Acura RL. Manual - part 621

Front Passenger's MPCS Unit  

12. Turn the ignition switch OFF, and remove the front passenger's door panel (see FRONT DOOR 

PANEL REMOVAL/INSTALLATION ).  

13. Disconnect passenger's MPCS unit connectors A (28P) and B (14P). 

about 5 V.

A3

GRN

Driver's door open

Measure the 
voltage to ground:
There should be 
less than 1 V.



Poor ground (G601)  



Faulty driver's door switch  



An open in the wire  

Driver's door closed

Measure the 
voltage to ground:
There should be 
about 5 V.



Faulty driver's door switch  



A short to ground in the wire  

A6

BRN

Left rear door lock knob 
switch in UNLOCK

Measure the 
voltage to ground:
There should be 
less than 1 V.



Poor ground (G602)  



Faulty left rear door switch  



An open in the wire  

Left rear door lock knob 

switch in LOCK

Measure the 
voltage to ground:
There should be 
about 5 V.



Faulty left rear door switch  



A short to around in the wire  

A21

BLU

Driver's door key cylinder 
switch in UNLOCK

Measure the 
voltage to ground:
There should be 
less than 1 V.



Poor ground (G601)  



Faulty driver's door key cylinder 
switch  



An open in the wire  

Driver's door key cylinder 

switch in neutral

Measure the 
voltage to ground:
There should be 
about 5 V.



Faulty driver's door key cylinder 
switch  



A short to ground in the wire  

Driver's door key cylinder 
switch in LOCK

Measure the 
voltage to ground:
There should be 
about 5 V.



Faulty driver's door key cylinder 
switch  



A short to ground in the wire  

A22

LT 

BLU

Driver's door key cylinder 
switch in LOCK

Measure the 
voltage to ground:
There should be 
less than 1 V.



Poor ground (G601)  



Faulty driver's door key cylinder 
switch  



An open in the wire  

Driver's door key cylinder 

switch in neutral

Measure the 
voltage to ground:
There should be 
about 5 V.



Faulty driver's door key cylinder 
switch  



A short to ground in the wire  

Driver's door key cylinder 
switch in UNLOCK

Measure the 
voltage to ground:
There should be 
about 5 V.



Faulty driver's door key cylinder 
switch  



A short to ground in the wire  

 

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 21 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 14: Identifying Passenger's MPCS Unit 28P And 14P Connectors 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

14. Inspect the connector and socket terminals to be sure they are all making good contact. 



If the terminals are bent, loose or corroded, repair them as necessary and recheck the system.  



If the terminals look OK, go to step 15.  

15. With the connectors still disconnected, make these input tests at the connectors. 



If any test indicates a problem, find and correct the cause, then recheck the system.  



If all the input tests prove OK, go to step 16.  

WIRE CAVITY REFERENCE CHART 

Cavity Wire

Test condition

Test: Desired result

Possible cause if desired 

result is not obtained

A15

PNK

Front passenger's door lock 
switch in LOCK

Check for continuity 
between the terminals: 
There should be 
continuity.



Faulty front passenger's 
door lock switch  



An open in the wire  

A20

LT 

BLU

A15

PNK

Front passenger's door lock 
switch in neutral or UNLOCK

Check for continuity 
between the terminals: 
There should be no 
continuity.



Faulty front passenger's 
door lock switch  



A short to ground in the 
wire  

A20

LT 

BLU

A16

BRN

Front passenger's door lock 
switch in UNLOCK

Check for continuity 
between the terminals: 
There should be 
continuity.



Faulty front passenger's 
door lock switch  



An open in the wire  

A20

LT 

BLU

A16

BRN

Front passenger's door lock 
switch in neutral or LOCK

Check for continuity 
between the terminals: 
There should be no 
continuity.



Faulty front passenger's 
door lock switch  



A short to ground in the 
wire  

A20

LT 

BLU

 

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 22 

© 2005 Mitchell Repair Information Company, LLC. 

16. Reconnect the connectors to the front passenger's MPCS unit, and make these input tests at the 

connectors. 



If any test indicates a problem, find and correct the cause, then recheck the system.  



If all the input tests prove OK, go to step 17.  

WIRE CAVITY REFERENCE CHART 

A9

YEL

Under all conditions

Check for continuity 
between the terminals: 
There should be 
continuity.



Faulty front passenger's 
door lock switch  



Blown bulb  



An open in the wire  

A20

LT 

BLU

Cavity Wire

Test condition

Test: Desired 

result

Possible cause if desired result is not 

obtained

A7

BLK Under all conditions

Measure the 
voltage to 
ground: 
There should be 
less than 0.5 V.



Poor ground (G601)  



An open in the wire  

B14

BLK Under all conditions

Measure the 
voltage to 
ground: 
There should be 
less than 0.5 V.



Poor ground (G601)  



An open in the wire  

A2

WHT Under all conditions

Measure the 
voltage to 
ground: 
There should be 
battery voltage.



Blown No. 15 (40A) fuse in the 
under-hood fuse/relay box  



Blown No. 7(10A) fuse in the 
driver's under-dash fuse/relay 
box  



An open in the wire  

A17

GRN

Front passenger's door lock 
knob switch in UNLOCK

Measure the 
voltage to 
ground: 
There should be 
less than 1 V.



Poor ground(G506)  



Faulty front passenger's door 
lock knob switch  



An open in the wire  

Front passenger's door lock 

knob switch in LOCK

Measure the 
voltage to 
ground: 
There should be 5 
V or more.



Faulty front passenger's door 
lock knob switch  



A short to ground in the wire  

A26

BRN

Right rear door lock knob 
switch in LOCK

Measure the 
voltage to 
ground: 
There should be 
less than 1 V.



Poor ground(G651)  



Faulty right rear door lock knob 
switch ? An open in the wire  

Right rear door lock knob 

switch in UNLOCK

Measure the 
voltage to 
ground: 



Faulty right rear door lock knob 
switch  

 

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 23 

© 2005 Mitchell Repair Information Company, LLC. 

Left Rear Power Window Switch  

17. Turn the ignition switch OFF, and remove the left rear power window switch (see POWER 

WINDOW MASTER SWITCH REPLACEMENT ).  

18. Disconnect the rear power window switch 14P connector. 

Fig. 15: Identifying Rear Power Window Switch 14P Connector 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

19. Inspect the connector and socket terminals to be sure they are all making good contact. 



If the terminals are bent, loose or corroded, repair them as necessary and recheck the system.  



If the terminals look OK, go to step 20.  

20. Reconnect the connector to the switch, and make these input tests at the connector. 



If any test indicates a problem, find and correct the cause, then recheck the system.  



If all the input tests prove OK, go to step 21.  

WIRE CAVITY REFERENCE CHART 

There should be 5 
V or more.



A short to ground in the wire  

A28

LT 

GRN

Front passenger's door open

Measure the 
voltage to 
ground: 
There should be 
less than 1 V.



Poor ground (G506)  



Faulty front passenger's door 
switch  



An open in the wire  

Front passenger's door 

closed

Measure the 
voltage to 
ground: 
There should be 5 
V or more.



Faulty front passenger's door 
switch  



A short to ground in the wire  

Cavity Wire Test condition Test: Desired result

Possible cause if desired result is not 

obtained

6

BLK

Under all 
conditions

Measure the voltage 
to ground: 
There should be less 
than 0.5 V.



Poor ground(G602)  



An open in the wire  

Measure the voltage 

 

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 24 

© 2005 Mitchell Repair Information Company, LLC.