Page 489 of 1500

ON-VEHICLE SERVICE
SIMPLIFIED WIRING SYSTEM (SWS)54B-489
Keyless entry and
power door lock
systemKeyless entry system confirmation
by hornThe horn answerback honking conditions can
be set in the following ways.
a. Horn sounds
b. Horn sounds if doors are already locked
c. Horn does not sound (default)
Keyless entry system confirmation
by turn-signal lampsThe hazard answerback flashing conditions
can be set in the following ways.
a. Locking and unlocking (default)
b. Locking only
c. Unlocking only
d. No indication
Time until automatic relocking after
unlock operation using keyless
entry systemThe timed lock period after unlocking with the
keyless entry transmitter can be set to the
following times.
a. 30 seconds (default)
b. 60 seconds
c. 120 seconds
d. 180 seconds
Unlock operation using keyless
entry system or door keyThe unlocking operations after unlocking with
or without a key can be set in the following
ways.
a. Unlock driver's door on first unlock
operation, and unlock all doors on second
unlock operation (default)
b. Unlock all doors on first unlock operation
Buzzers Turn-signal buzzer The turn-signal buzzer function can be
activated or deactivated. (OFF by default)
Door-ajar warning buzzer The door ajar warning buzzer function can be
activated or deactivated (ON by default).
Default Initialization of above mentioned functions ITEM (multi-center display) ADJUSTMENT DETAILS
Page 492 of 1500
GENERAL DESCRIPTION
INTERIOR52A-3
GENERAL DESCRIPTIONM1521000100184
OPERATION
.
Seat belt warning system
If the driver turn the ignition switch to the "ON" posi-
tion without fastening the seat belt, the seat belt
warning light illuminates.
SEAT BELT DIAGNOSISM1523000700182
The seat belt warning system is controlled by the
Simplified Wiring System (SWS). For troubleshoot-
ing, refer to GROUP 54B, SWS diagnosis
P.54B-101.
SPECIAL TOOLSM1521000600327
TOOL TOOL NUMBER AND
NAMESUPERSESSION APPLICATION
MB990784
Ornament removerGeneral service
toolRemoval of switch, trim,
etc.
Page 512 of 1500

FRONT SEAT ASSEMBLY
INTERIOR52A-23
INSPECTIONM1522005500113
POWER SEAT CONTINUITY AND DIAGNOSIS
CHECK
SPECIAL TOOL:
MB991219: Inspection Test Harness
CIRCUIT DIAGRAMS:
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
NOTE: Check connectors and terminals for damage or
loose connections at the seat harness and all supply
circuits connections to seat. Repair or replace wiring
harness if damaged.
NON-MEMORY SEAT DIAGNOSIS
POWER SEAT SUPPLY AND GROUND CONNECTOR (D-40)
NOTE: The special tool (Inspection test harness) MB991219
for connector pin contact pressure should be used. The test
probe should never be forcibly inserted, as it may cause a
defective contact.
4-WAY TRACK (NON MEMORY)
NOTE: The special tool (Inspection test harness) MB991219
for connector pin contact pressure should be used. The test
probe should never be forcibly inserted, as it may cause a
defective contact. SUPPLY TEST
CONNECTION
(D-40) SPECIFIED CONDITION
BATTERY
SUPPLY112V
GROUND 2 Less than 2 ohms or 0V
SWITCH POSITION TEST CONNECTION SPECIFIED CONDITION
SWITCH MOTOR
REAR LIFT MOTOR UP 1 1 Less than 2 ohms
DOWN 4 5 Less than 2 ohms
FRONT LIFT MOTOR UP 2 1 Less than 2 ohms
DOWN 3 5 Less than 2 ohms
Page 514 of 1500

FRONT SEAT ASSEMBLY
INTERIOR52A-25
MEMORY SEAT DIAGNOSIS
POWER SEAT SUPPLY AND GROUND CONNECTOR (D-40)
SPECIAL TOOL:
MB991219: Inspection Test Harness
CIRCUIT DIAGRAMS:
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
NOTE: Check connectors and terminals for damage or
loose connections at the seat harness and all supply
circuits connections to seat. Repair or replace wiring
harness if damaged.
NOTE: The special tool (Inspection test harness) MB991219
for connector pin contact pressure should be used. The test
probe should never be forcibly inserted, as it may cause a
defective contact.
10-WAY TRACK (MEMORY)- SOURCE TO (MSC) POWER
CONNECTOR (D-38)
NOTE: The special tool (Inspection test harness) MB991219
for connector pin contact pressure should be used. The test
probe should never be forcibly inserted, as it may cause a
defective contact. SUPPLY TEST
CONNECTION
(D-40) SPECIFIED CONDITION
BATTERY
SUPPLY112V
GROUND 2 Less than 2 ohms or 0V
CIRCUIT
DESCRIPTION TEST CONNECTION
(MSC)
POWER
(D-38) SOURCE INTERMEDIATE
CONNECTOR
GROUND 1 GROUND 15 -
"NEUTRAL" 2 A/T-ECU (B-19) 31 (B-25) pin 9
Bus LT 3 - -
IGNITION- LED ON 4 (IGN 2) J/B fuse 9 (C-28) pin 35
DOOR SW.- LED ON 5 RH Door sw. (D-34) 2 -
VEHICLE SPEED 6 A/T-ECU (B-19) 24 (C-25) pin 8
"PARK" 7 A/T-ECU (B-19) 30 (C-25) pin 10
N.C - - -
Page 515 of 1500

