A/C condition problem and others to my a 2000 DTS

[wajeh83]

Hi there,

I have a Cadillac DTS 2000 I bought it last month and the A/C condition great but when I drove the car by 110 Kilometer it start to blow hot air every 3 mints and then it switch to cold !!!!

Am thinking the cause might be the vacuumed air pipes as the main break does not released automatically when I put the gear on Drive mood!!!!

If this is the problem of the A/C how can I fix it and could you illustrate with pic. Please how to open and fix it from inside and outside????

Also, I found that I can’t set the air from inside where it is now take the air from outside while the smokes of the cars come inside, as well as the mood I can’t change it from the front air blow to the foot option or defrost mood!!!!

I pull the codes it might cause these problems which are as the following:

ABS • C1287 - Steering Sensor Rate Malfunction - His

IPC -- Instrument Panel Cluster

• U1016 - Loss of Communications with PCM

IPM -- Instrument Panel Integration Module

• B0429 - Temperature Control #3 Rear Circuit Range/Performance - Current

• B0248 - Mode Door Inoperative Error - Current

• B0269 - Air Inlet Door Range Error - Current

• B0408 - Temperature Control #1 (Main/Front) Circuit Malfunction - Current

IRC -- Integrated Radio Chassis

• U1016 - Loss of Class 2 Communication with VCM - His

RSS -- Road Sensing Suspension

• C0620 - Right Front Position Sensor Malfunction - His

• C0615 - Left Front Position Sensor Malfunction - His

I hope the best to all of you

Warm regards

[BodybyFisher]

These four codes appear to be your problem, they are all CURRENT

• B0429 - Temperature Control #3 Rear Circuit Range/Performance - Current

• B0248 - Mode Door Inoperative Error - Current

• B0269 - Air Inlet Door Range Error - Current

• B0408 - Temperature Control #1 (Main/Front) Circuit Malfunction - Current

The question is whether or not these codes are caused by the network (U)...

Check the connections at your left and right front position sensors to see if the wires are disconnected or corroded

Maybe someone will chime in that has direct experience with these codes

[Ranger]

Am thinking the cause might be the vacuumed air pipes as the main break does not released automatically when I put the gear on Drive mood!!!!

Your parking brake release is electronic, not vacuum controlled.

[wajeh83]

These four codes appear to be your problem, they are all CURRENT

• B0429 - Temperature Control #3 Rear Circuit Range/Performance - Current

• B0248 - Mode Door Inoperative Error - Current

• B0269 - Air Inlet Door Range Error - Current

• B0408 - Temperature Control #1 (Main/Front) Circuit Malfunction - Current

The question is whether or not these codes are caused by the network (U)...

Check the connections at your left and right front position sensors to see if the wires are disconnected or corroded

Maybe someone will chime in that has direct experience with these codes

Dear freind

first of all thank you very much for kindly respond.

Could you please tell me where can I found these sensore (If you have steps pic. is better)

[wajeh83]

Am thinking the cause might be the vacuumed air pipes as the main break does not released automatically when I put the gear on Drive mood!!!!

Your parking brake release is electronic, not vacuum controlled.

Ok if its like what you said could you please tell me what I should to do to fix it

many thanks

[BodybyFisher]

You have these codes

• C0620 - Right Front Position Sensor Malfunction - His

• C0615 - Left Front Position Sensor Malfunction - His

I stated above:

Check the connections at your left and right front position sensors to see if the wires are disconnected or corroded

DTC C0620 Right Front Position Sensor Malfunction (use same info for LEFT side)

Circuit Description

The Continuously Variable Road Sensing Suspension (CVRSS) position sensor provides an analog voltage (0-5 volts) to the Electronic Suspension Control (ELC) module which represents the position between the body and the wheel.The Electronic Suspension Control (ELC) module provides the sensor with a 5.0 volt supply. The sensor is also grounded through the Electronic Suspension Control (ELC) module.

