Acura RL. Manual - part 618

Fig. 7: Keyless/Power Door Locks/Security System - Circuit Diagram (5 Of 5) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

DTC TROUBLESHOOTING 

DTC B2179: DRIVER'S DOOR KEY CYLINDER SWITCH LOCK/UNLOCK SIGNAL ERROR 

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 ACCESSORIES AND EQUIPMENT Keyless/Power Door Locks/Security System - RL

  

me 

 

Friday, June 05, 2009 3:51:13 PM

Page 9 

© 2005 Mitchell Repair Information Company, LLC. 

1. Clear the DTCs with the HDS.  

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

3. Turn the driver's door key cylinder to the LOCK and UNLOCK positions with the ignition key.  

4. Check for DTCs with the HDS. 

Is DTC B2179 indicated?  

YES - Go to step 5. 

NO - Intermittent failure, the driver's door key cylinder switch system is OK at this time. Check for 
loose or poor connections. 

5. With the driver's door key cylinder switch in neutral position, select DOOR LOCK from the BODY 

ELECTRICAL SYSTEM SELECT menu, and enter the DATA LIST.  

6. Check the ON/OFF information of the Driver's Door Key Cylinder Switch (LOCK) and Driver's Door 

Key Cylinder Switch (UNLOCK) in the DATA LIST. 

Are both information indicators OFF?  

YES - Go to step 7. 

NO - Go to step 8. 

7. Turn the driver's door key cylinder to the LOCK and UNLOCK positions with the ignition key, and 

check the ON/OFF information of the Driver's Door Key Cylinder Switch (LOCK) and Driver's Door 
Key Cylinder Switch (UNLOCK) in the DATA LIST. 

Are both Driver's Door Key Cylinder Switch (LOCK) and Driver's Door Key Cylinder Switch 
(UNLOCK) information indicators ON at the same time with the door key cylinder switch in the 
LOCK or UNLOCK position?  

YES - Test the key cylinder switch (see DOOR LOCK SWITCH TEST ). If it is OK, repair short 
between the wires. 

NO - Replace the driver's MPCS unit. 

8. Disconnect the driver's door lock actuator 10P connector.  

9. Check the ON/OFF information of the Driver's Door Key Cylinder Switch (LOCK) and Driver's Door 

Key Cylinder Switch (UNLOCK) in the DATA LIST. 

Are both information indicators OFF?  

YES - Faulty driver's door key cylinder switch; replace the driver's door lock actuator assembly. 

NO - Go to step 10. 

10. Turn the ignition switch OFF.  

11. Disconnect driver's MPCS unit connector A (40P). 

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Keyless/Power Door Locks/Security System - RL

  

me 

 

Friday, June 05, 2009 3:51:13 PM

Page 10 

© 2005 Mitchell Repair Information Company, LLC. 

12. Check for continuity between body ground and the driver's door lock actuator 10P connector 

terminals No. 8 and No. 9 individually. 

Fig. 8: Checking Continuity Between Body Ground And Driver's Door Lock Actuator 
Terminals No. 8 And No. 9 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair a short to ground in the wire. 

NO - Replace the driver's MPCS unit. 

DTC B2180: DRIVER'S DOOR LOCK SWITCH LOCK/UNLOCK SIGNAL ERROR 

1. Clear the DTCs with the HDS.  

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

3. Lock and unlock the driver's door with the driver's door lock switch.  

4. Check for DTCs with the HDS. 

Is DTC B2180 indicated?  

YES - Go to step 5. 

NO - Intermittent failure, the driver's door lock switch system is OK at this time. Check for loose or 
poor connections. 

5. With the driver's door lock switch in the neutral position, select the DOOR LOCK from the BODY 

ELECTRICAL SYSTEM SELECT menu, and enter the DATA LIST.  

6. Check the ON/OFF Information of the Driver's Door Lock Switch (LOCK) and Driver's Door Lock 

Switch (UNLOCK). 

Are both information indicators OFF?

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 ACCESSORIES AND EQUIPMENT Keyless/Power Door Locks/Security System - RL

  

me 

 

Friday, June 05, 2009 3:51:13 PM

Page 11 

© 2005 Mitchell Repair Information Company, LLC. 

YES - Go to step 7. 

NO - Go to step 8. 

7. Operate the driver's door lock switch in the LOCK and UNLOCK positions, and check the ON/OFF 

information of the Driver's Door Lock Switch (LOCK) and Driver's Door LOCK Switch (UNLOCK). 

Are both Driver's Door LOCK Switch (LOCK) and Driver's Door LOCK Switch (UNLOCK) 
information indicators ON at the same time when the door lock switch is in the LOCK or UNLOCK 
position?  

YES - Repair short between the wires. 

NO - Replace the driver's MPCS unit. 

8. Disconnect the driver's door lock switch 4P connector.  

9. Check the ON/OFF information of the Driver's Side Remote Door Lock Switch (LOCK) and Driver's 

Side Remote Door Lock Switch (UNLOCK). 

Are both information indicators OFF?  

YES - Faulty driver's door lock switch; replace it. 

NO - Go to step 10. 

10. Turn the ignition switch OFF.  

11. Disconnect driver's MPCS unit connector A (40P).  

12. Check for continuity between body ground and the driver's door lock switch 4P connector terminals 

No. 3 and No. 4 individually. 

Fig. 9: Checking Continuity Between Body Ground And Driver's Door Lock Switch 4P 
Connector Terminals No. 3 And No. 4 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair a short to ground in the wire. 

NO - Replace the driver's MPCS unit.

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Keyless/Power Door Locks/Security System - RL

  

me 

 

Friday, June 05, 2009 3:51:13 PM

Page 12 

© 2005 Mitchell Repair Information Company, LLC.