2010 Acura Truck MDX V6-3.7L Page 299

NO -

Repair an open in the wire between the climate control unit and the audio unit (without navigation) or audio-navigation unit (with navigation).?

9. Check for continuity between climate control unit connector B (14P) terminal No. 8 and body ground.

Is there continuity?

YES -

Repair a short to body ground in the wire between the climate control unit and the audio unit (without navigation) or audio-navigation unit

(with navigation).?

NO -

Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit See:

Heating and Air Conditioning/Control Assembly/Service and Repair/Climate Control Unit Removal/Installation. If the symptom/indication remains,

substitute a known-good audio unit (without navigation) or audio-navigation unit (with navigation). If the symptom/indication goes away,

replace the original audio unit (without navigation) See: Accessories and Optional Equipment/Radio, Stereo, and Compact Disc/Service and

Repair/Audio Unit Removal/Installation or the original audio-navigation unit (with navigation) See: Accessories and Optional Equipment/Radio,

Stereo, and Compact Disc/Service and Repair/Audio-Navigation Unit Removal/Installation.?

2010 Acura Truck MDX V6-3.7L Page 184

NO -

Repair an open in the wire between the cable reel and the audio-navigation unit.?

With Navigation

DTC Troubleshooting: B1780

DTC B1780:

HandsFreeLink steering wheel switch line short (with navigation)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A See: Powertrain

Management/Computers and Control Systems/Information Bus/Testing and Inspection/Component Tests and General Diagnostics/Troubleshooting

- B-CAN System Diagnosis Test Mode A.

1. Connect the HDS to the DLC.

2. Clear the DTCs with the HDS.

3. Turn the ignition switch to LOCK (0), then start the engine and turn the steering wheel from lock to lock several times.

4. Check for DTCs with the HDS.

Is DTC B1780 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time.?

5. Turn the ignition switch to LOCK (0).

6. Do the HFL switch test See: Accessories and Optional Equipment/Cellular Phone/Testing and Inspection/Component Tests and General

Diagnostics/HFL Switch Test.

Is the switch OK?

YES -

Go to step 7.

NO -

Replace the HFL-navigation voice control switch See: Accessories and Optional Equipment/Sensors and Switches - Accessories and Optional

Equipment/Voice Activation Switch/Service and Repair.?

7. Disconnect the HandsFreeLink control unit 28P connector.

8. Disconnect the cable reel subharness 20P connector from the cable reel.

9. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 2 and body ground.

2010 Acura Truck MDX V6-3.7L Page 120

NO -

Go to step 12.

12. Turn the ignition switch to ON (II), and measure the voltage between climate control unit connector B (14P) terminal No. 5 and body ground.

Is there any voltage?

YES -

Repair a short to power in the wire between the climate control unit and the rear air mix control motor. This short may also damage the climate

control unit. Repair a short to power before replacing the climate control unit.?

NO -

Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit See:

Heating and Air Conditioning/Control Assembly/Service and Repair/Climate Control Unit Removal/Installation.?

13. Turn the ignition switch to LOCK (0), and disconnect climate control unit connector A (40P).

14. Disconnect these items:

- Driver's air mix control motor

- Passenger's air mix control motor

- Rear air mix control motor

- Humidity/in-car temperature sensor

- A/C pressure sensor

15. Check for continuity between climate control unit connector A (40P) terminal No. 6 and body ground.

Is there continuity?

YES -

Repair a short to body ground in the wire.?

NO -

Go to step 16.

16. Turn the ignition switch to ON (II), and measure the voltage between the same terminal and body ground.

2010 Acura Truck MDX V6-3.7L Page 291

NO -

Intermittent failure, check for a loose wire or poor connection in the climate control unit connector A (40P).?

6. Check for DTCs with the HDS.

Are any of the following DTCs indicated; B1005, B1959, B2162 or B1158 indicated?

YES -

Do the relay control module input test See: Power and Ground Distribution/Testing and Inspection/Relay Control Module Input Test.?

NO -

Do the climate control unit troubleshooting See: Heating and Air Conditioning/Control Assembly/Testing and Inspection.?

B2979

DTC Troubleshooting: B2979 (B and WINDSHIELD DEFROST)

DTC B2979 or DTC indicator B and WINDSHIELD DEFROST:

An Open in the A/C Pressure Sensor Circuit

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back to ON (II).

3. Do the self-diagnostic function with the HDS or the climate control unit.

4. Check for DTCs.

Is DTC B2979 or B and WINDSHIELD DEFROST indicated?

YES -

Go to step 5.

