If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Rear washer motor stuck on
Have any of you Chrysler techs ever seen a failure mode where the rear window washer comes on by itself and stays on? I traced mine back to the fact that pin 50 on the BCM connector is staying grounded all of the time. The part I don't know how to troubleshoot is the interaction with the climate control subsystem in the console. Is there any way to know if it has failed and is somehow commanding the BCM to run the rear washer? Or is it more likely that the BCM pin 50 driver has failed shorted to ground? One interesting thing is that when the motor first failed on, even shutting down the engine wouldn't stop it. I had to unplug the pump connector to kill it. I then had a local garage look at it and they couldn't find the problem, but said they thought the pump was bad as it didn't run when they plugged it back in (it had been several months since the failure). That was a couple of months ago and today it all of the sudden came on again. The difference is that this time when I shut off the engine, it would quit. I'm certain before it ran even with the engine off, which seems hard to believe looking at the way the system is wired (unless the ignition switch is also faulty and letting power through it in the off position). In addition, my front washer quit working recently. I haven't had time yet to work on that, but was reviewing the manual this evening. I'll check the washer motor itself first, but assuming that is OK, how hard is it to get to the multi-function switch connector to check the washer switch itself? The FSM diagram just shows it being on the steering column, but isn't really clear how to get at it. I assume this procedure is somewhere else in the manual, but I haven't yet found that section. Matt |
Ads |
#2
|
|||
|
|||
"Matt Whiting" > wrote in message ... > > Have any of you Chrysler techs ever seen a failure mode where the rear > window washer comes on by itself and stays on? I traced mine back to > the fact that pin 50 on the BCM connector is staying grounded all of the > time. The part I don't know how to troubleshoot is the interaction with > the climate control subsystem in the console. Is there any way to know > if it has failed and is somehow commanding the BCM to run the rear > washer? Or is it more likely that the BCM pin 50 driver has failed > shorted to ground? > > One interesting thing is that when the motor first failed on, even > shutting down the engine wouldn't stop it. I had to unplug the pump > connector to kill it. I then had a local garage look at it and they > couldn't find the problem, but said they thought the pump was bad as it > didn't run when they plugged it back in (it had been several months > since the failure). That was a couple of months ago and today it all of > the sudden came on again. The difference is that this time when I shut > off the engine, it would quit. I'm certain before it ran even with the > engine off, which seems hard to believe looking at the way the system is > wired (unless the ignition switch is also faulty and letting power > through it in the off position). > > In addition, my front washer quit working recently. I haven't had time > yet to work on that, but was reviewing the manual this evening. I'll > check the washer motor itself first, but assuming that is OK, how hard > is it to get to the multi-function switch connector to check the washer > switch itself? The FSM diagram just shows it being on the steering > column, but isn't really clear how to get at it. I assume this > procedure is somewhere else in the manual, but I haven't yet found that > section. > > > Matt Some of the older Caravans had this problem and the switch was at fault, but since we have no idea what we are working on I cant be much help to you. Glenn Beasley Chrysler Tech |
#3
|
|||
|
|||
|
#4
|
|||
|
|||
maxpower wrote:
> "Matt Whiting" > wrote in message > ... > >>Have any of you Chrysler techs ever seen a failure mode where the rear >>window washer comes on by itself and stays on? I traced mine back to >>the fact that pin 50 on the BCM connector is staying grounded all of the >>time. The part I don't know how to troubleshoot is the interaction with >>the climate control subsystem in the console. Is there any way to know >>if it has failed and is somehow commanding the BCM to run the rear >>washer? Or is it more likely that the BCM pin 50 driver has failed >>shorted to ground? >> >>One interesting thing is that when the motor first failed on, even >>shutting down the engine wouldn't stop it. I had to unplug the pump >>connector to kill it. I then had a local garage look at it and they >>couldn't find the problem, but said they thought the pump was bad as it >>didn't run when they plugged it back in (it had been several