Driving Position Memory System (Door Multiplex Control Unit and Power Seat Control Unit) Input Test
NOTE:
Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.
SRS components are located in this area. Review the SRS component locations, and precautions and procedures before doing repairs or servicing.
Before testing, make sure the No. A2-2 (60 A) and No. A29 (10 A) fuse in the under-hood fuse/relay box are OK.
Before testing, make sure the No. B5 (10 A), No. B16 (20 A), No. B17 (20 A), No. B22 (7.5 A), and No. B42 (20 A) fuses in the under-dash fuse/relay box are OK.

Power seat control unit

1.
Turn the vehicle to the OFF (LOCK) mode.

2.
Disconnect the following connectors.

Power seat control unit connector A (18P)
Power seat control unit connector B (40P)

NOTE: All connector views are shown from the wire side of the female terminals.
3.
Inspect the connectors 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 4.

4.
Reconnect the connectors to the power seat control unit, and do the following input tests:
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.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
B27
BRN
Vehicle ON mode
Measure the voltage to ground:
There should be battery voltage.
Blown No. B5 (10 A) fuse in the under-dash fuse/relay box
An open or high resistance in the wire
B25
WHT
Under all conditions
Measure the voltage to ground:
There should be battery voltage.
Blown No. A29 (10 A) fuse in the under-hood fuse/relay box
Faulty under-dash fuse/relay box
An open or high resistance in the wire
A1
LT BLU
Under all conditions
Measure the voltage to ground:
There should be battery voltage.
Blown No. B16 (20 A) fuse in the under-dash fuse/relay box
An open or high resistance in the wire
A8
RED
Under all conditions
Measure the voltage to ground:
There should be battery voltage.
Blown No. B17 (20 A) fuse in the under-dash fuse/relay box
An open or high resistance in the wire
A5
BRN
In all power modes
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G601)
An open or high resistance in the ground wire
A9
BRN
In all power modes
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G601)
An open or high resistance in the ground wire
B12
BLK
In all power modes
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G601)
An open or high resistance in the ground wire
B35
GRN
Shift lever in P position
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty transmission range switch
Poor ground (G101) or an open in the ground wire
Shift lever in any position other than P
Measure the voltage to ground:
There should be at least about 10 V.
Faulty transmission range switch
A short to ground in the wire
B6
BLU
Vehicle ON mode
Measure the voltage to ground:
There should be at least about 10 V.
Faulty position sensor
A short to ground in the wire
B11
?
B32
GRN
?
PUR
Run the recline motor
Measure the voltage between terminals B11 (?) and B32 (?):
There should be about 2.5 V average.
Faulty position sensor
An open or high resistance in the wire
A short to ground in the wire
B10
?
B32
WHT
?
PUR
Run the slide motor
Measure the voltage between terminals B10 (?) and B32 (?):
There should be about 2.5 V average.
Faulty position sensor
An open or high resistance in the wire
A short to ground in the wire
B9
?
B32
RED
?
PUR
Run the front up-down motor
Measure the voltage between terminals B9 (?) and B32 (?):
There should be about 2.5 V average.
Faulty position sensor
An open or high resistance in the wire
A short to ground in the wire
B8
?
B32
YEL
?
PUR
Run the rear up-down motor
Measure the voltage between terminals B8 (?) and B32 (?):
There should be about 2.5 V average.
Faulty position sensor
An open or high resistance in the wire
A short to ground in the wire
B14
?
B20
BLU
?
BLU
Slide switch to the FORWARD position
Measure the voltage between terminals B14 and B20:
There should be about 5 V.
Faulty driver's power seat adjustment switch
An open or high resistance in the wire
Slide switch to the BACKWARD position
Measure the voltage between terminals B14 and B20:
There should be less than 0.2 V.
Faulty driver's power seat adjustment switch
A short to ground in the wire
B37
?
B20
LT GRN
?
BLU
Slide switch to the BACKWARD position
Measure the voltage between terminals B37 and B20:
There should be about 5 V.
Faulty driver's power seat adjustment switch
An open or high resistance in the wire
Slide switch to the FORWARD position
Measure the voltage between terminals B37 and B20:
There should be less than 0.2 V.
Faulty driver's power seat adjustment switch
A short to ground in the wire
B15
?
B20
LT BLU
?
BLU
Recline switch to the FORWARD position
Measure the voltage between terminals B15 and B20:
There should be about 5 V.
Faulty driver's power seat adjustment switch
An open or high resistance in the wire
Recline switch to the BACKWARD position
Measure the voltage between terminals B15 and B20:
There should be less than 0.2 V.
Faulty driver's power seat adjustment switch
A short to ground in the wire
B38
?
B20
GRN
?
BLU
Recline switch to the BACKWARD position
Measure the voltage between terminals B38 and B20:
There should be about 5 V.
Faulty driver's power seat adjustment switch
An open or high resistance in the wire
Recline switch to the FORWARD position
Measure the voltage between terminals B38 and B20:
There should be less than 0.2 V.
Faulty driver's power seat adjustment switch
A short to ground in the wire
B16
?
B20
RED
?
BLU
Front up-down switch in UP position
Measure the voltage between terminals B16 and B20:
There should be about 5 V.
Faulty driver's power seat adjustment switch
An open or high resistance in the wire
Front up-down switch in DOWN position
Measure the voltage between terminals B16 and B20:
There should be less than 0.2 V.
Faulty driver's power seat adjustment switch
A short to ground in the wire
B17
?
B20
RED
?
BLU
Front up-down switch in DOWN position
Measure the voltage between terminals B17 and B20:
There should be about 5 V.
Faulty driver's power seat adjustment switch
An open or high resistance in the wire
Front up-down switch in UP position
Measure the voltage between terminals B17 and B20:
There should be less than 0.2 V.
Faulty driver's power seat adjustment switch
A short to ground in the wire
B39
?
B20
PNK
?
BLU
Rear up-down switch in UP position
Measure the voltage between terminals B39 and B20:
There should be about 5 V.
Faulty driver's power seat adjustment switch
An open or high resistance in the wire
Rear up-down switch in DOWN position
Measure the voltage between terminals B39 and B20:
There should be less than 0.2 V.
Faulty driver's power seat adjustment switch
A short to ground in the wire
B18
?
B20
WHT
?
BLU
Rear up-down switch in DOWN position
Measure the voltage between terminals B18 and B20:
There should be about 5 V.
Faulty driver's power seat adjustment switch
An open or high resistance in the wire
Rear up-down switch in UP position
Measure the voltage between terminals B18 and B20:
There should be less than 0.2 V.
Faulty driver's power seat adjustment switch
A short to ground in the wire

