Wiper problem
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Wiper problem
Wiper problem? Have already changed the multifunction switch and still the problem persist. When placed on the constant fast or super fast mode the wipers wipe. When put on the intermitten mode they might jump a few inches then stop. Lower the intermitten speed the less movement. At the slower speeds they wont move at all. And at no point will the wipers, when turned off go back to their stop position. Any clues
Lead Driver
Joined: Sep 2007
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From: Scio, OR
What year is the truck? On earlier trucks with a GEM module, the intermittent wiper function was part of the GEM module and the wiper motor was just a simple motor. On later trucks after the GEM module was eliminated, the intermittent logic functions were moved to the wiper motor module itself.
Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
You said the wipers don't return to their parked position when they are shut off. That is a function of a switch in the wiper motor, I believe. I do not know if the motor is serviceable. If it is, the parking switch might be repairable. Otherwise I'd say the entire motor probably has to be replaced.
Thinking further, though. The park function requires power at all times on pin 2 of the wiper motor connector. There is also a wiper run/park relay in the power distribution box. Actually, sitting here staring at the wiring diagram, the whole thing is way too complicated. I dunno what they were thinking.
I think I'd start with checking for power at pin 2 of the wiper motor connector, and then identify and replace the run/start relay. I can post up the wiring diagram if it'd help.
Thinking further, though. The park function requires power at all times on pin 2 of the wiper motor connector. There is also a wiper run/park relay in the power distribution box. Actually, sitting here staring at the wiring diagram, the whole thing is way too complicated. I dunno what they were thinking.
I think I'd start with checking for power at pin 2 of the wiper motor connector, and then identify and replace the run/start relay. I can post up the wiring diagram if it'd help.
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The wiring diagram would be awesome. I have checked the relay in the voltage box under the hood it's ok. Guess that only leaves the motor. A little of the subject but if anyone has a diagram for the associated high pressure oil sensors to see how they all work togather that would be equally awesome.
Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
Here is the wiring diagram for the wipers. I'm usually pretty good at figuring out electrical stuff, but that doesn't make a lick of sense to me.
I'm not sure what you're asking about the high pressure oil sensors. There is just one, the ICP (Injector Control Pressure) sensor. It is a 3 wire pressure sensor connected to the PCM. The PCM uses the ICP sensor to derive a pressure value, then controls the IPR (Injector Pressure Regulator) valve to determine Injector Control Pressure based on fueling demand. It's about that simple.
I'm not sure what you're asking about the high pressure oil sensors. There is just one, the ICP (Injector Control Pressure) sensor. It is a 3 wire pressure sensor connected to the PCM. The PCM uses the ICP sensor to derive a pressure value, then controls the IPR (Injector Pressure Regulator) valve to determine Injector Control Pressure based on fueling demand. It's about that simple.
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