Pinpoint Test

CHECK FOR HVAC MODULE DTCs
1. Ignition ON.
2. Using a scan tool, perform a HVAC module self-test.
  Are DTCs C1B14:11 or C1B14:12 present?
  - Yes: REFER to Diagnostic Routine C: C1B14:11, C1B14:12 .
  - No : GO to 2 .

CHECK FOR VOLTAGE TO THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR

Ignition OFF.
Disconnect: In-Vehicle Temperature and Humidity Sensor.
Ignition ON.

Measure:

In-Vehicle Temperature and Humidity Sensor			Ground

C2247			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
3	LH111 (BN/WH)		-	Ground

Is the voltage between 4.7 and 5 volts?

Yes: For DTC B1A69:11, GO to 3 .
For DTC B1A69:15, GO to 4.
No : REPAIR the circuit.

CHECK THE HUMIDITY SIGNAL CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.
Disconnect: HVAC Module C228A

Measure:

In-Vehicle Temperature and Humidity Sensor			Ground

C2247			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
4	VH413 (WH/BU)		-	Ground

Is the resistance greater than 10, 000 ohms?

Yes: GO to 6.
No : REPAIR the circuit.

CHECK THE HUMIDITY SIGNAL CIRCUIT FOR AN OPEN CIRCUIT

Ignition OFF.
Disconnect: HVAC Module C228B.

Measure:

In-Vehicle Temperature and Humidity Sensor			HVAC Module

C2247			C228B
Pin	Circuit	Measurement / Action	Pin	Circuit
4	VH413 (WH/BU)		18	VH413 (WH/BU)

Is the resistance less than 3 ohms?

Yes: GO to 5 .
No : REPAIR the circuit.

CHECK THE HUMIDITY SIGNAL CIRCUIT FOR A SHORT TO POWER

Ignition ON.

Measure:

In-Vehicle Temperature and Humidity Sensor			Ground

C2247			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
4	VH413 (WH/BU)		-	Ground

Is any voltage present?

Yes: REPAIR the circuit.
No : GO to 6 .

ISOLATE THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR
1. Ignition OFF.
2. Connect: HVAC Module C228A.
3. Connect: HVAC Module C228B.
4. Install a new in-vehicle temperature and humidity sensor. REFER to In-Vehicle Temperature Sensor .
5. Ignition ON.
6. Using a scan tool, perform a HVAC module self-test.
  Does the DTC return?
  - Yes: GO to 7 .
  - No : The cause of the concern was an inoperative in-vehicle temperature and humidity sensor.
CHECK FOR CORRECT HVAC MODULE OPERATION
1. Ignition OFF.
2. Disconnect and inspect all HVAC module connectors.
3. Repair:
  - corrosion (install new connector or terminals - clean module pins)
  - damaged or bent pins - install new terminals/pins
  - pushed-out pins - install new pins as necessary
4. Reconnect the HVAC module connectors. Make sure they seat and latch correctly.
5. Operate the system and determine if the concern is still present.
  Is the concern still present?
  - Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new HVAC module. REFER to Heating Ventilation Air Conditioning (HVAC) Module .
  - No : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.