Acura RL. Manual - part 602

Fig. 13: Identifying Driver's MPCS Unit 40P Connector 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

4. 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 5.  

5. With the connector still disconnected, 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 6. 

WIRE CAVITY REFERENCE CHART 

Cavity Wire

Test condition

Test: Desired result

Possible cause if 

desired result is 

not obtained

A4

RED

Connect the A7 and A27 
terminals with a jumper 
wire.

Attach to ground: The driver's 
door pocket light should come 
on.



Faulty 
driver's door 
pocket light  



An open in 
the wire  

A15 PNK

Connect the A7 and A27 
terminals with a jumper 
wire.

Attach to ground: The driver's 
door courtesy light should 
come on.



Faulty 
driver's door 
courtesy light 



An open in 
the wire  

A36 RED

Connect the A7 and A27 
terminals with a jumper 
wire.

Attach to ground: The driver's 
door inner handle light should 
come on.



Faulty 
driver's door 
inner handle 
light  



An open in 
the wire  

A37 PUR

Connect the A7 and A37 
terminals with a jumper 
wire.

Check the driver's door outer 
handle light: The light should 
come on.



Faulty 
driver's door 
outer handle 
light  



Poor ground 
(G601)  

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Interior Lights - RL

  

me 

 

Friday, June 05, 2009 3:31:24 PM

Page 15 

© 2005 Mitchell Repair Information Company, LLC. 

6. Reconnect the connector to the driver's MPCS unit, 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, the control unit must be faulty; replace the driver's MPCS unit 
and go to step 7. 

WIRE CAVITY REFERENCE CHART 



An open in 
the wire  

A8

GRY

Driver's under-dash 
fuse/relay box connector H 
(14P) and power window 
master switch 6P connector 
disconnected

Check for continuity between 
the A8 terminal and driver's 
under-dash fuse/relay box 
connector H (14P) No. 4 
terminal: There should be 
continuity.

An open in the wire

Check for continuity to ground: 

There should be no continuity.

A short to ground 
in the wire

Cavity Wire

Test 

condition

Test: Desired result

Possible cause if desired result is 

not obtained

A5

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  

A7

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  



Faulty driver's under-dash 
fuse/relay box  



An open in the wire  

A3

GRN

Driver's door 
open

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



Faulty driver's door switch  



An open in the wire  

Driver's door 

closed

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



Faulty driver's door switch  



A short to ground in the wire 

A26

LT 

BLU

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  



Faulty driver's under-dash 
fuse/relay box  



An open in the wire  

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Interior Lights - RL

  

me 

 

Friday, June 05, 2009 3:31:24 PM

Page 16 

© 2005 Mitchell Repair Information Company, LLC. 

7. Reset the power window control unit (see RESETTING THE POWER WINDOW CONTROL 

UNIT ).  

FRONT PASSENGER'S MPCS UNIT INPUT TEST 

1. Turn the ignition switch OFF.  

2. Remove the front passenger's door panel (see FRONT DOOR PANEL 

REMOVAL/INSTALLATION ).  

3. Disconnect front passenger's MPCS unit connector A (28P). 

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

4. 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 5.  

5. With the connector still disconnected, 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 6. 

WIRE CAVITY REFERENCE CHART 

A27 LTBLU

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  



Faulty driver's under-dash 
fuse/relay box  



An open in the wire  

Cavity Wire

Test condition

Test: Desired result

Possible cause if 

desired result is not 

obtained



Faulty front 
passenger's 

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Interior Lights - RL

  

me 

 

Friday, June 05, 2009 3:31:24 PM

Page 17 

© 2005 Mitchell Repair Information Company, LLC. 

6. Reconnect the connector to the front passenger's MPCS unit, 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, the control unit must be faulty; replace the front passenger's 
MPCS unit and go to step 7. 

WIRE CAVITY REFERENCE CHART 

A8

PNK

Connect the A2 and A19 
terminals with a jumper 
wire.

Attach to ground: The front 
passenger's door pocket light 
should come on.

door pocket 
light  



An open in the 
wire  

A9

YEL

Connect the A2 and A19 
terminals with a jumper 
wire.

Attach to ground: The front 
passenger's door courtesy 
light should come on.



Faulty front 
passenger's 
door courtesy 
light  



An open in the 
wire  

A21 ORN

Connect the A2 and A19 
terminals with a jumper 
wire.

Attach to ground: The front 
passenger's door inner handle 
light should come on.



Faulty front 
passenger's 
door inner 
handle light  



An open in the 
wire  

A23 RED

Connect the A2 and A23 
terminals with a jumper 
wire.

Check the front passenger's 
door outer handle light: The 
front passenger's door outer 
handle light should come on.



Faulty front 
passenger's 
door outer 
handle light  



Poor ground
(G506)  



An open in the 
wire  

A4

GRY

Driver's under-dash 
fuse/relay box connector X 
(39P) and right rear power 
window switch 14P 
connector disconnected

Check for continuity between 
the A4 terminal and driver's 
under-dash fuse/relay box 
connector X (39P) No. 15 
terminal: There should be 
continuity.



Faulty 
passenger's 
under-dash 
fuse/relay box  



An open in the 
wire  

Check for continuity to 

ground: There should be no 

continuity.



Faulty 
passenger's 
under-dash 
fuse/relay box  



A short to 
ground in the 
wire  

Possible cause if desired result is 

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Interior Lights - RL

  

me 

 

Friday, June 05, 2009 3:31:24 PM

Page 18 

© 2005 Mitchell Repair Information Company, LLC.