5.
Turn the vehicle to the OFF (LOCK) mode.

6.
Disconnect the connectors from the power seat control unit, and do these input tests at the following 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 7.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
A2
?
A10
GRY
?
BLU
Under all conditions
Connect terminals A1 and A2, and terminals A10 and A9:
The seat should slide backward.
Faulty slide motor
An open or high resistance in the wire
Connect terminals A1 and A10, and terminals A2 and A9:
The seat should slide forward.
A16
?
A18
LT GRN
?
YEL
Under all conditions
Connect terminals A8 and A16, and terminals A18 and A5:
The seat should recline backward.
Faulty recline motor
An open or high resistance in the wire
Connect terminals A8 and A18, and terminals A16 and A5:
The seat should recline forward.
A3
?
A11
BRN
?
PUR
Under all conditions
Connect terminals A1 and A3, and terminals A11 and A9:
The front of seat should move down.
Faulty front up-down motor
An open or high resistance in the wire
Connect terminals A1 and A11, and terminals A3 and A9:
The front of seat should move up.
A7
?
A17
GRN
?
PNK
Under all conditions
Connect terminals A8 and A7, and terminals A17 and A5:
The rear of seat should move up.
Faulty rear up-down motor
An open or high resistance in the wire
Connect terminals A8 and A17, and terminals A7 and A5:
The rear of seat should move down.
Door Multiplex Control Unit

7.
Turn the vehicle to the OFF (LOCK) mode.

8.
Disconnect the following connector.

Power window master switch 37P connector
9.
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 10.

