System Description

NOTE:

When handling seat, be extremely careful not to scratch heating unit
To replace heating unit, seat trim and pad should be separated.
Do not use any organic solvent, such as thinner, benzene, alcohol, etc. to clean trims.

Power is all time supplied

to rear LH seat control unit and rear RH seat control unit terminal 1.
through 50A fusible link [Letter F, located in the fuse block (J/B)],
to IPDM E/R (heated seat relay) terminal 14.
through 15A fuse [No.38, located in the fuse block (J/B)].

With the ignition switch to ON or START position, power is supplied

to rear LH seat control unit terminal 4 and
to rear heated seat switch LH terminal 6.
through IPDM E/R (heated seat relay) terminal 12
to rear RH seat control unit terminal 4 and
to rear heated seat switch RH terminal 6
through IPDM E/R (heated seat relay) terminal 9.

When rear heated seat switch (LH, RH) is LOW position, ground is suppled

to rear seat control unit terminal 18,
through rear heated seat switch terminal 2,
through rear heated seat switch terminal 3,
through body grounds B5, B40 and B131

Then rear seat control unit recognizes that rear heated seat switch is LOW position.

When rear heated seat switch is LOW position, power is supplied

through rear seat control unit terminal 6,
through rear seat cushion heater terminal 2,
through rear seat cushion heater terminal 3,
to rear seatback heater terminal 1.

Then ground is suppled

to rear seatback heater terminal 2.
through body grounds B5, B40 and B131.

With power and ground supplied, rear heated seat is operated.

When rear heated seat switch is in LOW position, ground is supplied

to rear heated seat switch terminal 5,
through rear seat control unit terminal 14,
through rear seat control unit terminal 13,
through body grounds B5, B40 and B131.

With power and ground supplied, rear heated seat switch LOW position indicator is illuminated

When rear heated seat switch (LH, RH) is in HIGH position, ground is suppled

to rear seat control unit terminal 17,
through rear heated seat switch terminal 1,
through rear heated seat switch terminal 3,
through body grounds B5, B40 and B131

Then rear seat control unit recognizes that rear heated seat switch is in HIGH position.

When rear heated seat switch is in HIGH position, power is supplied

through rear seat control unit terminal 5,
through rear seat cushion heater terminal 1,
through rear seat cushion heater terminal 3,
to rear seatback heater terminal 1.

Then ground is suppled

to rear seatback heater terminal 2.
through body grounds B5, B40 and B131.
to rear seat cushion heater terminal 2,
through rear seat control unit terminal 6,
through rear seat control unit terminal 8,
through body grounds B5, B40 and B131.

With power and ground supplied, rear heated seat generates heat more than the time of LOW position.

When rear heated seat switch is in HIGH position, ground is supplied

to rear heated seat switch terminal 4,
through rear seat control unit terminal 9,
through rear seat control unit terminal 13,
through body grounds B5, B40 and B131.

With power and ground supplied rear heated seat switch HIGH position indicator is illuminated.