Drivers Side Mirror Problem [Archive] - The Chrysler Minivan Fan Club Forums

: Drivers Side Mirror Problem



2ez24get
01-28-2010, 02:51 PM
I have had this problem since I purchased the T&C Limited last year. The memory settings for the drivers side mirror never seems to return to the correct memory settings when i switch between memory 1 and 2 positions. I have to manually change the mirror position. Anyone have experience with this problem. All other memory settings work including the passengers side mirror.

Thanks

Chrysler1924
01-28-2010, 03:06 PM
I have the same exact problem on my 2000 Limited. Everything else works fine except for the mirror. I am the only driver/operator of my Town & Country so I adjusted everything they way I wanted it and unplugged the battery overnight. This completely reset the memory module so as long as I never tried to program setting one or two, the mirror wouldn't move out of place whenever I unlocked the van with my key fob.

2ez24get
01-28-2010, 06:38 PM
Glad to hear that I am not the only one. I have already taken the DS mirror apart and found nothing wrong. Body Control Module controls the memory settings so this is where I am going to begin. I will check with my local Chrysler dealer to see if there is a TSB on this.

andyg
01-28-2010, 06:46 PM
Wouldn't there have to be some sort of sensor int he mirror so the computer would know how much to adjust it depending on where the last user left it? Maybe some type or resistor that the computer monitors one for the up and down and one for left/right?

If there are sensors, maybe they are bad?

atoman
01-28-2010, 07:02 PM
I suspect that all 4th gen memory systems are similar or identical..
It has to be either faulty potentiometers (variable resistors), wiring/connector problem, or the module itself.. (somewhat unlikely if only the mirror is not functioning)
here's what it says in 05 SM:


MEMORY SEAT/MIRROR
MODULE
DESCRIPTION
Vehicles equipped with the memory seat/mirror
option, utilize a memory module located under the
drivers front seat. This module is basically wired in-
line between the power seat switch and the power
seat track/adjuster motors, or in-line between the
power mirror switch and the power side view mir-
ror(s) motor(s). The Memory Seat/Mirror Module
(MSMM) contains a central processing unit that com-
municates with other modules on the Programmable
Communications Interface (PCI) data bus network.
The MSMM receives hard wired inputs from the
driver power seat switch and the potentiometers on
each of the driver side power seat track motors, or
from the power mirror switch and the potentiometers
on the side view mirror. The MSMM receives mes-
sages over the PCI data bus from the Body Control
Module (BCM) (memory switch status), the Power-
train Control Module (PCM) (vehicle speed status).
The MSMM will prevent the seat memory recall
function from being initiated if the driver side seat
belt is buckled, if the transmission gear selector lever
is not in the Park or Neutral positions, or if the vehi-
cle is moving.
For diagnosis of the MSMM or the PCI data bus, a
DRB IIIt scan tool and the proper Diagnostic Proce-
dures Information are recommended. The MSMM
cannot be repaired and, if faulty or damaged, it must
be replaced.
OPERATION
When memory system operation is requested
(depressing of the memory switch), a resistor multi-
plexed signal is sent from the memory switch to the
Body Control Module (BCM). The BCM will then
send the appropriate signals out to the Memory Seat/
Mirror Module (MSMM), the MSMM then applies the
voltage supply to the power seat track or side-view
mirror if the proper requirements are met. The vehi-
cle speed must equal zero and the transmission must
be in park or neutral in order for the memory system
to function.
DIAGNOSIS AND TESTING
MEMORY SEAT/MIRROR MODULE
Any diagnosis of the Memory Seat/Mirror sys-
tem should begin with the use of the DRB IIIt
diagnostic tool. For information on the use of
the DRB IIIt, refer to the appropriate Diagnos-
tic Procedures information.
Inspect the related wiring harness connectors for
broken, bent, pushed out, or corroded terminals.
Refer to the appropriate wiring information.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the driver side front bucket seat
retaining nuts from under the vehicle (Refer to 23 -
BODY/SEATS/SEAT - REMOVAL).
(3) Lift the drivers seat up and out of the mount-
ing holes in the floor pan and lay the seat rearward
to access the module located under the seat.
(4) Disconnect the memory seat/mirror module
electrical connectors. Depress the retaining tab and
pull straight apart.
(5) Remove the module retaining bolts and remove
the module from the bracket.
INSTALLATION
(1) Position and install the module retaining bolts.
(2) Connect the memory seat/mirror module elec-
trical connectors.
(3) Position the drivers seat in the mounting holes
in the floor pan.
(4) Install the driver side front bucket seat retain-
ing nuts from under the vehicle (Refer to 23 - BODY/
SEATS/SEAT - INSTALLATION).
(5) Connect the battery negative cable.

