Ford Fiesta: Auxiliary Climate Control / Auxiliary Climate Control. Diagnosis and Testing

DTC Chart: Heating, Ventilation And Air Conditioning (HVAC) Control Module

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. For information about these practices,
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

DTC Chart: Instrument Panel Cluster (IPC)

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. For information about these practices,
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Network Diagnostic Trouble Codes (DTCs) (U-codes) are often a result of intermittent concerns such as damaged wiring or low battery voltage occurrences. Additionally, vehicle repair procedures, such as module reprogramming, often set network Diagnostic Trouble Codes (DTCs). Replacing a module to resolve a network DTC is unlikely to resolve the concern. To prevent repeat network DTC concerns, inspect all network wiring, especially connectors. Test the vehicle battery.
REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

Symptom Chart(s)

Symptom Chart: Electric Booster Heater

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. For information about these practices,
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Pinpoint Tests

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. For information about these practices,
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

The Electric Booster Heater is Inoperative/Does Not Operate Correctly

Refer to Wiring Diagrams Cell 54 for schematic and connector information. Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Electric Booster Heater,
REFER to: Auxiliary Climate Control - System Operation and Component Description (412-02 Auxiliary Climate Control, Description and Operation).

  DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Electric booster heater relay 1 & 2
• Electric booster heater
• HVAC module
• IPC

Visual Inspection and Diagnostic Pre-checks

• Inspect CJB fuse 2 (7.5A).
• Inspect High Current BJB mega fuse 4 (70A) and mega fuse 5 (50A).
• Inspect the Electric booster heater relays for looseness or corrosion.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Diagnose and repair all HVAC module DIAGNOSTIC TROUBLE CODES (DTCs) before continuing with this pinpoint test.

NOTE: Make sure operating conditions for the operation of the electric booster heater are met. To activate the electric booster heater request, turn the temperature control knob to full warm. To deactivate the electric booster heater request, turn the temperature control knob to cool.

A1 CHECK THE ELECTRIC BOOSTER HEATER RELAYS

Ignition OFF. Perform the Relay - High Current ISO component test. Refer to Wiring Diagrams Cell 149 for schematic and connector information. Do the electric booster heater relays pass the component test? Yes GO to A2 No INSTALL new relays as needed.

A2 CHECK THE IPC (INSTRUMENT PANEL CLUSTER) FOR DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition ON. Using a diagnostic scan tool, perform the IPC self-test. Are DTCs B10EA:00 or B10EA:01 retrieved? Yes For B10EA:00, GO to A5 For B10EA:01, GO to Pinpoint Test B No GO to A3

A3 CHECK THE ELECTRIC BOOSTER HEATER RELAY COIL SUPPLY VOLTAGE

Ignition OFF. Disconnect Electric booster heater relay 1. Disconnect Electric booster heater relay 2. Ignition ON. Measure: Click to display connectors Positive Lead Measurement / Action Negative Lead Electric booster heater relay 1 socket 1   Ground Electric booster heater relay 2 socket 1   Ground Are the voltages greater than 11 volts? Yes GO to A4 No VERIFY CJB fuse 2 (7.5A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

A4 CHECK THE ELECTRIC BOOSTER HEATER RELAY SWITCHED VOLTAGE SUPPLY CIRCUITS

Measure: Click to display connectors Positive Lead Measurement / Action Negative Lead Electric booster heater relay heater relay 1 socket 3   Ground Electric booster heater relay heater relay 2 socket 3   Ground Are the voltages greater than 11 volts? Yes GO to A5 No VERIFY High Current BJB mega fuse 4 (70A) and mega fuse 5 (50A) are OK. If OK, REPAIR the circuit in question. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

A5 CHECK THE ELECTRIC BOOSTER HEATER RELAY COIL CONTROL CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF. Disconnect Instrument panel cluster C220A . Ignition ON. Measure: Click to display connectors Positive Lead Measurement / Action Negative Lead Electric booster heater relay heater relay 1 socket 2   Ground Electric booster heater relay heater relay 2 socket 2   Ground Is any voltage present? Yes REPAIR the circuit in question. No GO to A6

A6 CHECK THE ELECTRIC BOOSTER HEATER CIRCUITS FOR A SHORT TO GROUND

Ignition OFF. Disconnect Electric booster heater. Measure: Click to display connectors Positive Lead Measurement / Action Negative Lead   C2603-1   Ground   C2603-2   Ground Are the resistances greater than 10,000 ohms? Yes GO to A7 No REPAIR the circuit in question.

A7 CHECK THE ELECTRIC BOOSTER HEATER CIRCUITS FOR AN OPEN

Measure: Click to display connectors Positive Lead Measurement / Action Negative Lead   C2603-1 Electric booster heater relay 1 socket 5   C2603-2 Electric booster heater relay 2 socket 5 Are the resistances less than 3 ohms? Yes GO to A8 No REPAIR the circuit in question.

A8 CHECK THE ELECTRIC BOOSTER HEATER CIRCUITS FOR A SHORT TOGETHER

Measure: Click to display connectors Positive Lead Measurement / Action Negative Lead   C2603-1   C2603-2 Is the resistance greater than 10,000 ohms? Yes GO to A9 No REPAIR the circuit in question.

