DIAGNOSIS AND TESTING

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, refer to the relevant section of the workshop manual.

Inspection and Verification

Verify the customer concern.

Visually inspect for obvious mechanical or electrical faults.

Visual inspection

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.

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, refer to the relevant section of the workshop manual.

DTC index

NOTE:

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	Ambient air temperature sensor 5 volt supply short circuit to ground	Refer to the electrical guide and check the ambient air temperature sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A5913	Sensor 5 Volt Supply	Ambient air temperature sensor 5 volt supply high resistance	Refer to the electrical guide and check the ambient air temperature sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6111	Cabin Temperature Sensor	Ambient air temperature sensor signal short circuit to ground	Refer to the electrical guide and check the ambient air temperature sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6115	In-Vehicle Temperature Sensor Signal	Ambient air temperature sensor signal high resistance In-vehicle temperature sensor signal short circuit to power	Refer to the electrical guide and check the ambient air temperature sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6211	Pressure Sensor	A/C refrigerant pressure sensor signal short circuit to ground	Refer to the electrical guide and check the pressure sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6215	Pressure Sensor	A/C refrigerant pressure sensor signal short circuit to power	Refer to the electrical guide and check the pressure sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6312	Right Solar Sensor	Right-hand solar sensor signal short circuit to 5 volts	Refer to the electrical guides and check the right-hand sunlight sensor sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6412	Left Solar Sensor	Left-hand solar sensor signal short circuit to 5 volts	Refer to the electrical guides and check the left-hand sunlight sensor sensor circuit. 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 electrical guide and check the ambient air temperature sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6811	Ambient Temperature Sensor	Ambient air temperature sensor signal short circuit to ground	Refer to the electrical guide and check the ambient air temperature sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6815	Ambient Temperature Sensor	Ambient air temperature sensor signal high resistance Ambient air temperature sensor signal short circuit to 5 volts	Refer to the electrical guides and check the ambient air temperature sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6911	Humidity Sensor	Humidity sensor signal short circuit to ground	Refer to the electrical guides and check the humidity/temperature sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A6915	Humidity Sensor	Humidity sensor signal high resistance Humidity sensor signal short circuit to power	Refer to the electrical guides and check the humidity/temperature sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1A7001	Compressor Solenoid +ve Supply	Refrigerant solenoid valve power circuit short circuit to ground Refrigerant solenoid valve power circuit short circuit to power Refrigerant solenoid valve over temperature	Refer to the electrical guides and check the refrigerant solenoid circuit. 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 air off 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 air off sensor and circuit. Refer to the electrical guides.
B1A7318	Left Hand Seat Heater	Left-hand seat heater power supply high resistance Left-hand seat heater power supply short circuit to ground	Check the left-hand seat heater switch and circuit. Refer to the electrical guides.
B1A7418	Right Hand Seat Heater	Right-hand seat heater power supply current below threshold	Check the right-hand seat heater switch and circuit. Refer to the electrical guides.
B1A9815	LIN Bus Circuit #1	LIN bus high resistance LIN bus short circuit to power	Check the LIN circuits. Refer to the electrical guides.
B1B6013	Feedback Potentiometer Circuit	Air intake stuck in one position Feedback potentiometer circuit high resistance	Check the feedback potentiometer/air temperature mode motor circuits. Refer to the electrical guides.
B1B6111	Pollution Sensor HC Input Circuit	Pollution sensor HC/CO signal short circuit to ground	Check the pollution sensor circuit. Refer to the electrical guides. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B6211	Pollution Sensor - NOx	Pollution sensor Nox signal short circuit to ground	Check the pollution sensor NOx circuit. Refer to the electrical guides. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B6313	Feedback Potentiometer Ground Circuit	Sensor ground high resistance	Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B6511	Left Hand Seat Heater Temperature Sensor	Left-hand seat heater temperature signal short circuit to ground	Check the seat heater temperature signal circuit. Refer to the electrical guides. Refer to the relevant section of the workshop manual.
B1B6515	Left Hand Seat Heater Temperature Sensor	Left-hand seat heater temperature signal high resistance Left-hand seat heater temperature signal short circuit to power	Check the seat heater temperature signal circuit. Refer to the electrical guides. Refer to the relevant section of the workshop manual.
B1B6611	Right Hand Seat Heater Temperature Sensor	Right-hand seat heater temperature signal short circuit to ground	Check the seat heater temperature signal circuit. Refer to the electrical guides. Refer to the relevant section of the workshop manual.
B1B6615	Right Hand Seat Heater Temperature Sensor	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	Check the seat heater temperature signal circuit. Refer to the electrical guides. Refer to the relevant section of the workshop manual.
B1B6711	Air Intake Servo Potentiometer Circuit	Recirculation motor signal short circuit to ground	Check the intake air motor circuit. Refer to the electrical guides. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B6715	Air Intake Servo Potentiometer Circuit	Recirculation motor signal high resistance Recirculation motor signal short circuit to power	Check the intake air motor circuit. Refer to the electrical guides. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B6801	Air Intake Servo Motor	Recirculation motor fault	Check the intake air motor circuit. Refer to the electrical guides. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B7015	LIN Bus Circuit	Rear control panel non functional LIN bus high resistance LIN bus short circuit to power	Check the LIN circuits. Refer to the electrical guides.
B1B7088	LIN Bus Circuit	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	Check the evaporator temperature sensor circuit. Refer to the electrical guides. 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	Check the evaporator temperature sensor circuit. Refer to the electrical guides. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B7211	LIN Bus #1 Power Supply Circuit	LIN bus power supply circuit short circuit to ground	Check the LIN circuits. Refer to the electrical guides.
B1B7311	LIN Bus #2 Power Supply Circuit	LIN bus power supply circuit short circuit to ground	Check the LIN circuits. Refer to the electrical guides.
B1B7400	Foot/Defrost Damper Actuator	Actuator mechanical fault Actuator overheating Actuator circuit high resistance Actuator circuit short circuit Actuator power failure	Check for mechanical faults with the face/feet distribution motor (see visual inspection). Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B7449	Foot/Defrost Damper Actuator	Actuator internal fault	Check the face/feet distribution motor operation. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B7700	Front Right Air Blend Stepper Actuator	Actuator mechanical fault Actuator overheating Actuator circuit high resistance Actuator circuit short circuit Actuator power failure	Check for the right-hand air temperature motor mechanical faults (see visual inspection). Refer to the guided diagnostic routine for this code on the approved diagnostic system.
B1B7749	Front Right Air Blend Stepper 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. Refer to the relevant section of the workshop manual.
B1B7885	System Pressure	Pressure signal above allowable range Condenser fault Cooling fan fault	Check the air conditioning system and the cooling fan operation. Refer to the relevant section of the workshop manual.
U007388	Control Module Communication Bus 'A' Off	CAN bus connections short circuit to each other	Refer to the Network Communications section of the workshop manual.
U030055	Internal Control Module Software Incompatibility	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	CAN Initialization Failure	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.

Published: 11-May-2011

2007.0 Range Rover Sport (LS), 412-00

Climate Control System - General Information

Climate Control System (G300423)