2ez24get
01-28-2010, 07:33 PM
So to replace the BCM it requires programming which means a trip to the dealership $$$. I guess I will wait until the BCM has other failures.:mad:

3.14.2 MEMORY MIRROR
The driver sideview mirror contains vertical and
horizontal bi-directional drive positioning motors
and position sensors. The MSMAPM provides a
5-volt reference on the signal circuit to each position
sensor. The sensors share a common ground circuit.
The MSMAPM monitors the position of the mirror
motors by measuring the voltage on each signal
circuit. When a memory position is set, the MSMAPM
monitors and stores the position of the
outside mirror. The MSMAPM adjusts the mirror to
the appropriate positions when a memory recall
message is received from the RKE or is requested
from the memory set switch.
The power mirror switch during non-memory
operation operates the mirror independently of the
MSMAPM.

atoman
01-28-2010, 07:48 PM
unfortunately, there seems to be no info on what the resistance range is supposed to be.. (it could easily be checked on the mirror or module connector..)

MSMM is a separate (from BCM) module located under driver's seat..

2ez24get
01-28-2010, 07:55 PM
unfortunately, there seems to be no info on what the resistance range is supposed to be.. (it could easily be checked on the mirror or module connector..)

MSMM is a separate (from BCM) module located under driver's seat..


So is the MSMM replaceable or does it have to be reprogrammed. I have found a few people reported they had to get their 2005 BCM flash upgraded after some power door lock problems.

I will see if the local Autozone has a code reader which includes BCM.

atoman
01-28-2010, 07:59 PM
as per above posted remove/install instructions, MSMM does not need any programming (flashing via DRB) and neither does BCM (for MSMM replacement..)

also, door locks have nothing to do with MSMM... (they are entirely controlled by BCM..)

atoman
01-28-2010, 10:39 PM
on second thought, how sure are you that the (drivers) mirror you have on the van is a "memory" mirror? (not sure if an auto-dim units were made without memory, but I'd look for a part# on the mirror and double check...)

2ez24get
01-29-2010, 06:47 AM
on second thought, how sure are you that the (drivers) mirror you have on the van is a "memory" mirror? (not sure if an auto-dim units were made without memory, but I'd look for a part# on the mirror and double check...)

The T&C is a Limited. I have taken the mirror apart and verified it has auto dim and heat. The mirror works manually just will not recall the memory mirror settings. New it runs about $300 and the aftermarket does not sell the mirror with auto dim, heated and memory together. The dealership is the only place to buy a replacement mirror with all three options.

sideburns2009
01-29-2010, 07:00 AM
My '97 does the same thing. The mirrors NEVER returned to the same position. EVER. I made the mistake of programming my key fob to go to Memory 1 when I press unlock so my mirrors always moved to the wrong position. I ended up unplugging the Memory Module under the drivers seat.

atoman
01-29-2010, 12:35 PM
The T&C is a Limited. I have taken the mirror apart and verified it has auto dim and heat. The mirror works manually just will not recall the memory mirror settings. New it runs about $300 and the aftermarket does not sell the mirror with auto dim, heated and memory together. The dealership is the only place to buy a replacement mirror with all three options.

I'm not questioning the fact that your van is supposed to come with a memory mirror... just saying that maybe the previous owner (or a repair shop) replaced the mirror for some reason...

in the parts catalog it lists:
W/auto dim Left
04-05 $329.00 $238.37
Heated w/memory Left
04-05 $327.00 $237.16

I'm not sure if there are auto dim units without memory or memory units without auto dim... (but this seems to suggest there are some variations)

In other words, maybe the mirror you have on there lacks the sending units for memory features...

atoman
01-29-2010, 10:42 PM
you can also look up the wiring diagram and test the potentiometers (memory sending resistors) at the MSMM connector... (you can compare right and left side mirrors, though there's no guarantee they have same resistance range by design..)

2ez24get
01-31-2010, 03:17 PM
I am hoping that someone who had this problem and fixed it would post their answer to this problem. Maybe a TSB from one of the years to shed some light on the problem and fix.

mrfixit454
02-01-2010, 03:14 PM
I don't think Chrysler did a good job with the mirror memory in general. Our 04 Pacifica could not hold the right positions either. Nor does our 05 T&C.
Sometimes it returns to the correct spot, sometimes it does not... both cars.

For the most part on the T&C, the seats go to the correct spot. Once and a while the recline parts does not reset so I hit the button again and it then goes to the correct spot.

First thing the dealer did for both cars is replace the mirrors, then the memory module. Did not fix the problem. We just live with it now.