Lexus RX300 (MCU15). Manual — part 334

DI–568

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DIAGNOSTICS

BODY CONTROL SYSTEM

LEXUS RX300 (RM785E)

RWLS ↔ GND1, 2

R L ↔ W B

Ignition switch ON, rear wiper switch OFF, WASH1 or INT

10 – 14

RWLS ↔ GND1, 2

(B7–12 ↔ B5–9, B8–2)

R–L ↔ W–B

Ignition switch ON, rear wiper switch ON or WASH2

Below 1.0

RWW ↔ GND1, 2

L Y ↔ W B

Ignition switch ON, rear wiper switch OFF, ON or INT

10 – 14

RWW ↔ GND1, 2

(B7–13 ↔ B5–9, B8–2)

L–Y ↔ W–B

Ignition switch ON, rear wiper switch WASH1 or 2

Below 1.0

STP1 ↔ GND1, 2

G O ↔ W B

Stop light switch OFF

Below 1.0

STP1 ↔ GND1, 2

(B7–18 ↔ B5–9, B8–2)

G–O ↔ W–B

Stop light switch ON

10 – 14

PKB ↔ GND1, 2

R B ↔ W B

Ignition switch ON, PKB switch OFF

10 – 14

PKB ↔ GND1, 2

(B7–19 ↔ B5–9, B8–2)

R–B ↔ W–B

Ignition switch ON, PKB switch ON

Below 1.0

HF

*1

↔ GND1, 2

R ↔ W B

Headlight dimmer switch LOW or HI

10 – 14

HF ↔ GND1, 2

(B7–20 ↔ B5–9, B8–2)

R ↔ W–B

Headlight dimmer switch FLASH

Below 1.0

RWC1 ↔ GND1, 2

R ↔ W B

Ignition switch ON, rear wiper switch except INT

10 – 14

RWC1 ↔ GND1, 2

(B7–21 ↔ B5–9, B8–2)

R ↔ W–B

Ignition switch ON, rear wiper switch INT

Below 1.0

A ↔ GND1, 2

P ↔ W B

Light control switch except AUTO

10 – 14

A ↔ GND1, 2

(B6–4 ↔ B5–9, B8–2)

P ↔ W–B

Light control switch except AUTO

Below 1.0

HU

*1

↔ GND1, 2

R W ↔ W B

Headlight dimmer switch LOW

10 – 14

HU ↔ GND1, 2

(B6–5 ↔ B5–9, B8–2)

R–W ↔ W–B

Headlight dimmer switch HI or FLASH

Below 1.0

FFOG ↔ GND1, 2

G Y ↔ W B

Headlight dimmer switch LOW, fog light switch OFF

10 – 14

FFOG ↔ GND1, 2

(B6–7 ↔ B5–9, B8–2)

G–Y ↔ W–B

Headlight dimmer switch LOW, fog light switch ON

Below 1.0

RFGO ↔ GND1, 2

G W ↔ W B

Rear fog light OFF

10 – 14

RFGO ↔ GND1, 2

(B6–11 ↔ B5–9, B8–2)

G–W ↔ W–B

Rear fog light ON

Below 1.0

RDR+ ↔ GND1, 2

L B ↔ W B

Back door lock motor is activated to lock

Below 1.0

RDR+ ↔ GND1, 2

(B5–1 ↔ B5–9, B8–2)

L–B ↔ W–B

Back door lock motor is not operated

10 – 14

BECU ↔ GND1, 2

(B5–2 ↔ B5–9, B8–2)

G–B

*1

↔ W–B

W–L

*2

Constant

10 – 14

RWLM ↔ GND1, 2

L ↔ W B

Rear wiper switch OFF

Below 1.0

RWLM ↔ GND1, 2

(B5–3 ↔ B5–9, B8–2)

L ↔ W–B

Rear wiper switch ON, ignition switch ON

10 – 14

RWIG ↔ GND1, 2

L W ↔ W B

Ignition switch OFF

Below 1.0

RWIG ↔ GND1, 2

(B5–4 ↔ B5–9, B8–2)

L–W ↔ W–B

Ignition switch ON

10 – 14

RDR– ↔ GND1, 2

L R ↔ W B

Back door lock motor is activated to unlock

Below 1.0

RDR ↔ GND1, 2

(B5–6 ↔ B5–9, B8–2)

L–R ↔ W–B

Back door lock motor is not operated

10 – 14

RWSW ↔ GND1, 2

L O ↔ W B

Rear wiper operated

10 – 14

RWSW ↔ GND1, 2

(B5–7 ↔ B5–9, B8–2)

