GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 Park Avenue 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 DTC B1310 Ambient Air Temp Sensor Open Circuit

Object Number: 452103 Size: MF
HVAC Components
Cell 68: Temperature Sensors
Cell 68: Temperature Sensors
Handling ESD Sensitive Parts Notice

Circuit Description

The ambient air temperature sensor is a thermistor that controls signal voltage to the heater and A/C programmer. The heater and A/C programmer applies voltage on circuit 734. When the sensor is cold, the resistance is high and the heater and A/C programmer senses a high signal voltage at terminal B1, connector C2. When the sensor warms, resistance is reduced and the signal voltage is pulled low through circuit 61. Signal voltage varies from 5 V (open circuit) to 0 V (short circuit).

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

Action Taken When the DTC Sets
    • A blank is displayed on the drivers information center.
    • A default value of 15 degrees C (59 degrees F) will be used by the heater and A/C programmer to allow operation of the A/C system.

Conditions for Clearing the DTC
    • Use a Scan Tool .
    • A history DTC will clear after 50 consecutive ignition cycles have occurred without a malfunction.
    • Battery voltage to the body control module is interrupted.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Perform the Body Control Module Diagnostic System Check before continuing with the diagnosis of this DTC.

    2.

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

    3.

  3. Determines whether the malfunction is the sensor or if there is an open or a short in a circuit.

    4.

  4. Determines if the heater and A/C programmer is malfunctioning.

    5.

  5. TheScan Tool checks for proper sensor operation. Clear all DTCs after the repair procedures are complete.

DTC 1310 Ambient Air Temperature Sensor

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 in Body Control System

2
  1. Turn the ignition on.
  2. Measure the voltage between the ambient airtemp sensor harness connector terminal A and terminal B. Refer to Measuring Voltage in Wiring Systems.

Is the specified voltage measured?

4.5-5.5 V

Go to Step 3

Go to Step 4

3

  1. Turn the ignition off.
  2. Reconnect the sensor.
  3. Connect the Scan Tool .
  4. Turn the ignition on.
  5. Use the Scan Tool in order to clear the DTC.
  6. Start the engine.

Did the DTC reset?

--

Go to Step 4

Go to Intermittents and Poor Connections

4

  1. Connect the Scan Tool .
  2. Select the heater and A/C programmer open/short data.
  3. Display the ambient air temperature data.
  4. Start the engine.
  5. Unplug the ambient temperature sensor.
  6. The ambient temperature sensor voltage increases to 5 V.
  7. Reconnect the ambient temperature sensor connector.

Did the ambient temperature sensor voltage decrease?

--

Go to Step 5

Go to Step 6

5

Replace the sensor.

Refer to Ambient Temperature Sensor Replacement . Is the replacement complete?

--

Go to Step 9

--

6

Inspect CKT 61 (YEL) for an open or a short.

Was an open or short located?

--

Go to Step 8

Go to Step 7

7

  1. Inspect CKT 735 (LT GRN/BLK) for an open or a short.
  2. If the CKT is OK, replace the heater and A/C programmer. Refer to Programmer Replacement .

Is the replacement complete?

--

Go to Step 9

--

8

Repair the open in CKT 61 (YEL). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 9

--

9

  1. Use the Scan Tool in order to clear all of the DTCs.
  2. Confirm the proper operation of the A/C system.

Is the A/C system operating properly?

--

Go to Diagnostic System Check - Body Control System in Body Control System

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