NO -

Intermittent failure, check for loose wires or poor connections in the A/C pressure sensor circuit.?

5. Turn the ignition switch to LOCK (0).

6. Disconnect the A/C pressure sensor 3P connector.

7. Disconnect climate control unit connector A (40P).

8. Check for continuity between the following terminals of climate control unit connector A (40P) and the A/C pressure sensor 3P connector.

2010 Acura Truck MDX V6-3.7L Page 193

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections between the power seat control unit and the driver's MPCS

unit.?

5. Check for DTCs with the HDS.

Are DTCs B1013, B1015, B1065, B1182, B1356, B1358, and B1905 also indicated?

YES -

Do the driver's MPCS unit input test See: Powertrain Management/Computers and Control Systems/Information Bus/Testing and

Inspection/Component Tests and General Diagnostics/Power Windows (Drivers MPCS Unit) Input Test.?

NO -

Do the power seat control unit input test See: Body and Frame/Relays and Modules - Body and Frame/Power Seat Control Module/Testing and

Inspection/Power Seat Control Unit Input Test.?

B1825

DTC Troubleshooting: B1825

DTC B1825:

Power Seat Slide Motor Pulse Error

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A See: Powertrain

Management/Computers and Control Systems/Information Bus/Testing and Inspection/Component Tests and General Diagnostics/Troubleshooting

- B-CAN System Diagnosis Test Mode A.

1. Turn the ignition switch to LOCK (0) and then back to ON (II).

2. Clear the DTCs with the HDS.

3. Operate the power seat adjustment switch in all directions for at least 6 seconds each.

4. Check for DTCs with the HDS.

Is DTC B1825 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the slide position sensor is OK at this time. Check for loose or poor connections at the power seat control unit connector.?

5. Check for DTCs with the HDS.

Is DTC B1836 also indicated?

YES -

Go to the DTC B1836 troubleshooting See: B1836.?

NO -

Go to step 6.

6. Check for DTCs with the HDS.

Are DTCs B1826, B1827 and/or B1828 also indicated?

2010 Acura Truck MDX V6-3.7L Page 150

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections between the power tailgate control unit and the tailgate

closer unit.?

6. Open the tailgate with the tailgate outer handle.

7. Turn the ignition switch to LOCK (0).

8. Turn the tailgate lock latch to the fully-closed position using a screwdriver.

9. Disconnect the 6P connector from the power tailgate closer unit.

10. Check for continuity between power tailgate closer unit 6P connector terminals No. 1 and No. 6.

Is there continuity?

YES -

Faulty release switch, replace the power tailgate closer unit.?

NO -

Go to step 11.

11. Check for continuity between power tailgate closer unit 6P connector terminal No. 6 and body ground.

Is there continuity?

YES -

Replace the power tailgate closer unit.?

NO -

Go to step 12.

12. Disconnect power tailgate control unit connector C (14P).

13. Check for continuity between power tailgate control unit connector C (14P) terminal No. 4 and body ground.

2010 Acura Truck MDX V6-3.7L Page 111

NO -

Intermittent failure, check for loose wires or poor connections in the mode control motor circuit.?

5. Turn the ignition switch to LOCK (0).

6. Test the front mode control motor See: Heating and Air Conditioning/Testing and Inspection/Component Tests and General

Diagnostics/Front Mode Control Motor Test.

Is the front mode control motor OK?

YES -

Go to step 7.

NO -

Replace the front mode control motor See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/Front Mode

Control Motor Replacement, or repair the front mode control linkage or doors.?

7. Disconnect the front mode control motor 7P connector.

8. Disconnect climate control unit connector A (40P).

9. Check for continuity between the following terminals of climate control unit connector A (40P) and the front mode control motor 7P

connector.

Is there continuity?

YES -

Go to step 10.

NO -

Repair an open in the wire(s) between the climate control unit and the front mode control motor.?

10. Check for continuity between body ground and climate control unit connector A (40P) terminals No. 16 and No. 17 individually.

2010 Acura Truck MDX V6-3.7L Page 68

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections between the gauge control module and the fuel tank unit.?

5. Turn the ignition switch to LOCK (0).

6. Disconnect the fuel tank unit 4P connector.

7. Clear the DTCs with the HDS.

8. Turn the ignition switch to LOCK (0), and then back to ON (II).

9. Wait for at least 30 seconds.

10. Check for DTCs with the HDS.

Is DTCs B1176 indicated?

YES -

Go to step 11.

NO -

Replace the fuel gauge sending unit.?

