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Acura RL. Manual - part 562

1. Clear the DTC with the HDS.

2. Turn the ignition switch OFF and then ON (II).

3. Wait for 6 seconds or more.

4. Do the self-diagnostic with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION

WITH THE HDS ) or climate control unit (see HOW TO USE THE SELF-DIAGNOSTIC
FUNCTION WITHOUT HDS ).

5. Check for DTCs.

Is DTC B1202 or EEPROM error indicated?

YES - The climate control unit is faulty, replace the climate control unit.

NO - Intermittent failure, the climate control unit is OK at this time.

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)

1. Clear the DTC with the HDS.

2. Turn the ignition switch OFF and then ON (II).

3. Wait for 6 seconds or more.

4. Do the self-diagnostic with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION

WITH THE HDS ) or climate control unit (see HOW TO USE THE SELF-DIAGNOSTIC
FUNCTION WITHOUT HDS ).

5. Check for DTCs.

Is DTC B1205 or Vehicle speed error/ENGNe error, and/or B1206 or TW sensor error, and/or
B1207, and/or B1208 indicated?

YES - Go to step 6.

NO - Intermittent failure, check for loose wires or poor connections on the gauge control module
circuit.

6. Clear for DTC using the HDS.

Is DTC B1011, B1060, B1408, B1610, B1805 and/or B2160, and/or B1207 indicated?

YES - Go to the gauge control module input test (see GAUGE CONTROL MODULE INPUT
TEST ).

TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

NOTE:

If you are troubleshooting multiple DTCs, be sure to follow the instructions
in B-CAN system diagnosis test mode A (see TROUBLESHOOTING - B-CAN
SYSTEM DIAGNOSIS TEST MODE A ).

2007 Acura RL

2005-08 HVAC HVAC - RL

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

Page 31

NO - The climate control unit is faulty, replace the climate control unit.

DTC B1225 or TR sensor open is indicated: An Open in the In-car Temperature Sensor Circuit

1. Clear the DTC with the HDS.

2. Turn the ignition switch OFF and then ON (II).

3. Do the self-diagnostic with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION

WITH THE HDS ) or climate control unit (see HOW TO USE THE SELF-DIAGNOSTIC
FUNCTION WITHOUT HDS ).

4. Check for DTCs.

Is DTC B1225 or TR sensor open indicated?

YES - Go to step 5.

NO - Intermittent failure, check for loose wires or poor connections on the in-car temperature sensor
circuit.

5. Turn the ignition switch OFF.

6. Remove the in-car temperature sensor (see IN-CAR TEMPERATURE SENSOR TEST ) and test it

(see IN-CAR TEMPERATURE SENSOR TEST ).

Is the in-car temperature sensor OK?

YES - Go to step 7.

NO - Replace the in-car temperature sensor.

7. Disconnect the climate control unit 40P connector.

8. Check for continuity between the climate control unit 40P connector No. 15 terminal and the in-car

temperature sensor 4P connector No. 3 terminal.

Fig. 24: Checking Continuity Between Climate Control Unit 40P Connector 15 Terminal And
In-Car Temperature Sensor 4P Connector 3 Terminal
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

2007 Acura RL

2005-08 HVAC HVAC - RL

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

Page 32

YES - Go to step 9.

NO - Repair open in the wire between the climate control unit and the in-car temperature sensor.

9. Check for continuity between the climate control unit 40P connector No. 33 terminal and the in-car

temperature sensor 4P connector No. 2 terminal.

Fig. 25: Checking Continuity Between Climate Control Unit 40P Connector 33 Terminal And
In-Car Temperature Sensor 4P 2 Terminal
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Check for loose wires or poor connections at the climate control unit 40P connector and at the
in-car temperature sensor 4P connector. If the connections are good, substitute a known-good climate
control unit, and recheck. If the symptom/ indication goes away, replace the original climate control
unit.

NO - Repair open in the wire between the climate control unit and the in-car temperature sensor.

DTC B1226 or TR sensor short is indicated: A Short in the In-car Temperature Sensor Circuit

1. Clear the DTC with the HDS.

2. Turn the ignition switch OFF and then ON (II).

3. Do the self-diagnostic with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION

WITH THE HDS ) or climate control unit (see HOW TO USE THE SELF-DIAGNOSTIC
FUNCTION WITHOUT HDS ).

4. Check for DTCs.

Is DTC B1226 or TR sensor short indicated?

YES - Go to step 5.

NO - Intermittent failure.

5. Turn the ignition switch OFF.

6. Remove the in-car temperature sensor (see IN-CAR TEMPERATURE SENSOR

REPLACEMENT ) and test it (see IN-CAR TEMPERATURE SENSOR TEST ).

2007 Acura RL

2005-08 HVAC HVAC - RL

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Page 33

Is the in-car temperature sensor OK?

YES - Go to step 7.

NO - Replace the in-car temperature sensor.

7. Disconnect the climate control unit 40P connector.

8. Check for continuity between body ground and the climate control unit 40P connector No. 15

terminal.

Fig. 26: Checking Continuity Between Body Ground And Climate Control Unit 40P Connector
15 Terminal
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short to body ground in the wire between the climate control unit and the in-car
temperature sensor.

NO - Go to step 9.

9. Check for continuity between the climate control unit 40P connector No. 15 and No. 33 terminals.

Fig. 27: Checking Continuity Between Climate Control Unit 40P Connector 15 And 33
Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

2007 Acura RL

2005-08 HVAC HVAC - RL

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

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