and the gem unit. I swapped the wiper motor but fuses were still blowing. When I changed both, the problem was fixed. Hasn't skipped a beat since.
Take out your gem unit, search eBay for a second hand one (cus they aint cheap from ford), and get a wiper motor from a breaker. Easy to do yourself, should cost about £60. Google how to reprogram your key fob and one touch windows, anti hijack etc and you should be ok.
Take out your gem unit, search eBay for a second hand one (cus they aint cheap from ford), and get a wiper motor from a breaker. Easy to do yourself, should cost about £60. Google how to reprogram your key fob and one touch windows, anti hijack etc and you should be ok.
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