Acura RL. Manual - part 736

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

TEST CONDITION AND POSSIBLE CAUSE REFERENCE CHART 

B1

LTGRN

Connect the B8 and B1 
terminals with a jumper 
wire, and connect the B7 
terminal to body ground.

Check the driver's power window 
motor operation: 
The motor should run (the window 
should go down).

driver's under-
dash fuse/relay 
box  



Faulty driver's 
power window 
motor  



An open in the 
wire  

B7

BLU

Connect the B8 and B7 
terminals with a jumper 
wire, and connect the B1 
terminal to body ground.

Check the driver's power window 
motor operation: 
The motor should run (the window 
should go up).



Blown No. 27 
(30A) fuse in the 
driver's under-
dash fuse/relay 
box  



Faulty driver's 
power window 
motor  



An open 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 
(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  

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 

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Power Windows - RL

  

me 

 

Friday, June 05, 2009 3:20:28 PM

Page 48 

© 2005 Mitchell Repair Information Company, LLC. 

under-dash 
fuse/relay box  



An open in the 
wire  

B8

WHT Under all conditions

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



Blown No. 23 
(P/W) (50A) fuse 
in the under-hood 
fuse/relay box  



Blown No. 27 
(30A) fuse in the 
driver's under-
dash fuse/relay 
box  



Faulty driver's 
under-dash 
fuse/relay box  



An open in the 
wire  

A25

YEL Ignition switch ON (II)

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



Blown No. 21 
(10A) fuse in the 
driver's under-
dash fuse/relay 
box  



Faulty driver's 
under-dash 
fuse/relay box  



An open in the 
wire  

B9

LT 

GRN

Ignition switch ON (II)

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



Faulty driver's 
MPCS unit  



Faulty power 
window master 
switch  



A short to ground 
in the wire  

B3

RED Ignition switch ON (II)

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



Faulty driver's 
MPCS unit  



An open in the 
wire  

B6

GRN Under all conditions

Measure the continuity to 
ground: 
There should be 
continuity.



Poor ground 
(G601)  



Faulty driver's 
MPCS unit  



An open in the 
wire  

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Power Windows - RL

  

me 

 

Friday, June 05, 2009 3:20:28 PM

Page 49 

© 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 (A) connectors A (28P) and B (14P). 

B5

GRY

Ignition switch ON (II) and 
driver's power window motor runs 
by connecting the B8 and B1 
terminals with a jumper wire, and 
connect the B7 terminal to body 
ground.

Measure the voltage 
between the B5 and B6 
terminals: 
There should be 0-about 5 
V-0- about 5 V repeatedly 
(a digital voltmeter reads 
about 2.5 V while the 
window moves).



Blown No. 27 
(30A) fuse in the 
driver's under-
dash fuse/relay 
box  



Faulty driver's 
MPCS unit  



Faulty driver's 
power window 
motor  



An open in the 
wire  

B4

BRN

Ignition switch ON (II) and 
driver's power window motor runs 
by connecting the B8 and B1 
terminals with a jumper wire, and 
connect the B7 terminal to body 
ground.

Measure the voltage 
between the B4 and B6 
terminals: 
There should be 0-about 5 
V-0- about 5 V repeatedly 
(a digital voltmeter reads 
about 2.5 V while the 
window moves).



Blown No. 27 
(30A) fuse in the 
driver's under-
dash fuse/relay 
box  



Faulty driver's 
MPCS unit  



Faulty driver's 
power window 
motor  



An open in the 
wire  

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Power Windows - RL

  

me 

 

Friday, June 05, 2009 3:20:28 PM

Page 50 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 49: Identifying Front Passenger's MPCS Unit Connectors (28P) And (14P) 
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 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 6.  

TEST CONDITION AND POSSIBLE CAUSE REFERENCE CHART 

Cavity Wire

Test condition

Test: Desired result

Possible cause if 

desired result is not 

 

2007 Acura RL 

2005-08 ACCESSORIES AND EQUIPMENT Power Windows - RL

  

me 

 

Friday, June 05, 2009 3:20:28 PM

Page 51 

© 2005 Mitchell Repair Information Company, LLC.