FRONT SEAT ASSEMBLY
INTERIOR52A-26
10-WAY TRACK (MEMORY)-switch to module- 20 pin
CIRCUIT DIAGRAMS:
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
NOTE: Check connectors and terminals for damage or
loose connections at the seat harness and all supply
circuits connections to seat. Repair or replace wiring
harness if damaged.
NOTE: The special tool (Inspection test harness) MB991219
for connector pin contact pressure should be used. The test
probe should never be forcibly inserted, as it may cause a
defective contact.
10-WAY TRACK (MEMORY) 12pin connector (A) at module
to motor circuits
NOTE: The special tool (Inspection test harness) MB991219
for connector pin contact pressure should be used. The test
probe should never be forcibly inserted, as it may cause a
defective contact. SWITCH POSITION TEST CONNECTION SPECIFIED CONDITION
SWITCH (MSC)
MODULE
20 PIN
REAR LIFT MOTOR UP 7 16 Less than 2 ohms
DOWN 8 13 Less than 2 ohms
FRONT LIFT MOTOR UP 6 5 Less than 2 ohms
DOWN 9 7 Less than 2 ohms
TRACK/ SLIDE MOTOR FORWARD 10 4 Less than 2 ohms
BACK 3 3 Less than 2 ohms
RECLINING MOTOR FORWARD 4 14 Less than 2 ohms
BACK 2 2 Less than 2 ohms
SWITCH POSITION TEST CONNECTION SPECIFIED CONDITION
(MSC)
MODULE
12 PIN(A) MOTOR
REAR LIFT MOTOR UP 2 1 Less than 2 ohms
DOWN 3 5 Less than 2 ohms
FRONT LIFT MOTOR UP 11 5 Less than 2 ohms
DOWN 10 1 Less than 2 ohms
TRACK/ SLIDE MOTOR FORWARD 4 2 Less than 2 ohms
BACK 9 1 Less than 2 ohms
Page 516 of 1500

FRONT SEAT ASSEMBLY
INTERIOR52A-27
10-WAY TRACK (MEMORY) lumbar switch to module
(20-pin)
CIRCUIT DIAGRAMS:
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
NOTE: Check connectors and terminals for damage or
loose connections at the seat harness and all supply
circuits connections to seat. Repair or replace wiring
harness if damaged.
NOTE: The special tool (Inspection test harness) MB991219
for connector pin contact pressure should be used. The test
probe should never be forcibly inserted, as it may cause a
defective contact.
10-WAY TRACK (MEMORY) lumbar and recline module
connector (12-pin) to motors
NOTE: The special tool (Inspection test harness) MB991219
for connector pin contact pressure should be used. The test
probe should never be forcibly inserted, as it may cause a
defective contact. SWITCH POSITION TEST CONNECTION SPECIFIED CONDITION
SWITCH (MSC)
MODULE
LUMBAR SWITCH SOFTER 2 12 (20pin) Less than 2 ohms
HARDER 4 6 (20pin) Less than 2 ohms
MEMORY 3 6 (16pin) Less than 2 ohms
SWITCH POSITION TEST CONNECTION SPECIFIED CONDITION
(MSC)
MODULE
12 PIN MOTOR
LUMBAR MOTOR SOFTER 7 1 Less than 2 ohms
HARDER 2 2 Less than 2 ohms
RECLINER MOTOR FORWARD 1 1 Less than 2 ohms
BACK 8 5 Less than 2 ohms
Page 518 of 1500
FRONT SEAT ASSEMBLY
INTERIOR52A-29
OPERATION CHECK OF POWER SEAT MOTOR
CIRCUIT DIAGRAMS:
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
NOTE: Check connectors and terminals for damage or
loose connections at the seat harness and all supply
circuits connections to seat. Repair or replace wiring
harness if damaged.
MOTOR DESCRIPTION TERMINAL MEASUREMENT
TRACK/ SLIDE MOTOR BACKWARD 1 MOTOR ON= 12V
MOTOR OFF = GROUND.
FORWARD 2 MOTOR ON= 12V
MOTOR OFF = GROUND.
FRONT LIFT MOTOR UP 1- non memory
5- memoryMOTOR ON= 12V
MOTOR OFF = GROUND.
DOWN 5- non memory
1- memoryMOTOR ON= 12V
MOTOR OFF = GROUND.
REAR LIFT MOTOR UP 1 MOTOR ON= 12V
MOTOR OFF = GROUND.
DOWN 5 MOTOR ON= 12V
MOTOR OFF = GROUND.
RECLINER MOTOR FORWARD 1 MOTOR ON= 12V
MOTOR OFF = GROUND.
BACKWARD 5 MOTOR ON= 12V
MOTOR OFF = GROUND.
LUMBAR MOTOR SOFTER 1 MOTOR ON= 2.5V - 5V
MOTOR OFF = GROUND.
HARDER 2 MOTOR ON= 2.5V - 5V
MOTOR OFF = GROUND.
Page 519 of 1500
FRONT SEAT ASSEMBLY
INTERIOR52A-30
1.If abnormality was found, check the power seat
adjuster assembly.
CIRCUIT DIAGRAMS:
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
NOTE: Check connectors and terminals for damage or
loose connections at the seat harness and all supply
circuits connections to seat. Repair or replace wiring
harness if damaged.