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This may not be of much use because the yes/no questions won't paste, but I attempted to enter the yes/no answers. Hopefully you can get a little bit of use from this. When you come upon untrue step let me know which step and I'll try to help.

Document ID# 759020
2002 Cadillac Seville


Air Delivery Improper

Test Description

The number below refers to the step number on the diagnostic table.

11.The HVAC control module (IPM) sends a voltage signal to the mode actuator in order to control mode door movement. This signal should be low (near 0 V) when the mode actuator is commanded towards defrost position and high (near 5 V) when the mode actuator is commanded towards the vent position.










Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

DEFINITION: Air does not flow correctly from the air distribution outlets.


1

Did you perform the HVAC Diagnostic System Check?

--

Go to Step 2 =yes

Go to Diagnostic System Check - HVAC Systems - Automatic =no


2
•Turn ON the ignition, with the engine OFF.
•Turn OFF the HVAC controls.

Is the blower motor OFF?

--

Go to Step 3=yes

Go to Blower Motor Always On =no


3

Place the blower motor switch in each speed position.

Does the blower motor operate at all?

--

Go to Step 4 =yes

Go to Blower Motor Inoperative =no


4

Does the blower motor operate in each speed position?



Go to Step 5 =yes

Go to Blower Motor Malfunction =no


5

Place the recirculation switch in the recirculation and outside air positions.

Does the recirculation actuator move from the recirculation position to the outside air position?

--

Go to Step 6 =yes

Go to Air Recirculation Malfunction =no


6

Place the mode switch in each position.

Is the air flow sufficient from the correct outlets in each mode?

--

Go to Testing for Intermittent and Poor Connections in Wiring Systems =yes

Go to Step 7 =no


7
•Turn OFF the ignition.
•Disconnect the mode actuator.
•Turn ON the ignition, with the engine OFF.
•Probe the ignition 3 voltage circuit of the mode actuator with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

--

Go to Step 8 =yes

Go to Step 17 =no


8

Measure the voltage from the 5-volt reference circuit of the mode actuator to a good ground.

Does the voltage measure near the specified value?

5 Volts (value)

Go to Step 9 =yes

Go to Step 13 =no


9

Test the mode door control circuit of the mode actuator for an open, short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20 =yes

Go to Step 10 =no


10

Test the mode door signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20 =yes

Go to Step 11 =no


11
•Turn OFF the ignition.
•Connect the mode actuator.
•Connect the IPM.
•Turn ON the ignition, with the engine OFF.
•Measure the voltage from the mode door control circuit of the mode actuator to a good ground.
•With a scan tool, command the mode actuator to DEFROST and to A/C.

Does the voltage measure near the specified value for each commanded state?

0.1 Volts DEFROST (value)

4.95 Volts Air conditioning (value)

Go to Step 14 =yes

Go to Step 12 =no


12
•With a scan tool, observe the Htr./Def./A/C Dr Actual parameter in the Instrument Panel Module data list.
•Connect a 3-amp fused jumper wire between the mode door control circuit and the 5-volt reference circuit of the mode actuator. (Drives the actuator toward the vent position.)
•Record the maximum value of the Htr./Def./A/C Dr Actual parameter.
•Remove the fused jumper wire. Connect the 3-amp fused jumper wire between the mode door control circuit of the mode actuator and a good ground. (Drives the actuator toward the defrost position.)
•Record the minimum value of the Htr./Def./A/C Dr Actual parameter.
•Subtract the minimum recorded value from the maximum recorded value.

Does the result of your calculation indicate that the door travel range is greater than the specified value?

200 Counts (value)

Go to Step 16 =yes

Go to Step 14 =no


13

Test the 5-volt reference circuit of the mode actuator for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20 =yes

Go to Step 16 =no


14

Inspect the mode door and the mode actuator for the following conditions:
•A misaligned mode actuator-- Refer to Mode Actuator Replacement .
•Broken or binding linkages or mode door
•An obstruction that prevents the mode actuator from operating within it's full range of motion
•Missing seals to the mode door
•Misaligned seals to the mode door

Did you find and correct the condition?

--

Go to Step 20 =yes

Go to Step 15 =no


15

Inspect for poor connections at the harness connector of the mode actuator. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20 =yes

Go to Step 18 =no


16

Inspect for poor connections at the harness connector of the IPM. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20 =yes

Go to Step 19 =no


17

Repair the ignition 3 voltage circuit of the mode actuator. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 20 =yes

--
There isn't a no

18



Important

Perform the recalibration procedure for the mode actuator.


Replace the mode actuator. Refer to Mode Actuator Replacement .

Did you complete the replacement?

--

Go to Step 20 =yes

There isn't a no


19



Important

Perform the recalibration procedure for the IPM.


Replace the IPM. Refer to HVAC Control Module Replacement .

Did you complete the replacement?

--

Go to Step 20 =yes

There isn't a no


20

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK =yes

Go to Step 2 =no
 

·
Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
·
19,278 Posts
Can anyone tell me how to solve problems with a/c not blowing through front vents?
=========================
yes - I can help -
but this belongs in the Seville forum - here -
http://www.cadillacforums.com/forums/cadillac-seville-cadillac-eldorado-forum/

see you there -

------


----------

This may not be of much use because the yes/no questions won't paste, but I attempted to enter the yes/no answers. Hopefully you can get a little bit of use from this. When you come upon untrue step let me know which step and I'll try to help.

Document ID# 759020
2002 Cadillac Seville


Air Delivery Improper

Test Description

The number below refers to the step number on the diagnostic table.

11.The HVAC control module (IPM) sends a voltage signal to the mode actuator in order to control mode door movement. This signal should be low (near 0 V) when the mode actuator is commanded towards defrost position and high (near 5 V) when the mode actuator is commanded towards the vent position.










Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

DEFINITION: Air does not flow correctly from the air distribution outlets.


1

Did you perform the HVAC Diagnostic System Check?

--

Go to Step 2 =yes

Go to Diagnostic System Check - HVAC Systems - Automatic =no


2
•Turn ON the ignition, with the engine OFF.
•Turn OFF the HVAC controls.

Is the blower motor OFF?

--

Go to Step 3=yes

Go to Blower Motor Always On =no


3

Place the blower motor switch in each speed position.

Does the blower motor operate at all?

--

Go to Step 4 =yes

Go to Blower Motor Inoperative =no


4

Does the blower motor operate in each speed position?



Go to Step 5 =yes

Go to Blower Motor Malfunction =no


5

Place the recirculation switch in the recirculation and outside air positions.

Does the recirculation actuator move from the recirculation position to the outside air position?

--

Go to Step 6 =yes

Go to Air Recirculation Malfunction =no


6

Place the mode switch in each position.

Is the air flow sufficient from the correct outlets in each mode?

--

Go to Testing for Intermittent and Poor Connections in Wiring Systems =yes

Go to Step 7 =no


7
•Turn OFF the ignition.
•Disconnect the mode actuator.
•Turn ON the ignition, with the engine OFF.
•Probe the ignition 3 voltage circuit of the mode actuator with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

--

Go to Step 8 =yes

Go to Step 17 =no


8

Measure the voltage from the 5-volt reference circuit of the mode actuator to a good ground.

Does the voltage measure near the specified value?

5 Volts (value)

Go to Step 9 =yes

Go to Step 13 =no


9

Test the mode door control circuit of the mode actuator for an open, short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20 =yes

Go to Step 10 =no


10

Test the mode door signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20 =yes

Go to Step 11 =no


11
•Turn OFF the ignition.
•Connect the mode actuator.
•Connect the IPM.
•Turn ON the ignition, with the engine OFF.
•Measure the voltage from the mode door control circuit of the mode actuator to a good ground.
•With a scan tool, command the mode actuator to DEFROST and to A/C.

Does the voltage measure near the specified value for each commanded state?

0.1 Volts DEFROST (value)

4.95 Volts Air conditioning (value)

Go to Step 14 =yes

Go to Step 12 =no


12
•With a scan tool, observe the Htr./Def./A/C Dr Actual parameter in the Instrument Panel Module data list.
•Connect a 3-amp fused jumper wire between the mode door control circuit and the 5-volt reference circuit of the mode actuator. (Drives the actuator toward the vent position.)
•Record the maximum value of the Htr./Def./A/C Dr Actual parameter.
•Remove the fused jumper wire. Connect the 3-amp fused jumper wire between the mode door control circuit of the mode actuator and a good ground. (Drives the actuator toward the defrost position.)
•Record the minimum value of the Htr./Def./A/C Dr Actual parameter.
•Subtract the minimum recorded value from the maximum recorded value.

Does the result of your calculation indicate that the door travel range is greater than the specified value?

200 Counts (value)

Go to Step 16 =yes

Go to Step 14 =no


13

Test the 5-volt reference circuit of the mode actuator for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20 =yes

Go to Step 16 =no


14

Inspect the mode door and the mode actuator for the following conditions:
•A misaligned mode actuator-- Refer to Mode Actuator Replacement .
•Broken or binding linkages or mode door
•An obstruction that prevents the mode actuator from operating within it's full range of motion
•Missing seals to the mode door
•Misaligned seals to the mode door

Did you find and correct the condition?

--

Go to Step 20 =yes

Go to Step 15 =no


15

Inspect for poor connections at the harness connector of the mode actuator. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20 =yes

Go to Step 18 =no


16

Inspect for poor connections at the harness connector of the IPM. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20 =yes

Go to Step 19 =no


17

Repair the ignition 3 voltage circuit of the mode actuator. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 20 =yes

--
There isn't a no

18



Important

Perform the recalibration procedure for the mode actuator.


Replace the mode actuator. Refer to Mode Actuator Replacement .

Did you complete the replacement?

--

Go to Step 20 =yes

There isn't a no


19



Important

Perform the recalibration procedure for the IPM.


Replace the IPM. Refer to HVAC Control Module Replacement .

Did you complete the replacement?

--

Go to Step 20 =yes

There isn't a no


20

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK =yes

Go to Step 2 =no
======================

WOW - that's painful -
 

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Registered
2002 STS
Joined
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18 Posts
Discussion Starter #5
In most cases what is it that needs to be replaced and where is it located?

----------

When I turn the car off then on and turn a/c on its in auto once I switch to front vents it works for a couple minutes then goes to blowing out dash. The other post was helpful but I don't have the equipment to check all the stuff discussed
 

·
Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
·
19,278 Posts
In most cases what is it that needs to be replaced and where is it located?

----------

When I turn the car off then on and turn a/c on its in auto once I switch to front vents it works for a couple minutes then goes to blowing out dash. The other post was helpful but I don't have the equipment to check all the stuff discussed
=======================
all the various actuators are monitored by the computer -
if they fail to respond properly - a code is set -

so - let's start by checking for Diagnostic Trouble Codes -
if you don't know how - go here and read the ENTIRE post -

http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/138257-how-pull-codes-dtcs.html

if you have any codes - post them here -
ALONG WITH THEIR DEFINITIONS -

====================

lets get the terminology correct -
so we are speaking the same language -

VENTS -
floor vents -
center or dash vents -
defroster vents -

MODE door changes WHERE the air blows from -

MIX doors are responsible for duct temperature -
#1 is driver side - #2 is passenger side -

RECIRCULATE door allows or restricts outside air into the cabin -

-------------------------
 
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