Conditions for Running the DTC

• The Ignition is on.
• The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.

Conditions for Setting the DTC

The DTC is set when the Electronic Suspension Control (ELC) module measures the position sensor signal voltage below 0.35 volts or above 4.75 volts for more than 1.0 second.

Action Taken When the DTC Sets

• The Electronic Suspension Control (ELC) module will enter the Speed Dependent damping mode.
• Both Left and Right Normal Force outputs will be set to the default output states.
• The SERVICE RIDE CONTROL message will be displayed.

Conditions for Clearing the MIL/DTC

• The scan tool can be used to clear the DTC.
• The On-Board diagnostic CLEAR RSS CODES feature can be used to clear the DTC.
• The DTC is saved as history when the Electronic Suspension Control (ELC) module no longer sees voltage outside the normal range. The DTC will clear if the fault does not return during 50 consecutive ignition cycles.

[BodybyFisher]

DTC B0429 Temperature Control #3 Rear Circuit Range/Performance

Circuit Description

The auxiliary air temperature actuator is an electronic stepper motor that is part of the air temperature actuator assembly. The HVAC control module supplies power and ground to the actuator. The HVAC control module controls the direction of the auxiliary air temperature actuator by changing the polarity of the control circuits. When the actuator reaches its desired position both circuits are fixed to the same value (9.5 to 12 volts). The HVAC control module determines the door position by counting pulses (voltage fluctuations) caused by the brush to commutator action generated during normal motor operation. The HVAC control module (IPM) monitors a voltage drop across an internal resistance to detect the pulses. The HVAC control module converts the pulses to counts with a range of 0 to 255 counts.

When a calibration or recalibration procedure is performed, the HVAC control module calculates the auxiliary air temperature door travel range. The HVAC control module commands the actuator to each extreme position and counts the total number of pulses. The HVAC control module compares the total number of pulses to calibrated limits. If the total pulse count is less than or equal to the maximum calibrated limit and greater than or equal to the minimum calibrated limit, then the calibration is considered successful.

Conditions for Running the DTC

The HVAC control module will run the DTC when either of the following conditions are met.

• The HVAC control module has completed a calibration/recalibration of the auxiliary air temperature actuator.
• The HVAC control module commands the actuator to move.

Conditions for Setting the DTC

The HVAC control module will set this DTC if either of the following conditions are true.

• The auxiliary air temperature actuator fails calibration/recalibration due to an over travel or under travel condition. (The HVAC control module does not detect the calibrated number of total pulse counts during a travel range check.)
• The HVAC control module determines that the actual door position does not equal the commanded door position. (The HVAC control module commands the door to move but does not see the expected number of pulses between positions.)

Action Taken When the DTC Sets

• The HVAC control module will attempt to make use of whatever range is still available.
• The HVAC control module will recalibrate the auxiliary air temperature actuator each time the ignition switch is turned ON.

Conditions for Clearing the DTC

• The DTC will become history if the HVAC control module no longer detects a failure.
• The history DTC will clear after 50 fault free ignition cycles.
• The DTC can be cleared with a scan tool.

Diagnostic Aids

• Inspect the auxiliary air temperature door and the air temperature actuator assembly for the following conditions:
• • A misaligned air temperature actuator assembly. Refer to Air Temperature Actuator Assembly Replacement.
  • Broken or binding linkages or auxiliary air temperature door
  • An obstruction that prevents the auxiliary air temperature door from operating within it's full range of motion
  • Missing seals to the auxiliary air temperature door
  • Misaligned seals to the auxiliary air temperature door

[BodybyFisher]

DTC B0248 Mode Door Inoperative Error

Circuit Description

The mode actuator is an electronic stepper motor. The HVAC control module (IPM) supplies power and ground to the actuator. The IPM controls the direction of the mode actuator by changing the polarity of the control circuits. When the actuator reaches its desired position, both circuits are fixed to the same value (9.5 to 12 volts). The IPM determines the door position by counting pulses (voltage fluctuations) caused by the brush to commutator action generated during normal motor operation. The IPM monitors a voltage drop across an internal resistance to detect the pulses. The IPM converts the pulses to counts with a range of 0 to 255 counts.

