:  Mar 14, 2006



Overview

The complexity of the system is such that it is broken down into sub-sections.

For a detailed description of climate control operation, refer to the relevant section of the workshop manual:







Distribution motor self-test

The motor and flap operation can be checked using the on-board distribution motor self-test function.

The self-test can be initiated by pressing and holding the ECON and RECIRC buttons while turning the ignition switch to the ON position.

The control module will then compare the current motor position with the values stored in the module and will indicate an error by flashing the ECON LED (light emitting diode).

If there are no errors, the LED will go out and the system will function normally.

To confirm that there are no errors, turn the ignition switch to the OFF position, then back to the ON position.

Observe the operation of the programmed defrost LED.

If there are errors present, the programmed defrost LED will flash and the system will attempt to calibrate itself.

For additional information on the function of the system.


Inspection and Verification

. Verify the customer concern.

. Visually inspect for obvious mechanical or electrical faults.

Mechanical Electrical
  • Coolant level
  • Air vents (contaminated/blocked)
  • Auxiliary drive belt condition and tension
  • Air conditioning compressor
  • Fuses
  • Harnesses
  • Electrical connector(s)
  • Relays
  • Control module(s)
  • Control panel(s)
  • Air conditioning compressor

. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step

. Use the approved diagnostic system or a scan tool to retrieve any diagnostic trouble codes (DTCs) before moving onto the symptom chart or DTC index.
  Make sure that all DTCs are cleared following rectification.


Symptom chart

Symptom Possible causes Action
No climate control function, flashing LED at start-up
  • The system is in calibration mode
Check the motors and levers at the heating and ventilation assembly for damage/foreign objects jamming the movement of the flaps. For additional information on the self-calibration process, see the distribution motor self-test above.
Poor or no cooling
  • Air conditioning function
Carry out the checks from the visual inspection.

DTC index

:
  Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the manufacturer-approved diagnostic system).

DTC Description Possible causes Action
B1A5911 Sensor 5 volt supply (high line)
  • Sensor 5 volt supply: short circuit to ground
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A5913 Sensor 5 volt supply (high line)
  • Sensor 5 volt supply: high resistance
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6111 In-vehicle temperature sensor signal
  • In-vehicle temperature sensor signal: short circuit to ground
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6115 In-vehicle temperature sensor signal
  • In-vehicle temperature sensor signal: high resistance
  • In-vehicle temperature sensor signal: short circuit to power
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6211 Refrigerant pressure sensor signal
  • Refrigerant pressure sensor signal: short circuit to ground
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6215 Refrigerant pressure sensor signal
  • Refrigerant pressure sensor signal: short circuit to power
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6312 Right-hand solar sensor signal
  • Right-hand solar sensor signal: short circuit to 5 volts
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6412 Left-hand solar sensor signal
  • Left-hand solar sensor signal: short circuit to 5 volts
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6713 Sensor ground
  • Sensor ground circuit: high resistance
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6811 Ambient air temperature sensor signal
  • Ambient air temperature sensor signal: short circuit to ground
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6815 Ambient air temperature sensor signal
  • Ambient air temperature sensor signal: high resistance
  • Ambient air temperature sensor signal: short circuit to 5 volts
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6911 Humidity sensor signal
  • Humidity sensor signal: short circuit to ground
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6915 Humidity sensor signal
  • Humidity sensor signal: high resistance
  • Humidity sensor signal: short circuit to power
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A7001 Compressor solenoid valve
  • Compressor solenoid valve power circuit: short circuit to ground
  • Compressor solenoid valve power circuit: short circuit to power
  • Compressor solenoid valve: over temperature
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A7111 Air off temperature sensor
  • Air off temperature sensor circuit: short circuit to ground
Check the temperature sensor and circuit. Refer to the electrical guides.
B1A7115 Air off temperature sensor
  • Air off temperature sensor circuit: short circuit to power
  • Air off temperature sensor circuit: high resistance
Check the temperature sensor and circuit. Refer to the electrical guides.
B1A7318 Left-hand seat heater power supply
  • Left-hand seat heater power supply: high resistance
  • Left-hand seat heater power supply: short circuit to ground

B1A7418 Right-hand seat heater power supply
  • Right-hand seat heater power supply: current below threshold

