I have a 2002 Seinna that the rear A/C and heater fan works only on the "high" setting. Doesn't make any difference if controled from the front control knob or the rear. Any help?
phil
I have a 2003 sienna.
I have a alldata subscription.
Do you have the "manual" heat/AC or "Automatic" Heat/AC?
From looking at the electrical diagram for the "manual" version.......there seems to be 2 different fan speed resistor assemblies for the REAR blowers.
There is a blower, with its own resistor for the A/C through the ceiling vents.
There is ANOTHER blower, with its own resistor for the HEAT, with the vents under the front seats in the Manual version.
So......try to see if the problem is in the ceiling vents or the vents under the front seats.
For the A/C.....the resistor is in the back.....you have to remove the back (row 3) seat, passenger side.
Remove the inside rear trim panel to get to the rear cooling unit.
If you have the "automatic" version......you have a "power transistor" instead of a resistor.
For manual version.....the resistor will have a 4 wire plug.......with the resistor held in with 2 screws.
Looking at the plug on the resistor unit......with the "clip" at the top,
Pin 1 is top right
Pin 2 is top left
Pin 3 is bottom right
Pin 4 is bottom left
Pins 1-3 about 1.68 ohms
Pins 2-3 about 0.86 ohms
Pins 2-4 about 0.22 ohms
Not sure if I got the connector here or not.
I went out and undid and pried the rear passenger side trim panel open to peak inside to try to get a picture to help you out.
The blower resistor for the rear HEAT is located UNDER the front PASSENGER seat.
Remove the trim panel that has the heat vent under the passenger seat.
The rear heater blower resistor is the 4 wire plug that is located on the rear facing side of the unit......easy to get to, once the trim panel is removed.
Pin orientation relative to the tab (at top of plug) is the same as for the A/C above.
Pins 1-3 about 2.14 ohms
Pins 2-3 about 1.0 ohms
Pins 2-4 about 0.46 ohms
Rear heater blower motor resistor connector ....this was easier to get a picture for you.....under the passenger side front seat......
I am guessing that you will have either a OPEN or a SHORT.
Measure the resistance of your meter leads......1 lead to another........subtract that value from what you measure at the resistor pins to get the actual value.
I have a alldata subscription.
Do you have the "manual" heat/AC or "Automatic" Heat/AC?
From looking at the electrical diagram for the "manual" version.......there seems to be 2 different fan speed resistor assemblies for the REAR blowers.
There is a blower, with its own resistor for the A/C through the ceiling vents.
There is ANOTHER blower, with its own resistor for the HEAT, with the vents under the front seats in the Manual version.
So......try to see if the problem is in the ceiling vents or the vents under the front seats.
For the A/C.....the resistor is in the back.....you have to remove the back (row 3) seat, passenger side.
Remove the inside rear trim panel to get to the rear cooling unit.
If you have the "automatic" version......you have a "power transistor" instead of a resistor.
For manual version.....the resistor will have a 4 wire plug.......with the resistor held in with 2 screws.
Looking at the plug on the resistor unit......with the "clip" at the top,
Pin 1 is top right
Pin 2 is top left
Pin 3 is bottom right
Pin 4 is bottom left
Pins 1-3 about 1.68 ohms
Pins 2-3 about 0.86 ohms
Pins 2-4 about 0.22 ohms
Not sure if I got the connector here or not.
I went out and undid and pried the rear passenger side trim panel open to peak inside to try to get a picture to help you out.
The blower resistor for the rear HEAT is located UNDER the front PASSENGER seat.
Remove the trim panel that has the heat vent under the passenger seat.
The rear heater blower resistor is the 4 wire plug that is located on the rear facing side of the unit......easy to get to, once the trim panel is removed.
Pin orientation relative to the tab (at top of plug) is the same as for the A/C above.
Pins 1-3 about 2.14 ohms
Pins 2-3 about 1.0 ohms
Pins 2-4 about 0.46 ohms
Rear heater blower motor resistor connector ....this was easier to get a picture for you.....under the passenger side front seat......
I am guessing that you will have either a OPEN or a SHORT.
Measure the resistance of your meter leads......1 lead to another........subtract that value from what you measure at the resistor pins to get the actual value.
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