When a calibration or recalibration procedure is performed, the IPM calculates the mode door travel range. The IPM commands the actuator to each extreme position and counts the total number of pulses. The IPM compares the total number of pulses to calibrated limits. If the total pulse count is less than or equal to the maximum calibrated limit and greater than or equal to the minimum calibrated limit, then the calibration is considered successful.

Conditions for Running the DTC

The ignition is turned ON. This DTC runs during and after the next range check following the setting of DTC B0249.

Conditions for Setting the DTC

The IPM does not detect any movement of the mode actuator.

Action Taken When the DTC Sets

• The IPM commands the recirculation door to the outside air position.
• The IPM will recalibrate the mode actuator each time the ignition switch is turned ON.

Conditions for Clearing the MIL/DTC

• The DTC will become history if the IPM no longer detects a failure.
• The history DTC will clear after 50 fault free ignition cycles.
• The DTC can be cleared with a scan tool.

Diagnostic Aids

• Inspect the mode door and mode actuator for the following conditions:
  • A misaligned mode actuator.
  • Broken or binding linkages or mode door
  • Obstruction that prevents the mode door from operating within its full range of motion
  • Missing seals to the mode door
  • Misaligned seals to the mode door

[BodybyFisher]

DTC B0269 Air Inlet Door Range Error

Circuit Description

The recirculation actuator is an electronic stepper motor. The HVAC control module (IPM) supplies power and ground to the actuator. The IPM controls the direction of the recirculation actuator by changing the polarity of the control circuits. When the actuator reaches its desired position, both circuits are fixed to the same value (9.5 to 12 volts). The IPM determines the door position by counting pulses (voltage fluctuations) caused by the brush to commutator action generated during normal motor operation. The IPM monitors a voltage drop across an internal resistance to detect the pulses. The IPM converts the pulses to counts with a range of 0 to 255 counts.

When a calibration or recalibration procedure is performed, the IPM calculates the recirculation door travel range. The IPM commands the actuator to each extreme position and counts the total number of pulses. The IPM compares the total number of pulses to calibrated limits. If the total pulse count is less than or equal to the maximum calibrated limit and greater than or equal to the minimum calibrated limit, then the calibration is considered successful.

Conditions for Running the DTC

The IPM will run the DTC when either of the following conditions are met.

• The IPM has completed a calibration/recalibration of the recirculation actuator.
• The IPM commands the actuator to move.

Conditions for Setting the DTC

The IPM will set this DTC if either of the following conditions are true.

• The recirculation actuator fails calibration/recalibration due to an over travel or under travel condition. (The IPM does not detect the calibrated number of total pulse counts during a travel range check.)
• The IPM determines that the actual door position does not equal the commanded door position. (The IPM commands the door to move but does not see the expected number of pulses between positions.)

Action Taken When the DTC Sets

• The IPM will attempt to make use of whatever range is still available.
• The IPM will recalibrate the recirculation actuator each time the ignition switch is turned ON.

Conditions for Clearing the MIL/DTC

• The DTC will become history if the IPM no longer detects a failure.
• The history DTC will clear after 50 fault free ignition cycles.
• The DTC can be cleared with a scan tool.

