GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Park Avenue 🢒 DTC 🢒 DTC B1334 Passenger Control Assembly Out Of Range

Object Number: 390984 Size: MF
HVAC Components
HVAC Air Delivery/Temperature Control Schematics
Cell 68: Temperature Controls
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The passenger temperature control assembly receives voltage signals from the HVAC Control Module (HCM). The signal voltage will vary from 5 volts (open circuit) to 0  volts (short circuit).

Conditions for Setting the DTC
    • The ignition is ON.
    • The circuit is open or shorted.

Action Taken When the DTC Sets

Code B1334 is set.

Conditions for Clearing the DTC
    • Using a Scan Tool .
    • A history DTC will clear after 50 fault free ignition cycles.
    • HCM battery voltage is interrupted.

Test Description

  1. Perform the Body Control Module (BCM) diagnostic system check before continuing with the diagnosis of this DTC.

    2.

  2. Determines if the passenger temperature control is operating properly.

    3.

  3. Ensures that the DTC was not set in error.

Step

Action

Value(s)

Yes

No

1

Was the BCM diagnostic system check performed?

--

Go to Step 2

Go to Diagnostic System Check - Body Control System

2

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the passenger temperature control assembly.
  3. Measure the resistance between passenger temperature control assembly connector terminals 8 and 10 while moving the control knob to the Full Cold, MID Range and the Full Hot setting.

Refer to Testing for Continuity in Wiring Systems.

Is the resistance near the specified range?

Full Cold - 1 kohms

MID - 5 kohms

Full Hot - 9 kohms

Reset 90 kohms

Go to Step 3

Go to Step 7

3
  1. Turn the ignition switch to the ON position.
  2. Measure the voltage between passenger temperature control assembly harness connector terminals 8 and 10.

Refer to Measuring Voltage in Wiring Systems.

Does the voltage equal the specified value?

5V

Go to Step 4

Go to Step 5

4

  1. Turn the ignition switch to the OFF position.
  2. Reconnect the passenger temperature control assembly.
  3. Turn the ignition switch to the ON position.
  4. Use a Scan Tool to clear the DTC.
  5. Cycle the ignition switch from the ON position to the OFF position several times.

Did the DTC reset?

--

Go to Step 9

Go to Intermittents and Poor Connections

5

Test for continuity between the passenger temperature control assembly harness connector terminal 8, the heater, and the A/C programmer connector terminal C15.

Refer to Testing for Continuity in Wiring Systems.

Is continuity present?

--

Go to Step 8

Go to Step 6

6

Repair the open in CKT 1812 (TAN).

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

7

Replace the passenger temperature control assembly. Refer to Control Assembly Replacement .

Is the replacement complete?

--

System OK

--

8

Repair an open in CKT 831 (DK BLU/WHT).

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

9
  1. Inspect for proper terminal contact. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
  2. If terminal contact is OK, replace the heater and the A/C programmer. Refer to Programmer Replacement

Is the replacement complete?

--

System OK

--