L–O ↔ W–B

Rear wiper STOP

Below 1.0

WIG ↔ GND1, 2

L Y ↔ W B

Ignition switch OFF

Below 1.0

WIG ↔ GND1, 2

(B5–8 ↔ B5–9, B8–2)

L–Y ↔ W–B

Ignition switch ON

10 – 14

GND1 ↔ Body ground

(B5–9 ↔ Body ground)

W–B

Constant

Below 1.0

DIM

*1

↔ GND1, 2

G

W B

Headlight dimmer switch LOW

10 – 14

DIM ↔ GND1, 2

(B5–10 ↔ B5–9, B8–2)

G ↔ W–B

Headlight dimmer switch HI or FLASH

Below 1.0

HRLY ↔ GND1, 2

R

W B

Light control switch OFF or TAIL

10 – 14

HRLY ↔ GND1, 2

(B5–12 ↔ B5–9, B8–2)

R ↔ W–B

Light control switch HEAD

Below 1.0

DRL

*1

↔ GND1, 2

G Y

W B

Engine running and PKB switch OFF

Below 1.0

DRL ↔ GND1, 2

(B5–14 ↔ B5–9, B8–2)

G–Y ↔ W–B

Engine running and PKB switch ON or light control switch HEAD

10 – 14

HEAD ↔ GND1, 2

R L

W B

Light control switch OFF or TAIL

10 – 14

HEAD ↔ GND1, 2

(B5–15 ↔ B5–9, B8–2)

R–L ↔ W–B

Light control switch HEAD

Below 1.0

TAIL ↔ GND1, 2

G R

W B

Light control switch OFF

10 – 14

TAIL ↔ GND1, 2

(B5–16 ↔ B5–9, B8–2)

G–R ↔ W–B

Light control switch TAIL or HEAD

Below 1.0

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DIAGNOSTICS

BODY CONTROL SYSTEM

DI–569

LEXUS RX300 (RM785E)

LSWA ↔ GND1, 2

GR ↔ W B

Back door locked

10 – 14

LSWA ↔ GND1, 2

(B5–17 ↔ B5–9, B8–2)

GR ↔ W–B

Back door unlocked

Below 1.0

*1: LHD
*2: RHD

DI1OH–09

DI–570

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DIAGNOSTICS

BODY CONTROL SYSTEM

LEXUS RX300 (RM785E)

PROBLEM SYMPTOMS TABLE

DOOR LOCK CONTROL

Symptom

Suspect Area

See page

Lock or unlock cannot be operated with door lock control S/W.

1. Driver ECU (or passenger ECU)

2. Body ECU

–

–

Door key linked function does not operate.

1. Driver Door ECU (or Passenger Door ECU)

2. Body ECU

–

–

Key confinement prevention function does not operate.

1. Key unlock switch circuit

2. Body ECU

DI–590

WIRELESS DOOR LOCK CONTROL

Symptom

Suspect Area

See page

All function of wireless door lock control system do not operate.

1. Transmitter

2. Wireless tuner circuit

3. Key unlock warning switch circuit

4. Body ECU

BE–116

DI–584

DI–590

Lock (or unlock) function does not operate.

1. Door unlock detection switch circuit

2. Any door ECU

3. Body ECU

DI–608

DI–630

DI–653

DI–670

Automatic lock function operates even if any door is opened within

30 seconds after all doors are unlocked by wireless door lock

control system .

1. Door courtesy switch circuit

2. Any door ECU

3. Body ECU

DI–612

DI–634

DI–655

DI–672

Buzzer sound, but wireless door lock function does not operate.

1. Body ECU

REAR WIPER AND WASHER

Symptom

Suspect Area

See page

Rear wiper does not operate.

1. Wiper switch circuit

2. Rear wiper motor circuit

3. Body ECU

BE–56

BE–56

Rear washer does not operate.

1. Washer switch circuit

2. Washer motor

3. Wire harness

BE–56

BE–56

LIGHT CONTROL

Symptom

Suspect Area

See page

Automatic light control does not operate

1. Light sensor circuit

2. Headlight control switch circuit

3. Body ECU

DI–714

DI–575

Auto turn–off does not operate

1. Door courtesy switch circuit (Driver side)

2. Ignition switch

3. Driver door ECU

4. Body ECU

DI–612

BE–26

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DIAGNOSTICS

BODY CONTROL SYSTEM

DI–571

LEXUS RX300 (RM785E)

OTHERS

Symptom

Suspect Area

See page

Does not operate the illuminated entry

1. Illumination circuit

2. Body ECU

DI–588

A/C panel and multi display does not deteriorate.

1. Rheostat light control circuit

2. Body ECU

BE–68