10.
Reconnect the connector to the power window master switch, do the following input tests:
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 11.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
26
RED
Under all conditions
Measure the voltage to ground:
There should be battery voltage.
Blown No. A29 (10 A) fuse in the under-hood fuse/relay box
Faulty under-dash fuse/relay box
An open or high resistance in the wire
4
WHT
Under all conditions
Measure the voltage to ground:
There should be battery voltage.
Blown No. B42 (20 A) fuse in the under-dash fuse/relay box
An open or high resistance in the wire
25
PNK
Vehicle ON mode
Measure the voltage to ground:
There should be battery voltage.
Blown No. B22 (7.5 A) fuse in the under-dash fuse/relay box
An open or high resistance in the wire
3
BLK
In all power modes
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G501)
An open or high resistance in the ground wire
31
BLK
In all power modes, disconnect the driver's power window motor 6P connector
Measure the voltage to ground:
There should be less than 0.2 V.
Poor ground (G501)
An open or high resistance in the ground wire
23
RED
Under all conditions, position 2 switch pressed
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty driving position memory switch
Poor ground (G501) or an open in the ground wire
An open or high resistance in the wire
Under all conditions, position 2 switch released
Measure the voltage to ground:
There should be about 5 V.
Faulty driving position memory switch
A short to ground in the wire
22
LT GRN
Under all conditions, position 1 switch pressed
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty driving position memory switch
Poor ground (G501) or an open in the ground wire
An open or high resistance in the wire
Under all conditions, position 1 switch released
Measure the voltage to ground:
There should be about 5 V.
Faulty driving position memory switch
A short to ground in the wire
20
TAN
Under all conditions, SET switch pressed
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty driving position memory switch
Poor ground (G501) or an open in the ground wire
An open or high resistance in the wire
Under all conditions, SET switch released
Measure the voltage to ground:
There should be about 5 V.
Faulty driving position memory switch
A short to ground in the wire
12
BLU
Under all conditions
Connect terminals No. 4 and No. 12 with a jumper wire:
The driving position memory switch indicator 2 should come on.
Faulty LED
Faulty driving position memory switch
Poor ground (G501) or an open in the ground wire
An open or high resistance in the wire
10
GRN
Under all conditions
Connect terminals No. 4 and No. 10 with a jumper wire:
The driving position memory switch indicator 1 should come on.
Faulty LED
Faulty driving position memory switch
Poor ground (G501) or an open in the ground wire
An open or high resistance in the wire
37
BLK
Under all conditions
Connect terminals No. 4 and No. 37 with a jumper wire:
The driving position memory switch lights should come on.
Faulty LEDs
Faulty driving position memory switch
Poor ground (G501) or an open in the ground wire
An open or high resistance in the wire

11.
Disconnect the connector from the power window master switch, do the following input tests:
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 12.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
12
BLU
Under all conditions
Connect terminals No. 4 and No. 12 with a jumper wire:
The driving position memory switch indicator 2 should come on.
Faulty LED
Faulty driving position memory switch
Poor ground (G501) or an open in the ground wire
An open or high resistance in the wire
10
GRN
Under all conditions
Connect terminals No. 4 and No. 10 with a jumper wire:
The driving position memory switch indicator 1 should come on.
Faulty LED
Faulty driving position memory switch
Poor ground (G501) or an open in the ground wire
An open or high resistance in the wire
37
BLK
Under all conditions
Connect terminals No. 4 and No. 37 with a jumper wire:
The driving position memory switch lights should come on.
Faulty LEDs
Faulty driving position memory switch
Poor ground (G501) or an open in the ground wire
An open or high resistance in the wire

12.
If multiple failures are found on more than one control unit, replace the power seat control unit. If input failures are related to a particular control unit, replace the control unit.