B1035

B1035-INFRARED TEMPERATURE SENSOR 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 95% for a continuous period of 60 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 60 seconds.

Is this DTC active?

Yes

- Go To 2

No

- Go To 6

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




1. Turn the ignition off to the lock position.
2. Disconnect the A/C Heater Control C1 harness connector.
3. Disconnect the Infrared Sensor harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (C83) IR Sensor Signal circuit.

Is there any voltage present?

Yes

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

No

- Go To 3

3. CHECK THE (C830) IR SENSOR RETURN CIRCUIT FOR A SHORT TO VOLTAGE




1. Measure the voltage of the (C830) IR Sensor Return circuit.

Is there any voltage present?

Yes

- Repair the (C830) IR Sensor Return circuit for a short to voltage.
- Perform HVAC VERIFICATION TEST HVAC Verification Test.

No

- Go To 4

4. CHECK THE (C830) IR SENSOR RETURN CIRCUIT FOR AN OPEN




1. Turn the ignition off to the lock position.
2. Measure the resistance of the (C830) IR Sensor Return circuit between the A/C Heater Control C1 harness connector and the Infrared Sensor harness connector.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (C830) IR Sensor Return circuit for an open.
- Perform HVAC VERIFICATION TEST HVAC Verification Test.

No

- Go To 5

5. CHECK THE INFRARED SENSOR
1. Replace the Infrared Sensor.
2. Perform 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 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. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, partially broken wires.
4. Check the connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
5. Wiggle the wiring and connectors while checking for shorted and open circuits.
6. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.

Were there any problems found?

Yes

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

No

- Test complete.