A9 CHECK THE ELECTRIC BOOSTER HEATER GROUND

Disconnect and inspect the electric booster heater ground connection. Repair: corrosion (replace connector or terminals – clean module pins) Reconnect the electric booster heater ground connection. Operate the system and verify the concern is still present. Is the concern still present? Yes GO to A10 No The system is operating correctly at this time. The concern may have been caused a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

A10 CHECK THE ELECTRIC BOOSTER HEATER CONNECTIONS

Disconnect and inspect the electric booster heater connector. Repair: corrosion (replace connector or terminals – clean module pins) damaged or bent pins – replace terminals/pins pushed-out pins – replace pins as necessary Reconnect the electric booster heater connector. Make sure it seats and latches correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes INSTALL a new electric booster heater. REFER to: Electric Booster Heater (412-02 Auxiliary Climate Control, Removal and Installation). If the concern is still present, GO to A11 No The system is operating correctly at this time. The concern may have been caused a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

A11 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) MODULE OPERATION

Ignition OFF. Disconnect and inspect all HVAC control module connectors. 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 Reconnect the HVAC control module connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes CHECK On-Line Automotive Service Information System (OASIS) for any applicable Technical Service Bulletins (TSBs). If a Technical Service Bulletin (TSB) exists for this concern, DISCONTINUE this test and FOLLOW Technical Service Bulletin (TSB) instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new HVAC control module. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation). If the concern is still present, GO to A12 No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

A12 CHECK FOR CORRECT INSTRUMENT PANEL CLUSTER (IPC) OPERATION

Ignition OFF. Disconnect and inspect the IPC connector. Repair: corrosion (replace connector or terminals – clean module pins) damaged or bent pins – replace terminals/pins pushed-out pins – replace pins as necessary Reconnect the IPC connector. Make sure it seats and latches correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern,    Click here to access Guided Routine (IPC). 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.

DTCs B10EA:01 or 5-5

Refer to Wiring Diagrams Cell 54 for schematic and connector information.

Normal Operation and Fault Conditions

Electric Booster Heater, Electric Booster Heater,
REFER to: Auxiliary Climate Control - System Operation and Component Description (412-02 Auxiliary Climate Control, Description and Operation).

  DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• HVAC control module
• IPC

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

B1 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE FOR DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition ON. Using the Self-Test — Retrieving And Clearing Heating, Ventilation And Air Conditioning (HVAC) Module DTCs, perform the HVAC control module self-test. REFER to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) (412-00 Climate Control System - General Information, Diagnosis and Testing). Is DTC 5-5 retrieved? Yes GO to B3 No GO to B2

B2 CHECK THE IPC (INSTRUMENT PANEL CLUSTER) FOR DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition ON. Using a diagnostic scan tool, perform the IPC self-test. Are DTCs B10EA:00 or B10EA:01 retrieved? Yes For B10EA:00, GO to Pinpoint Test A For B10EA:01, GO to B3 No For all other IPC Diagnostic Trouble Codes (DTCs), REFER to: Instrumentation, Message Center and Warning Chimes (413-01 Instrumentation, Message Center and Warning Chimes, Diagnosis and Testing).

B3 CHECK THE ELECTRIC BOOSTER HEATER REQUEST CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF. Disconnect Instrument panel clusterC220A . Disconnect Heating, ventilation and air conditioning module C2357A . Ignition ON. Measure: Click to display connectors Positive Lead Measurement / Action Negative Lead   C2357A-20   Ground Is any voltage present? Yes REPAIR the circuit in question. No GO to B4

B4 CHECK THE ELECTRIC BOOSTER HEATER REQUEST CIRCUIT FOR A SHORT TO GROUND

Ignition OFF. Measure: Click to display connectors Positive Lead Measurement / Action Negative Lead   C2357A-20   Ground Are the resistances greater than 10,000 ohms? Yes GO to B5 No REPAIR the circuit in question.

B5 CHECK THE ELECTRIC BOOSTER HEATER REQUEST CIRCUIT FOR AN OPEN

Measure: Click to display connectors Positive Lead Measurement / Action Negative Lead   C2357A-20   C220A-21 Is the resistance less than 3 ohms? Yes GO to B6 No REPAIR the circuit.

B6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) MODULE OPERATION

Ignition OFF. Disconnect and inspect all HVAC module connectors. 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 Reconnect the HVAC module connectors. Make sure they seat and latch correctly. Reconnect the IPC connector. Make sure it seats and latches correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes CHECK On-Line Automotive Service Information System (OASIS) for any applicable Technical Service Bulletins (TSBs). If a Technical Service Bulletin (TSB) exists for this concern, DISCONTINUE this test and FOLLOW Technical Service Bulletin (TSB) instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new HVAC control module. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation). If the concern is still present, GO to B7 No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

B7 CHECK FOR CORRECT INSTRUMENT PANEL CLUSTER (IPC) OPERATION

Ignition OFF. Disconnect and inspect the IPC connector. Repair: corrosion (replace connector or terminals – clean module pins) damaged or bent pins – replace terminals/pins pushed-out pins – replace pins as necessary Reconnect the IPC connector. Make sure it seats and latches correctly. Operate the system and verify the concern is still present. Is the concern still present? Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern,    Click here to access Guided Routine (IPC). 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.