months >>since the failure). That was a couple of months ago and today it all of >>the sudden came on again. The difference is that this time when I shut >>off the engine, it would quit. I'm certain before it ran even with the >>engine off, which seems hard to believe looking at the way the system is >>wired (unless the ignition switch is also faulty and letting power >>through it in the off position). >> >>In addition, my front washer quit working recently. I haven't had time >>yet to work on that, but was reviewing the manual this evening. I'll >>check the washer motor itself first, but assuming that is OK, how hard >>is it to get to the multi-function switch connector to check the washer >>switch itself? The FSM diagram just shows it being on the steering >>column, but isn't really clear how to get at it. I assume this >>procedure is somewhere else in the manual, but I haven't yet found that >>section. >> >> >>Matt > > > Some of the older Caravans had this problem and the switch was at fault, but > since we have no idea what we are working on I cant be much help to you. Yes, my obvious oversight. 1996 Grand Voyager, 3.3L, 4 speed, more details just posted in another post. Matt |
#5
|
|||
|
|||
Matt Whiting wrote:
> > Have any of you Chrysler techs ever seen a failure mode where the rear > window washer comes on by itself and stays on? I traced mine back to > the fact that pin 50 on the BCM connector is staying grounded all of the > time. The part I don't know how to troubleshoot is the interaction with > the climate control subsystem in the console. Is there any way to know > if it has failed and is somehow commanding the BCM to run the rear > washer? Or is it more likely that the BCM pin 50 driver has failed > shorted to ground? > > One interesting thing is that when the motor first failed on, even > shutting down the engine wouldn't stop it. I had to unplug the pump > connector to kill it. I then had a local garage look at it and they > couldn't find the problem, but said they thought the pump was bad as it > didn't run when they plugged it back in (it had been several months > since the failure). That was a couple of months ago and today it all of > the sudden came on again. The difference is that this time when I shut > off the engine, it would quit. I'm certain before it ran even with the > engine off, which seems hard to believe looking at the way the system is > wired (unless the ignition switch is also faulty and letting power > through it in the off position). > > In addition, my front washer quit working recently. I haven't had time > yet to work on that, but was reviewing the manual this evening. I'll > check the washer motor itself first, but assuming that is OK, how hard > is it to get to the multi-function switch connector to check the washer > switch itself? The FSM diagram just shows it being on the steering > column, but isn't really clear how to get at it. I assume this > procedure is somewhere else in the manual, but I haven't yet found that > section. Ok, I mentioned earlier that the above applies to a 96 Grand Voyager. This weekend I checked the circuit diagrams carefully (page 8W-53-3 through -6) and verified that both washer motors function and the multifunction switch washer switch works fine. I'm fairly certain that the rear washer staying on is due to a failure in the BCM driver for pin 50, rear washer motor control. However, I can't be 100% sure as I'm not sure how to verify that the AC/heater control module is erroneously telling the BCM to run the rear washer. Is there a good way to check this? I'm less sure about the front washer not working. The diagrams on -3 and -4 suggest that the washer switch itself provides the ground path for the front motor via circuit V10 to the switch and then Z1 to G200. However, it appears to be paralleled to pin 19 on the BCM which is called the front washer motor control, thus analogous to the rear washer motor control. I assumed this was so that the BCM could sense the washer switch being closed and thus run the wipers for the "wipe after wash" feature. However, it seems in that case they would call it "front washer motor sense", rather than "control." Anyone know for sure how this works? I'm suspecting the BCM for the front washer as well, but the circuit diagram seems to indicate that it doesn't play a role in operating the front washer motor. Matt |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Rear window washer 99.5 Golf | Rob Guenther | VW water cooled | 2 | May 5th 05 11:04 PM |
Rear washer jet on Golf. | greallo | VW water cooled | 1 | February 9th 05 07:53 AM |
flat towing instructions | [email protected] | Jeep | 44 | February 7th 05 06:51 AM |
New *FREE* Corvette Discussion Forum | JLA ENTERPRISES TECHNOLOGIES INTEGRATION | Corvette | 12 | November 30th 04 06:36 PM |