B1035

B1035-INFRARED TEMPERATURE SENSOR INPUT CIRCUIT HIGH







- When Monitored:
With the ignition on.

- Set Condition:
The Infrared Temperature Sensor pulse with modulated (PWM) signal to the A/C Heater Control is greater than 12 volts for a continuous period of 120 seconds or more. If the A/C Heater Control detects a valid PWM signal, the DTC will change from active to stored and will stay stored for 100 ignition cycles.





Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

1. CHECK IF DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, read HVAC DTCs after a minimum of 120 seconds.

Is this DTC active?

Yes

- Go To 2

No

- Go To 6

2. CHECK THE (C83) INFRARED SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition off to the lock position.
2. Disconnect the A/C Heater Control harness connector.
3. Disconnect the Infrared Sensor harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (C83) Infrared Sensor Signal circuit.

Is there any voltage present?

Yes

- Repair the (C83) Infrared Sensor Signal circuit for a short to voltage.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 3

3. CHECK THE (C121) SENSOR GROUND CIRCUIT FOR A SHORT TO VOLTAGE




1. Measure the voltage of the (C121) Sensor Ground circuit.

Is there any voltage present?

Yes

- Repair the (C121) Sensor Ground circuit for a short to voltage.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 4

4. CHECK THE (C121) SENSOR GROUND CIRCUIT FOR AN OPEN




1. Turn the ignition off to the lock position.
2. Measure the resistance of the (C121) Sensor Ground circuit between the A/C Heater Control harness connector and the Infrared Sensor harness connector.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (C121) Sensor Ground circuit for an open.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 5

5. CHECK THE INFRARED SENSOR
1. Replace the Infrared Sensor.
2. Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

Did the DTC reset performing the HVAC Verification Test?

Yes

- Replace and program the A/C Heater Control.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Test complete.

6. CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.
3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
4. Wiggle the wiring and connectors while checking for shorted and open circuits.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Test complete.