GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1999 🢒 Aurora 🢒 DTC 🢒 DTC B1036 Pass Temp Cntrl Feedback Out of Range

Object Number: 403737 Size: MF
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
HVAC Components
Cell 68: Temperature Sensors
Cell 50: Serial Data UART

Circuit Description

The passenger temperature control assembly receives voltage signals from the HVAC programmer. 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 DTC B1036 is set.

Conditions for Clearing the DTC
    • Using a Scan Tool .
    • A history DTC will clear when 40 consecutive ignition cycles have occurred without a malfunction.
    • HVAC battery voltage is interrupted.

Step

Action

Value(s)

Yes

No

1
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the passenger temperature control assembly.
  3. Measure the resistance between terminal A and terminal B of the pigtail connector on the passenger temperature control assembly while turning the control knob to the following settings:
    4. • FULL COLD
    • MID RANGE
    • FULL HOT

Refer to Testing for Continuity in Wiring Systems.

Do the resistances measure approximately within the specified ranges?
    • 4.8-5.0 Kohms in FULL COLD
    • 2.5-2.7 Kohms in MID RANGE
    • 96.0-104.0 Kohms in FULL HOT

Go to Step 2

Go to Step 3

2
  1. Turn the ignition switch to the RUN position.
  2. Measure the voltage between terminal A and terminal B of the passenger temperature control assembly.

Refer to Measuring Voltage in Wiring Systems.

Does the voltage approximately equal the specified value?

5 V

Go to Step 5

Go to Step 4

3

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

Is the repair complete?

--

System OK

--

4

Measure the voltage between terminal A and terminal B of the passenger temperature control assembly.

Refer to Measuring Voltage in Wiring Systems.

Is the voltage more than the specified value?

5 V

Go to Step 7

Go to Step 6

5
  1. Turn the ignition switch to the OFF position.
  2. Reconnect the passenger temperature control assembly.
  3. Turn the ignition switch to the RUN position.
  4. Using the Scan Tool , clear the DTC.
  5. Turn the ignition switch to the OFF position.
  6. Turn the ignition switch to the RUN position.

Does the DTC reset?

--

Go to Step 10

Go to Intermittents and Poor Connections

6

Measure the voltage between terminal E of the passenger control assembly harness connector and terminal 4 of the DLC.

Refer to Measuring Voltage in Wiring Systems.

Does the voltage approximately equal the specified value?

5 V

Go to Step 8

Go to Step 9

7

Repair the short to battery in CKT 1812.

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

8

Measure the voltage between terminal B of the passenger control assembly harness connector and terminal 4 of the DLC.

Refer to Measuring Voltage in Wiring Systems.

Does the voltage approximately equal the specified value?

5 V

Go to Step 11

Go to Step 10

9

Backprobe and measure the voltage between the HVAC programmer terminal B5 and the DLC terminal 4.

Refer to Probing Electrical Connectors and Measuring Voltage in Wiring Systems.

Does the voltage approximately equal the specified value?

5 V

Go to Step 14

Go to Step 15

10

Test for continuity between terminal B of the passenger control assembly harness connector and terminal C15 of the HVAC programmer connector.

Refer to Testing for Continuity in Wiring Systems.

Is continuity present?

--

Go to Step 13

Go to Step 12

11

Repair the short to voltage in CKT 1812.

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

12
  1. Inspect CKT 1812 for opens.
  2. If the circuit is in proper condition, replace the HVAC programmer. Refer to Programmer Replacement .

Is the repair complete?

--

System OK

--

13

Repair the open in CKT 1812.

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

14

Repair the open in CKT 831.

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

15

Replace the programmer. Refer to Programmer Replacement .

Is the repair complete?

--

System OK

--