Acura RL. Manual - part 557

Fig. 10: Navigation System Diagnostic Mode (Display Panel)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

TROUBLESHOOTING INFORMATION CHART

Display Panel

Item

TR sensor open

An open in-car temperature sensor circuit (see DTC B1225 OR TR SENSOR
OPEN IS INDICATED: AN OPEN IN THE IN-CAR TEMPERATURE
SENSOR CIRCUIT )

TR sensor short

A short in the in-car temperature sensor circuit (see DTC B1226 OR TR SENSOR
SHORT IS INDICATED: A SHORT IN THE IN-CAR TEMPERATURE
SENSOR CIRCUIT )

TMA sensor
open

An open in the outside air temperature sensor circuit (see DTC B1227 OR TAM
SENSOR OPEN IS INDICATED: AN OPEN IN THE OUTSIDE AIR
TEMPERATURE SENSOR CIRCUIT )

TMA sensor
short

A short in the outside air temperature sensor circuit (see DTC B1228 OR TAM
SENSOR SHORT IS INDICATED: A SHORT IN THE OUTSIDE AIR
TEMPERATURE SENSOR CIRCUIT )

TS sensor open

An open in the sunlight sensor circuit (see DTC B1229 OR TS SENSOR OPEN IS
INDICATED: AN OPEN IN THE SUNLIGHT SENSOR CIRCUIT )

TS sensor short

A short in the sunlight sensor circuit (see DTC B1230 OR TS SENSOR SHORT IS
INDICATED: A SHORT IN THE SUNLIGHT SENSOR CIRCUIT )

TE sensor open

An open in the evaporator temperature sensor circuit (see DTC B1231 OR TE
SENSOR OPEN IS INDICATED: AN OPEN IN THE EVAPORATOR
TEMPERATURE SENSOR CIRCUIT )

TE sensor short

A short in the evaporator temperature sensor circuit (see DTC B1232 OR TE
SENSOR SHORT IS INDICATED: A SHORT IN THE EVAPORATOR
TEMPERATURE SENSOR CIRCUIT )

DrVENT sensor
open

An open in the driver's vent air temperature sensor circuit (see DTC B2975 OR
DRVENT SENSOR OPEN IS INDICATED: AN OPEN IN THE DRIVER'S
VENT AIR TEMPERATURE SENSOR CIRCUIT )

DrVENT sensor
short

A short in the driver's vent air temperature sensor circuit (see DTC B2976 OR
DRVENT SENSOR SHORT IS INDICATED: A SHORT IN THE DRIVER'S
VENT AIR TEMPERATURE SENSOR CIRCUIT )

PaVENT sensor
open

An open in the passenger's vent air temperature sensor circuit (see DTC B2977 OR
PA VENT SENSOR OPEN IS INDICATED: AN OPEN IN THE
PASSENGER'S VENT AIR TEMPERATURE SENSOR CIRCUIT )

PaVENT sensor
short

A short in the passenger's vent air temperature sensor circuit (see DTC B2978 OR
PA VENT SENSOR SHORT IS INDICATED: A SHORT IN THE
PASSENGER'S VENT AIR TEMPERATURE SENSOR CIRCUIT )

2007 Acura RL

2005-08 HVAC HVAC - RL

Friday, June 05, 2009 2:25:42 PM

Page 11

PRE sensor
open

An open in the A/C pressure sensor circuit (see DTC B2979 OR PRE SENSOR
OPEN IS INDICATED: AN OPEN IN THE A/C PRESSURE SENSOR
CIRCUIT )

PRE sensor
short

A short in the A/C pressure sensor circuit (see DTC B2980 OR PRE SENSOR
SHORT IS INDICATED: A SHORT IN THE A/C PRESSURE SENSOR
CIRCUIT )

Blower motor
lock

A problem in the blower motor circuit (see DTC B1241 OR BLOWER MOTOR
LOCK IS INDICATED: A PROBLEM IN THE BLOWER MOTOR
CIRCUIT )

NAVI
communication
error

Climate control unit lost communication with navigation unit (see DTC B2981 OR
NAVI COMMUNICATION ERROR IS INDICATED: CLIMATE CONTROL
UNIT LOST COMMUNICATION WITH NAVIGATION UNIT )

