With the dual control HeaterTreater Jeep
Grand Cherokee blend door fix, the auxiliary motor has to be wired into
the system to replace the existing back actuator motor. The wires
are access from the back of the HVAC control module in the center
console. When you remove the HVAC control module, there are two
connectors that plug into the back of the box. Remove both
connectors and place the control module to the side. Looking into
the connector with the wires on the back side, the color code will look
like the figure below for the two connectors.
Connector 1
|
|
|
|
|
|
|
|
| Tn/Blk |
-- |
Gy/Blu |
Y/Blu |
-- |
Blk/Wt |
-- |
Blk |
| Grn/Y |
Blu/Rd |
-- |
-- |
-- |
Blk/Wt |
-- |
-- |
Connector 2
|
|
|
|
|
|
| -- |
Grn/Wt |
Blk/Wt |
Blu/Wt |
-- |
Org |
| Rd/Grn |
Y/Grn |
Grn |
- - |
Wt/Pk |
Pink |
For Left Hand Drive vehicles the Grn/Wt and Blu/Wt(marked in red) wires
are used for the new auxiliary motor. The wires have to be cut
and the new motor connected to these two wires on the connector side of
the cut. The two wires going to the back motor are now isolated.
The old motor has to be cut out and the new motor inserted in
order for the system to properly calibrate. The green wire from
the new motor connects to the Grn/Wt wire and the yellow wire connects
to the Blu/Wt wire.
For Right Hand Drive vehicles, the Blu/Rd and Blk/Wt(marked in blue)
are used for the auliliary motor. The wiring diagram is different
for the RHD vehicle and the connection is made with the green wire from
the motor to the Blu/Rd wire and the yellow wire to the Blk/Wt wire
marked above. Note that there are three Blk/Wt wires and you have
to get the correct one from connector 2.
The new motor has to be mounted "piggyback" on the existing motor.
If the motors are reversed, the system will not align properly.
The hole through the existing front motor has to be enlarged in
order for the axle to fit through the motor and drivers side door to
the back door as noted in the instructions.
Once the motors are connected and verified with the 9V battery to be
operating correctly, make all the wire connections and force the system
to go through a re-set cycle in order for the system to calibrate
itself properly. You can reset the system with the following
sequence of steps:
Blend Door Actuator Motor Calibration
1. Turn ingnition key to the on position and turn on the HVAC system.
2. Move the key to the off position.
3. Open hood(bonnet for the RHD guys) and locate fuse #15 in the fuse box next to the battery.
4. Remove the fuse and wait 1-2 minutes for any capacitive charges in the system to dissipate.
5. Replace the fuse.
6. Turn the ignition key to the on position. You can now
watch the motors move as the system goes through the calibration
routine. Leave the key on for a couple of minutes to make sure
that the calibration routine is completed before turning it off.
You will also be able to hear additional activity as all the
doors and fan speed are calibrated.
You may have to run the cal routine a couple of times to get the system
back to full functionality. If the position of the new door is
significantly different from the point at failure, the system will
successively move toward the new correct position setting. It may
take two or three cycles for the system to move to the correct position.