Pinpoint Test

CHECK THE HVAC MODULE FOR DTCs
1. Ignition ON.
2. Using a scan tool, perform the HVAC module self-test.
  Is DTC B10B9:12 present?
  - Yes: GO to 7.
  - No : GO to 2 .
CHECK THE BLOWER MOTOR OPERATION USING ACTIVE COMMANDS
1. Using a scan tool, view HVAC Module PIDs .
2. Select panel mode on the HVAC controls.
3. Select the lowest blower motor setting.
4. Monitor blower motor speed while using the scan tool to operate the HVAC module active command BLOWRSPD, increasing and decreasing the percentage value.
  Does the blower motor speed change between low and high when the active command is changed?
  - Yes : INSTALL a new FCIM.
    REFER to FRONT CONTROLS INTERFACE MODULE (FCIM) - (Premium),
    
    REFER to FRONT CONTROLS INTERFACE MODULE (FCIM) - (Premium Plus), or
    
    REFER to FRONT CONTROLS INTERFACE MODULE (FCIM) - (Sony® Sound).
  - No : GO to 3 .

CHECK THE BLOWER MOTOR RELAY COIL SWITCH GROUND CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.
Disconnect: Blower Motor Relay.
Disconnect: HVAC Module C228A.

Measure:

BJB			Ground

Blower Motor Relay Socket			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
1	CH123 (VT/GN)		-	Ground

Is the resistance greater than 10, 000 ohms?

Yes: GO to 4 .
No : REPAIR the circuit.

CHECK THE BLOWER MOTOR VOLTAGE CIRCUIT FOR A SHORT TO VOLTAGE

Disconnect: Blower Motor.
Ignition ON.

Measure:

Blower Motor			Ground

C2004			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
1	CH402 (YE/GN)		-	Ground

Is any voltage present?

Yes: GO to 5 .
No : GO to 6.

CHECK FOR VOLTAGE AT THE BLOWER MOTOR WITH THE BLOWER MOTOR RELAY DISCONNECTED

Disconnect: Blower Motor.
Ignition ON.

Measure:

Blower Motor			Ground

C2004			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
1	CH402 (YE/GN)		-	Ground

Is any voltage present?

Yes: REPAIR the circuit.
No : INSTALL a new blower motor relay.

CHECK THE BLOWER MOTOR SPEED CONTROLLER FUNCTIONALITY
1. Ignition OFF.
2. Install a known good blower motor speed controller.
3. Ignition ON.
4. Operate the blower motor.
  Does the blower motor function correctly?
  - Yes: INSTALL a new blower motor speed controller. REFER to Blower Motor Speed Control .
  - No : GO to 8.

CHECK THE BLOWER MOTOR SPEED CONTROL COMMAND CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.
Disconnect: Blower Motor Speed Control.
Disconnect: HVAC Module C228A.
Ignition ON.

Measure:

Blower Motor Speed Control			Ground

C271			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
3	VH101 (WH/VT)		-	Ground

Is any voltage present?

Yes: REPAIR the circuit.
No : CONNECT blower motor speed control. GO to 8 .

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.