Audio
communication
error

Climate control unit lost communication with audio unit (see DTC B2991 OR
AUDIO COMMUNICATION ERROR IS INDICATED: CLIMATE
CONTROL UNIT LOST COMMUNICATION WITH AUDIO UNIT )

BUS
communication
error

Climate control unit lost communication with each control motor (see DTC B2982
OR BUS COMMUNICATION ERROR IS INDICATED: CLIMATE
CONTROL UNIT LOST COMMUNICATION WITH EACH CONTROL
MOTOR )

DrA/M motor
lock

A problem in the driver's air mix control linkage, door, or motor (see DTC B1235
OR DRA/M MOTOR LOCK IS INDICATED: A PROBLEM IN THE
DRIVER'S AIR MIX CONTROL LINKAGE, DOOR, OR MOTOR )

PaA/M motor
lock

A problem in the passenger's air mix control linkage, door, or motor (see DTC
B1238 OR PAA/M MOTOR LOCK IS INDICATED: A PROBLEM IN THE
PASSENGER'S AIR MIX CONTROL LINKAGE, DOOR, OR MOTOR )

Mode motor
lock

A problem in the mode control linkage, doors, or motor (see DTC B1240 OR
MODE MOTOR LOCK IS INDICATED: A PROBLEM IN THE MODE
CONTROL LINKAGE, DOORS, OR MOTOR )

R/F motor lock

A problem in the recirculation control linkage, door, or motor (see DTC B2983 OR
R/F MOTOR LOCK IS INDICATED: A PROBLEM IN THE
RECIRCULATION CONTROL LINKAGE, DOOR, OR MOTOR )

DrC/V motor
lock

A problem in the driver's cool vent control linkage, door, or motor (see DTC B2984
OR DRC/V MOTOR LOCK IS INDICATED: A PROBLEM IN THE
DRIVER'S COOL VENT CONTROL LINKAGE, DOOR, OR MOTOR )

PaC/V motor
lock

A problem in the passenger's cool vent control linkage, door, or motor (see DTC
B2985 OR PAC/V MOTOR LOCK IS INDICATED: A PROBLEM IN THE
PASSENGER'S COOL VENT CONTROL LINKAGE, DOOR, OR MOTOR )

RrVENT motor
lock

A problem in the rear vent control linkage, door, or motor (see DTC B2987 OR
RRVEISIT MOTOR LOCK IS INDICATED: A PROBLEM IN THE REAR
VENT CONTROL LINKAGE, DOOR, OR MOTOR )

COMP
Solenoid error

A problem in the variable capacity control solenoid valve circuit (see COMP
SOLENOID ERROR IS INDICATED: A PROBLEM IN THE VARIABLE
CAPACITY CONTROL SOLENOID VALVE CIRCUIT )

EEPROM error Climate control unit internal error (see DTC TROUBLESHOOTING )

Climate control unit lost communication with gauge control module (ECT message)
(see DTC B1205 OR VEHICLE SPEED ERROR OR ENGNE ERROR IS
INDICATED: CLIMATE CONTROL UNIT LOST COMMUNICATION
WITH GAUGE CONTROL MODULE (VSP/NE MESSAGE); DTC B1206 OR
TW SENSOR ERROR IS INDICATED: CLIMATE CONTROL UNIT LOST

2007 Acura RL

2005-08 HVAC HVAC - RL

Friday, June 05, 2009 2:25:42 PM

Page 12

Displaying Sensor Inputs at the Climate Control Unit

The climate control unit has a mode that displays sensor inputs it receives. This mode shows you what the
climate control unit is receiving from each of the sensors, one at a time, and it can help you determine if a
sensor is faulty.

Check these items before using the sensor input display mode

1. Turn the ignition switch ON (II), and check the recirculation door function; press the recirculation

button to switch from FRESH to RECIRC. The air volume and sound should change slightly.

2. Set the temperature control knob to the desired test temperature. When selecting the test temperature,

note these items:



"Lo" temperature setting will default to MAX COOL, VENT, and RECIRC.



"Hi" temperature setting will default to MAX HOT, FLOOR, and FRESH.



58 through 86°F settings will use the automatic climate control logic.

3. Turn the ignition switch OFF.

To run the sensor input display mode, follow these steps

4. Turn the ignition switch OFF.

5. Press and hold both the AUTO and recirculation buttons while starting the engine. Release the

buttons.