Diagnostic Aids

• Inspect the recirculation door and recirculation actuator for the following conditions:
  • A misaligned recirculation actuator. Refer to Recirculation Actuator Replacement.
  • Broken or binding linkages or recirculation door
  • Obstruction that prevents the recirculation door from operating within its full range of motion
  • Missing seals to the recirculation door
  • Misaligned seals to the recirculation door

[BodybyFisher]

DTC B0408 Temperature Control #1 (Main/Front) Circuit Malfunction

Circuit Description

The left air temperature actuator is an electronic stepper motor. The HVAC control module supplies power and ground to the actuator. The HVAC control module controls the direction of the left air temperature actuator by changing the polarity of the control circuits. When the actuator reaches its desired position, both circuits are fixed to the same value (9.5 to 12 volts). The HVAC control module determines the door position by counting pulses (voltage fluctuations) caused by the brush to commutator action generated during normal motor operation. The HVAC control module (IPM) monitors a voltage drop across an internal resistance to detect the pulses. The HVAC control module converts the pulses to counts with a range of 0 to 255 counts.

When a calibration or recalibration procedure is performed, the HVAC control module calculates the left air temperature door travel range. The HVAC control module commands the actuator to each extreme position and counts the total number of pulses. The HVAC control module compares the total number of pulses to calibrated limits. If the total pulse count is less than or equal to the maximum calibrated limit and greater than or equal to the minimum calibrated limit, then the calibration is considered successful.

Conditions for Running the DTC

This DTC runs during and after the next range check following the setting of DTC B0409

Conditions for Setting the DTC

The HVAC control module does not detect any movement of the left air temperature actuator.

Action Taken When the DTC Sets

The HVAC control module will recalibrate the left air temperature actuator each time the ignition switch is turned ON.

Conditions for Clearing the DTC

• The DTC will become history if the HVAC control module no longer detects a failure.
• The history DTC will clear after 50 fault free ignition cycles.
• The DTC can be cleared with a scan tool.

Diagnostic Aids

• If condition not present refer to Testing for Intermittant and Poor Connections in Wiring Systems.
• Inspect the left air temperature door and left air temperature actuator for the following conditions:
  • A misaligned left air temperature actuator. Refer to Air Temperature Actuator Replacement.
  • Broken or binding linkages or left temperature door
  • An obstruction that prevents the left air temperature door from operating within it's full range of motion
  • Missing seals to the left air temperature door
  • Misaligned seals to the left air temperature door

[BodybyFisher]

This is related to the ABS system

DTC C1287 Steering Sensor Rate Malfunction w/JL4

Circuit Description

The steering wheel position sensor supplies 2 analog inputs, Phase A and Phase B, to the EBCM. The 2 input signals are approximately 90 degrees out of phase. By interpreting the relationship between the 2 inputs, the EBCM can determine the position of the steering wheel and the direction of steering wheel rotation.

Steer angle centering is the process by which the EBCM calibrates the steering sensor output so that the output reads zero when the steering wheel is centered. Using the yaw rate input, lateral accelerometer input, and wheel speed sensor inputs, the initial steering center position is calculated after driving greater than 10 km/h (6 mph) for more than 10 seconds in a straight line on a level surface.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

One of the following conditions occur:

• The steering wheel position sensor is synchronized and the steer rate (speed that the steering wheel appears to be turning) is greater than 1100 degrees/second.
• The steer rate is less than 10 degrees/second and the difference in the phase angle between Phase A and Phase B is greater than 20 degrees.
• The 2 steering sensor signals (Phase A and Phase B ) do not agree for 1 second. Under this condition, this DTC will set along with DTC C1281.

Action Taken When the DTC Sets

• The EBCM disables the VSES for the duration of the ignition cycle.
• The DIC displays the SERVICE STABILITY SYS message.
• The ABS/TCS remains functional.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
• The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

• During diagnosis, park the vehicle on a level surface.
• Check the vehicle for proper alignment. The car should not pull in either direction while driving straight on a level surface.
• Find out from the driver under what conditions the DTC was set (when the DIC displayed the SERVICE STABILITY SYS message). This information will help to duplicate the failure.
• The Snapshot function on the scan tool can help find an intermittent DTC.

[wajeh83]

DTC B0408 Temperature Control #1 (Main/Front) Circuit Malfunction

Many thanks for the information provided.