11. Disconnect gauge control module connector A (12P).

12. Check for continuity between gauge control module connector A (12P) terminal No. 11 and body ground.

Is there continuity?

YES -

Repair a short to ground in the wire between the gauge control module and the fuel tank unit.?

NO -

Replace the gauge control module.?

B1178

DTC Troubleshooting: B1168, B1169, B1178

DTC B1168:

Gauge Control Module Lost Communication with PCM (ENG Message)

DTC B1169:

Gauge Control Module Lost Communication with PCM (A/T Message)

DTC B1178:

F-CAN Communication Line Error

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A See: Powertrain

Management/Computers and Control Systems/Information Bus/Testing and Inspection/Component Tests and General Diagnostics/Troubleshooting

- B-CAN System Diagnosis Test Mode A.

2010 Acura Truck MDX V6-3.7L Page 56

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections between the gauge control module and the combination

switch control unit.?

5. Check for DTCs with the HDS.

Are DTCs B1007, B1062, B1063, B1957, B1958, and/or B2969 also indicated?

YES -

Do the combination switch control unit input test See: Wiper and Washer Systems/Testing and Inspection/Wiper/Washer Switch (Combination

Switch Control Unit) Input Test.?

NO -

Do the gauge control module input test See: Instrument Panel, Gauges and Warning Indicators/Testing and Inspection/Component Tests and

General Diagnostics/Gauge Control Module Input Test.?

B1156

DTC Troubleshooting: B1155, B1156

DTC B1155:

Gauge Control Module Lost Communication with Combination Switch Control Unit (HLSW Message)

DTC B1156:

Gauge Control Module Lost Communication with Combination Switch Control Unit (WIPSW Message)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A See: Powertrain

Management/Computers and Control Systems/Information Bus/Testing and Inspection/Component Tests and General Diagnostics/Troubleshooting

- B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0), and then back to ON (II).

3. Wait for at least 6 seconds.

4. Check for DTCs with the HDS.

Is DTC B1155 and/or B1156 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections between the gauge control module and the combination

switch control unit.?

5. Check for DTCs with the HDS.

Are DTCs B1007, B1062, B1063, B1957, B1958, and/or B2969 also indicated?

YES -

Do the combination switch control unit input test See: Wiper and Washer Systems/Testing and Inspection/Wiper/Washer Switch (Combination

Switch Control Unit) Input Test.?

NO -

Do the gauge control module input test See: Instrument Panel, Gauges and Warning Indicators/Testing and Inspection/Component Tests and

General Diagnostics/Gauge Control Module Input Test.?

B1157

DTC Troubleshooting: B1157, B1159, B1180

2010 Acura Truck MDX V6-3.7L Page 107

NO -

Replace the driver's air mix control motor See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/Driver's Air

Mix Control Motor Replacement, or repair the driver's air mix control linkage or door.?

7. Disconnect the driver's air mix control motor 7P connector.

8. Disconnect climate control unit connector A (40P).

9. Check for continuity between the following terminals of climate control unit connector A (40P) and the driver's air mix control motor 7P

connector.

Is there continuity?

YES -

Go to step 10.

NO -

Repair an open in the wire(s) between the climate control unit and the driver's air mix control motor.?

10. Check for continuity between body ground and climate control unit connector A (40P) terminals No. 12 and No. 13 individually.

Is there continuity?

YES -

Repair a short to body ground in the wire(s) between the climate control unit and the driver's air mix control motor.?

NO -

Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit See:

Heating and Air Conditioning/Control Assembly/Service and Repair/Climate Control Unit Removal/Installation.?

B1239

DTC Troubleshooting: B1239 (A and MODE)

DTC B1239 or DTC indicator A and MODE:

2010 Acura Truck MDX V6-3.7L Page 297

NO -

Replace the recirculation control motor See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/Recirculation

Control Motor Replacement, or repair the recirculation control linkage or door.?

7. Disconnect the recirculation control motor 7P connector.

8. Disconnect climate control unit connector A (40P).

9. Check for continuity between the following terminals of climate control unit connector A (40P) and the recirculation control motor 7P

connector.

Is there continuity?

YES -

Go to step 10.

NO -

Repair an open in the wire(s) between the climate control unit and the recirculation control motor.?

10. Check for continuity between body ground and climate control unit connector A (40P) terminals No. 18 and No. 19 individually.

Is there continuity?

YES -

Repair a short to body ground in the wire(s) between the climate control unit and the recirculation control motor.?

NO -

Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit See:

Heating and Air Conditioning/Control Assembly/Service and Repair/Climate Control Unit Removal/Installation.?