6. Turn the ignition switch ON (II). Use the navigation display hard buttons as described below:



Make sure the battery is connected, then press and hold the three buttons (Menu, Map/Guide,
and Cancel), and keep them pressed for approximately 5 seconds. The display screen will go
directly to the "Select Diagnosis Items" menu shown below.



Touch the Unit Check button, then touch the Aircon button.

TROUBLESHOOTING INFORMATION CHART

TW sensor error

COMMUNICATION WITH GAUGE CONTROL MODULE (ECT
MESSAGE); DTC B1207: CLIMATE CONTROL UNIT LOST
COMMUNICATION WITH GAUGE CONTROL MODULE (ILLUMI
MESSAGE); DTC B1208: CLIMATE CONTROL UNIT LOST
COMMUNICATION WITH KEYLESS ACCESS CONTROL UNIT (FOB ID
MESSAGE) )

Vehicle speed
error

Climate control unit lost communication with gauge control module (VSP/NE
message) (see DTC B1205 OR VEHICLE SPEED ERROR OR ENGNE ERROR
IS INDICATED: CLIMATE CONTROL UNIT LOST COMMUNICATION
WITH GAUGE CONTROL MODULE (VSP/NE MESSAGE); DTC B1206 OR
TW SENSOR ERROR IS INDICATED: CLIMATE CONTROL UNIT LOST
COMMUNICATION WITH GAUGE CONTROL MODULE (ECT
MESSAGE); DTC B1207: CLIMATE CONTROL UNIT LOST
COMMUNICATION WITH GAUGE CONTROL MODULE (ILLUMI
MESSAGE); DTC B1208: CLIMATE CONTROL UNIT LOST
COMMUNICATION WITH KEYLESS ACCESS CONTROL UNIT (FOB ID
MESSAGE) )

ENGNe error

Display

Displayed

2007 Acura RL

2005-08 HVAC HVAC - RL

Friday, June 05, 2009 2:25:42 PM

Page 13

7. To cancel the sensor input display mode, press the AUTO button or turn the ignition switch OFF.

Celsius to Fahrenheit Conversion Table

TEMPERATURE REFERENCE CHART

Panel

Item

Value

TR sensor

In-car Temperature

°C

TMA sensor Outside Air Temperature

°C

TS sensor

Solar Radiation Sensor Value: Dark=00, Flashlight=04, Cloudy=10,
Sunny=65

kcal/m

.min

TW sensor

Engine coolant Temperature

°C

TE sensor

Evaporator Outlet Air Temperature

°C

DrVENT
sensor

Driver's Vent Air Temperature

°C

PaVENT
sensor

Passenger's Vent Air Temperature

°C

DrA/M
motor

Driver's Air Mix Opening (Low value indicates cooler air distribution,
higher value indicates warmer air distribution)

% of opening

PaA/M
motor

Passenger's Air Mix Opening (Low value indicates cooler air
distribution, higher value indicates warmer air distribution)

% of opening

Mode motor Mode Opening

% of opening

R/F motor

Recirculation Opening

% of opening

DrC/V
sensor

Driver's Cool Vent Opening

% of opening

PaC/V
sensor

Passenger's Cool Vent Opening

% of opening

RrVENT
motor

Rear Vent Opening

% of opening

TAO

Vent Temperature Air Out (TAO)

°C

VSP

Vehicle Speed (Vehicle must be driven to display speed)

km/h

Pd sensor

A/C pressure

MPa

NOTE:



The sensor values will be displayed in degrees Celsius (°C) or an
alphanumeric code. Use the chart to convert the value to degrees
Fahrenheit (°F).



If the sensor value displays "Er" this indicates there is an open or
short in the circuit or sensor. Check for DTCs using the HDS, or
refer to checking DTCs by DTC indication.



If necessary, compare the sensor input display to a known-good
vehicle under the same test conditions.



If the sensor is out of the normal range, refer to the sensor test or
substitute a known-good sensor, and recheck.

°C

°F

°C

°F

°C

°F

°C

°F

°C

°F

104

106

2007 Acura RL

2005-08 HVAC HVAC - RL

Friday, June 05, 2009 2:25:42 PM

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