Lexus LS400 (2000 year). Manual — part 30

Z14905

BE0CU–01

N13349

Z14753

Wire Harness Side

–

BODY ELECTRICAL

SEAT HEATER SYSTEM

BE–197

2060

INSPECTION

1.

INSPECT SEAT HEATER SWITCH CONTINUITY

Condition

Tester connection

Specified condition

OFF

–

No continuity

ON (Left)

8 – 9 – 11

Continuity

ON (Right)

8 – 11 – 13

Continuity

Illumination

10 – 12

Continuity

If continuity is not as specified, replace the switch or bulb.

2.

INSPECT SEAT HEATER SWITCH INDICATOR

(a)

Connect the positive (+) lead from the battery to terminal
11 and the negative (–) lead to terminal 8.

(b)

Push the switch and check that the indicator light lights
up.

If operation is not as specified, replace the switch.

3.

INSPECT SEAT HEATER SWITCH CIRCUIT

Disconnect the switch connector and inspect the connector on
the wire harness side, as shown.

Tester connection to

terminal number

Condition

Specified condition

8 – Ground

Constant

Continuity

9 – Ground

Constant

* Continuity

13 – Ground

Constant

* Continuity

11 – Ground

Ignition switch turned to ON

Battery positive voltage

*: There is resistance because this circuit is grounded through
the relay coil.
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

Z08901

BE4730

BE–198

–

BODY ELECTRICAL

SEAT HEATER SYSTEM

2061

4.

INSPECT ENGINE MAIN RELAY CONTINUITY

Condition

Tester connection

Specified condition

Constant

1 – 3

2 – 4

Continuity

Apply B+ between

terminals 1 and 3.

4 – 5

Continuity

If continuity is not as specified, replace the relay.

5.

INSPECT ENGINE MAIN RELAY CIRCUIT

Remove the relay and inspect the connector on the junction
block side, as shown.

Tester connection

Condition

Specified condition

2 – Ground

Constant

Continuity

3 – Ground

Constant

Continuity

1 – Ground

Ignition switch ON

Battery positive voltage

5 – Ground

Constant

Battery positive voltage

If circuit is not as specified, inspect the circuits connected to oth-
er parts.

Z14754

Seat Cushion Side

Connector ”A”

Connector ”B”

Z14755

Seat Back Side

–

BODY ELECTRICAL

SEAT HEATER SYSTEM

BE–199

2062

6.

Seat Cushion:
INSPECT SEAT HEATER CONTINUITY

(a)

Heat the thermostat with a light.

(b)

Inspect the seat heater continuity between terminals.

Tester connection

Condition

Specified condition

A2 – B3

Constant

Continuity

A1 – B1

Seat heater temperature bellow 25

°

C (77

°

F)

Continuity

B1 – B2

Seat heater temperature bellow 25

°

C (77

°

F)

Continuity

A1 – B2

Seat heater temperature bellow 25

°

C (77

°

F)

Continuity

A1 – B1

Seat heater temperature above

55

°

C (131

°

F)

No continuity

B1 – B2

Seat heater temperature above

45

°

C (113

°

F)

No continuity

A1 – B2

Seat heater temperature above

45

°

C (113

°

F)

No continuity

If continuity is not as specified, replace the seat cushion pad.

7.

Seat Back:
INSPECT SEAT HEATER CONTINUITY

Inspect the seat heater continuity between terminals, as
shown.

Tester connection

Condition

Specified condition

1 – 3

Constant

Continuity

2 – 3

Constant

Continuity

If continuity is not as specified, replace the seat back pad.

BE0CV–01

I03237

Fuel Lid Opener Switch

Instrument Panel Junction Block

FUEL OPN Fuse

Fuel Lid Opener Solenoid

BE–200

–

2063

FUEL LID OPENER SYSTEM

LOCATION