B2991

DTC Troubleshooting: B2991

2010 Acura Truck MDX V6-3.7L Page 242

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections between the rear fuse/relay box and the MICU.?

5. Check for DTCs with the HDS.

Are DTCs B1055, B1157, B1255, B1355, B1806, B1955, and/or B2155, indicated?

YES -

Do the MICU input test See: Powertrain Management/Computers and Control Systems/Information Bus/Testing and Inspection/Component Tests

and General Diagnostics/MICU Input Test.?

NO -

Do the rear MICU input test See: Powertrain Management/Computers and Control Systems/Information Bus/Testing and Inspection/Component

Tests and General Diagnostics/Rear MICU Input Test.?

B1956

DTC Troubleshooting: B1956

DTC B1956:

Rear MICU Lost Communication with Gauge Control Module (A/T Message)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A See: Powertrain

Management/Computers and Control Systems/Information Bus/Testing and Inspection/Component Tests and General Diagnostics/Troubleshooting

- B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back to ON (II).

3. Wait for at least 6 seconds.

4. Check for DTCs with the HDS.

Is DTC B1956 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections between the rear MICU and the gauge control module.?

5. Check for DTCs with the HDS.

Are DTCs B1061, B1359, B1808, B1906, and U0155 also indicated?

YES -

Do the gauge control module input test See: Instrument Panel, Gauges and Warning Indicators/Testing and Inspection/Component Tests and

General Diagnostics/Gauge Control Module Input Test.?

NO -

Do the rear MICU input test See: Powertrain Management/Computers and Control Systems/Information Bus/Testing and Inspection/Component

Tests and General Diagnostics/Rear MICU Input Test.?

B1957

DTC Troubleshooting: B1957, B1958

DTC B1957:

Rear MICU Lost Communication with Combination Switch Control Unit (HLSW Message)

2010 Acura Truck MDX V6-3.7L Page 91

NO -

Intermittent failure, check for loose wires or poor connections in the in-car temperature sensor circuit.?

5. Turn the ignition switch to LOCK (0).

6. Remove the humidity/in-car temperature sensor See: Heating and Air Conditioning/Cabin Temperature Sensor / Switch/Service and Repair,

and test it.

Is the in-car temperature sensor OK?

YES -

With the humidity/in-car temperature sensor disconnected, go to step 7.

NO -

Replace the humidity/in-car temperature sensor See: Heating and Air Conditioning/Cabin Temperature Sensor / Switch/Service and Repair.?

7. Disconnect climate control unit connector A (40P).

8. Check for continuity between climate control unit connector A (40P) terminal No. 5 and humidity/in-car temperature sensor 4P connector

terminal No. 4.

Is there continuity?

YES -

Go to step 9.

NO -

Repair an open in the wire between the climate control unit and the in-car temperature sensor.?

9. Check for continuity between climate control unit connector A (40P) terminal No. 8 and humidity/in-car temperature sensor 4P connector

2010 Acura Truck MDX V6-3.7L Page 161

NO -

Repair an open in the wire.?

B1387

DTC Troubleshooting: B1387

DTC B1387:

Power Tailgate Sensor Pulse B Circuit Malfunction

NOTE: If the motor does not operate, do the power tailgate motor test See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Testing and

Inspection/Component Tests and General Diagnostics/Power Tailgate Motor Test.

1. Open the tailgate with the tailgate outer handle.

2. Close the tailgate automatically with the keyless transmitter or inside tailgate switch.

3. Turn the ignition switch to LOCK (0) and then back to ON (II).

4. Clear the DTCs with the HDS.

5. Check for DTCs with the HDS.

Is DTC B1387 indicated?

YES -

Go to step 6.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections between the power tailgate control unit and the drive unit.?

6. Turn the ignition switch to LOCK (0).

7. Connect the voltmeter to the power tailgate control unit B connector (20P) terminals No. 15 and No. 18.

8. Measure the voltage between power tailgate control unit connector B (20P) terminals No. 15 and No. 18 while the tailgate is opening and

closing with the keyless transmitter or inside tailgate switch.

Does it alternate between about 0 V and 5 V with an analog voltmeter, or is about 2.5 V indicated with a digital voltmeter?

YES -

Replace the power tailgate control unit.?

NO -

Go to step 9.

9. Disconnect power tailgate control unit connector B (20P).

10. Disconnect drive unit connector B (8P).

11. Check for continuity between power tailgate control unit connector B (20P) terminal No. 15 and body ground.