Do you have a picture steps on how to open the front interiors vents, A/C condi., and Radio console.

many thanks

[Ranger]

Am thinking the cause might be the vacuumed air pipes as the main break does not released automatically when I put the gear on Drive mood!!!!

Your parking brake release is electronic, not vacuum controlled.

Ok if its like what you said could you please tell me what I should to do to fix it

many thanks

I would first check to see if the electrical connector is plugged in at the parking brake release mechanism.

[OynxSTS]

This is related to the ABS system

DTC C1287 Steering Sensor Rate Malfunction w/JL4

Circuit Description

The steering wheel position sensor supplies 2 analog inputs, Phase A and Phase B, to the EBCM. The 2 input signals are approximately 90 degrees out of phase. By interpreting the relationship between the 2 inputs, the EBCM can determine the position of the steering wheel and the direction of steering wheel rotation.

Steer angle centering is the process by which the EBCM calibrates the steering sensor output so that the output reads zero when the steering wheel is centered. Using the yaw rate input, lateral accelerometer input, and wheel speed sensor inputs, the initial steering center position is calculated after driving greater than 10 km/h (6 mph) for more than 10 seconds in a straight line on a level surface.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

One of the following conditions occur:

• The steering wheel position sensor is synchronized and the steer rate (speed that the steering wheel appears to be turning) is greater than 1100 degrees/second.
• The steer rate is less than 10 degrees/second and the difference in the phase angle between Phase A and Phase B is greater than 20 degrees.
• The 2 steering sensor signals (Phase A and Phase B ) do not agree for 1 second. Under this condition, this DTC will set along with DTC C1281.

Action Taken When the DTC Sets

• The EBCM disables the VSES for the duration of the ignition cycle.
• The DIC displays the SERVICE STABILITY SYS message.
• The ABS/TCS remains functional.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
• The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

• During diagnosis, park the vehicle on a level surface.
• Check the vehicle for proper alignment. The car should not pull in either direction while driving straight on a level surface.
• Find out from the driver under what conditions the DTC was set (when the DIC displayed the SERVICE STABILITY SYS message). This information will help to duplicate the failure.
• The Snapshot function on the scan tool can help find an intermittent DTC.

This is a common issue with cars of this age with the Stabilitrak system. The sensor at the bottom of the steering column will intermittently fail and when it does, the car turns off the Stabiltity system till the next key on cycle. This code therefor will almost always be a "History" code... even though the problem is "Current".

To fix it you need to Re&re the column and replace the $80 steering sensor at the bottom... Not a hard project... but not an easy one either. But given the safety nature of the Stabilitrak system, this fix would be first on my list.

[wajeh83]

Hi there,

guys you doing realy great but I would like to have pictures of the steps on how to open the intrior to solve the problem of the A/C

parts need to be taken out; gloves box, radio console, the top dash, and under & above the steering

hope to get the pictures as soon as posible

many thanks

wajeh

[Texas Jim]

I would respectfully suggest getting a field service manual, if you plan on doing work on it yourself.

They have detailed instructions on "EVERYTHING" about your car.

They can be found for a reasonable price on ebay.

[BodybyFisher]

Hi there,

guys you doing realy great but I would like to have pictures of the steps on how to open the intrior to solve the problem of the A/C

parts need to be taken out; gloves box, radio console, the top dash, and under & above the steering

hope to get the pictures as soon as posible

many thanks

wajeh

Can't help with photos for 2000, you need to pick up a service manual on EBAY or at www.helminc.com You need it to do this kind of work

[wajeh83]

Hi there,

guys you doing realy great but I would like to have pictures of the steps on how to open the intrior to solve the problem of the A/C

parts need to be taken out; gloves box, radio console, the top dash, and under & above the steering

hope to get the pictures as soon as posible

many thanks

wajeh

Can't help with photos for 2000, you need to pick up a service manual on EBAY or at www.helminc.com You need it to do this kind of work

many thanks for the advice