POWER SEAT SWITCH DIAGNOSTIC TEST
The Power Seat Switch Diagnostic Test can be
used to test whether the switch activations are being
recognized by the MHSMM.
ACTIVATION
The Power Seat Switch Diagnostic Test can only be
activated by sending the proper PCI bus command
via the DRB lll scan tool to enter diagnostic test
number 2.
Upon activation of the test the operator has ten
seconds to activate all switches, manual seat
switches - all 8 directions, 3 memory switches, and
both driver and passenger heat HI and LO requests,
but not including the mirrors.
At the conclusion on the ten-second period, the
MHSMM can be requested to provide both Pass/Fail
test information. A Pass condition occurs only if all
the switches are activated. If any of the switches are
not activated, Fail will be registered.
Should a Fail condition occur, the individual switch
information could be accessed using the proper com-
mands on the DRB lll scan tool.
MOTOR TESTS
(1) Remove power seat switch from seat. Refer to
Seat Switch Removal and Installation in this group.
(2) Disconnect wire harness connector.
(3) Check Pin 1 for battery voltage and Pin 5 for
ground.
(4) To test the seat motors and verify proper seat
responses, refer to (Fig. 3) and the Seat Motor Test
table. Using two jumper wires, connect one to a bat-
tery supply and the second to a ground. Connect the
other ends to the seat wire harness connector as
described in the Seat Motor Test table.
SWITCH TEST
(1) Remove switch, refer to Switch Removal and
Installation in this section.
(2) Using an ohmmeter, perform the Seat Switch
Continuity Test table and (Fig. 4). If there is no con-
tinuity at any of the switch positions, replace switch.
VOLTAGE
The following test will determine whether or not
voltage is continuous through the body harness to
the seat switch.
NOTE: POWER IS SUPPLIED TO THE SEAT
THROUGH THE FOUR PIN AIRBAG WIRE CONNEC-
TOR. LOCATED DIRECTLY UNDER THE SEAT (Fig.
5).
WARNING: NEVER TEST SEAT CIRCUITS BY
PROBING AIRBAG WIRE HARNESS CONNECTOR
PINS (Fig. 5). THE AIRBAG WIRE CONNECTOR CAN
BE IDENTIFIED BY ITS YELLOW COLOR (Fig. 5).
CAREFULLY FOLLOW THE TEST PROCEDURES
CALLED OUT IN THIS GROUP OF THE SERVICE
MANUAL TO DIAGNOSE POWER SEATS EQUIPPED
WITH AIRBAGS. FAILURE TO DO SO COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT,
RESULTING IN SERIOUS PERSONAL INJURY.
(1) Remove the front seat cushion side shield from
the seat to be tested. Refer to Group 23, Body for the
procedure.
SEAT MOTOR TEST
SEAT CONNECTOR
CONNECT JUMPER SEAT ACTION
B (+) B (-) DRIVER
SIDE
PASSENGER
SIDE
PIN 9 PIN 6 FRONT
RISER UP
FRONT
RISER
DOWN
PIN 6 PIN 9 FRONT
RISER
DOWN
FRONT
RISER UP
PIN 10 PIN 3 FORWARD FORWARD
PIN 3 PIN 10 REARWARD REARWARD
PIN 8 PIN 7 REAR
RISER UP
REAR RISER
DOWN
PIN 7 PIN 8 REAR
RISER
DOWN
REAR RISER
UP
PIN 4 PIN 2 RECLINER
UP
RECLINER
UP
PIN 2 PIN 4 RECLINER
DOWN
RECLINER
DOWN
Fig. 3 Power Seat Wire Harness Pin Call-Out
1 – BLUE
2 – VIEWED FROM TERMINAL END
8R - 4 POWER SEAT SYSTEMS LH
DIAGNOSIS AND TESTING (Continued)
2000 LHS, 300M, CONCORDE AND INTREPID
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