DTC B1341 Air Mix Door Two Movement Fault. Cadillac Eldorado 2000

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2000 🢒 Eldorado 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 DTC B1341 Air Mix Door Two Movement Fault

HVAC Components
Temperature Sensors
Handling ESD Sensitive Parts Notice

Circuit Description

The heater and A/C programmer supplies voltage to an internal motor that drives the air mix door. The heater and A/C programmer monitors the air mix door position feedback from a sensor on the motor. If the air mix door is requested to move but the feedback voltage does not change, the heater and A/C programmer will store DTC B1341. If the air mix door feedback indicates that the feedback is near the hot or cold extreme, the DTC will not set. Evaluate the operation of the air mix door through self diagnostics as described in the test description.

Conditions for Running the DTC

•	The commanded air mix door is greater than 0%.

•	The commanded air mix door is less than 76%.

Failure Conditions

The actual air mix door is not within 3% of the commanded air mix door position within approximately 60 seconds.

Notes On Intermittence

If an intermittent DTC B1341 is set, complete the following steps:

Connect a Scan Tool .
Select the snapshot data for the air mix door #2.
Note the value of the feedback and commanded position.

3.1.	Use a Scan Tool override while monitoring the feedback value. Command the door to the high and low positions.

3.2.	Without keying OFF, physically inspect the air mix door linkage for any obstruction at these positions.

Test Description

Perform the Diagnostic System Check before continuing with the diagnosis of this DTC.

A Scan Tool allows for the direct control of the air mix door by observing the following conditions:

•	The air mix door position sensor feedback value

•	The value's difference from the air mix door commanded position value

These readings indicate a fault internal to the heater and A/C programmer in the air mix door sensor feedback.

Step

Action

Value(s)

Yes

Did you perform the diagnostic system check?

Go to Step 2

Go to Diagnostic System Check

With the engine running, connect a Scan Tool .
Turn the dual zone to the OFF position.
Adjust the temperature control on the control panel to the max hot and max cold positions.

Is the commanded (COM) position within 5 counts of the specified values?

COM Hot-10 counts

COM Cold- 250 counts

Go to Step 3

Go to Step 4

Compare the actual (ACT) counts to the commanded (COM) counts.

Are the ACT counts less than the COM counts specified value?

15 counts

Go to Step 6

Go to Step 5

Inspect the terminal contact.
If OK, replace the heater and A/C programmer. Refer to Programmer Replacement
Using the Scan Tool clear the code.

Is the repair complete?

Go to Diagnostic System Check

Turn the engine OFF.
Turn the ignition to the ON position.
Inspect the linkage between the air mix door and the actuator.
Inspect the air mix door for obstructions.

Are any of the conditions present?

Go to Step 8

Go to Step 7

Replace the heater and A/C programmer. Refer to Programmer Replacement
Using the Scan Tool clear the code.

Is the repair complete?

Go to Diagnostic System Check

Disconnect the actuator connector.
Inspect pin 10 CKT 705 for 5 V.
Inspect pin 5 CKT 147 for 12 V.
Inspect the following circuits for an open:

•

CKT 1814

•

CKT 407

•

CKT 831

Are any of the actuator circuits suspect?

Go to Step 10

Go to Step 9

Repair the condition. Refer to Wiring Repairs in Wiring Systems.
Adjust the air mix door linkage. Refer to Air Mix Actuator Replacement - Passenger
Using the Scan Tool clear the code.

Is the repair complete?

Go to Diagnostic System Check

Replace the actuator. Refer to Air Mix Actuator Replacement - Passenger
Using the Scan Tool clear the code.

Is the repair complete?

Go to Diagnostic System Check

Repair the suspect circuit. Refer to Wiring Repairs in Wiring Systems.
Using the Scan Tool clear the code.

Is the repair complete?

Go to Diagnostic System Check