B1A9815 Front LIN bus circuit
  • LIN bus: high resistance
  • LIN bus: short circuit to power
Check the LIN circuits. Refer to the electrical guides.
B1B6013 Feedback potentiometer circuit
  • Feedback potentiometer circuit: high resistance
Check the feedback potentiometer circuits. Refer to the electrical guides.
B1B6111 Pollution sensor HC/CO signal
  • Pollution sensor HC/CO signal: short circuit to ground
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B6211 Pollution sensor Nox signal
  • Pollution sensor Nox signal: short circuit to ground
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B6313 Sensor ground
  • Sensor ground: high resistance
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B6511 Left-hand seat heater temperature signal
  • Left-hand seat heater temperature signal: short circuit to ground

B1B6515 Left-hand seat heater temperature signal
  • Left-hand seat heater temperature signal: high resistance
  • Left-hand seat heater temperature signal: short circuit to power

B1B6611 Right-hand seat heater temperature signal
  • Right-hand seat heater temperature signal: short circuit to ground

B1B6615 Right-hand seat heater temperature signal/power supply
  • Right-hand seat heater temperature signal: high resistance
  • Right-hand seat heater temperature signal: short circuit to power
  • Right-hand seat heater power supply: high resistance
  • Right-hand seat heater power supply: short circuit to ground

B1B6711 Recirculation motor signal (intake air motor)
  • Recirculation motor signal: short circuit to ground
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B6715 Recirculation motor signal (intake air motor)
  • Recirculation motor signal: high resistance
  • Recirculation motor signal: short circuit to power
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B6801 Recirculation motor power/ground
  • Recirculation motor fault
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B7015 LIN bus circuit
  • LIN bus: high resistance
  • LIN bus: short circuit to power
Check the LIN circuits. Refer to the electrical guides.
B1B7088 LIN bus/pollution sensor/rear air conditioning control panel ground
  • LIN bus: high resistance
  • LIN bus: short circuit to ground
  • Pollution sensor supply: short circuit to power
  • Rear air conditioning control panel ground: high resistance
  • Rear air conditioning control panel ground: short circuit to power
Check the LIN circuits. Refer to the electrical guides.
B1B7111 Evaporator temperature sensor
  • Evaporator temperature sensor circuit: short circuit to ground
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B7115 Evaporator temperature sensor
  • Evaporator temperature sensor circuit: short circuit to power
  • Evaporator temperature sensor circuit: high resistance
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B7211 Front LIN bus power supply
  • LIN bus power supply circuit: short circuit to ground
Check the LIN circuits. Refer to the electrical guides.
B1B7311 Rear LIN bus power supply
  • LIN bus power supply circuit: short circuit to ground
Check the LIN circuits. Refer to the electrical guides.
B1B7400 Front foot/defrost actuator
  • Actuator mechanical fault
  • Actuator overheating
  • Actuator circuit: high resistance
  • Actuator circuit: short circuit
  • Actuator power failure
Check for mechanical faults (see visual inspection). Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B7449 Front foot/defrost actuator
  • Actuator internal fault
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B7700 Front right air blend actuator
  • Actuator mechanical fault
  • Actuator overheating
  • Actuator circuit: high resistance
  • Actuator circuit: short circuit
  • Actuator power failure
Check for mechanical faults (see visual inspection). Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B7749 Front right air blend actuator
  • Actuator internal fault
Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B7884 System pressure
  • Pressure signal below allowable range
  • Refrigerant leak
Check the air conditioning system.
B1B7885 System pressure
  • Pressure signal above allowable range
  • Condenser fault
  • Cooling fan fault
Check the air conditioning system.
Check the cooling fan function.
U007388 Medium speed CAN bus
  • CAN bus: short circuit to power
Check the CAN circuits. Refer to the electrical guides.
U030055 Medium speed CAN bus
  • CAN bus: configuration failure
  • CAN bus: short circuit to ground
Configure the module using the approved diagnostic system. Check the CAN circuits. Refer to the electrical guides.
U1A1449 Medium speed CAN bus
  • CAN bus: initialization failure
  • CAN bus: high resistance
Configure the module using the approved diagnostic system. Check the CAN circuits. Refer to the electrical guides.