Lexus RX300 (MCU15). Service manual — part 116

–

BODY ELECTRICAL

TROUBLESHOOTING

BE–11

LEXUS RX300 (RM785E)

”Reclining Operation” does not operate.

1. Power Seat Switch (D)

2. Power Seat Switch (P)

3. Wire Harness

4. Reclining Motor (D, P)

BE–126

BE–126

–

BE–126

”Lumbar Support Operation” does not operate.

1. Power Seat Switch (D, P)

2. Wire Harness

3. Lumbar Support Motor (D, P)

BE–126

–

BE–126

(D): Driver’s Seat
(P): Passenger’s Seat
POWER MIRROR CONTROL SYSTEM

Symptom

Suspect Area

See page

Mirror does not operate.

1. RADIO NO.2 Fuse (Instrument Panel J/B)

2. Mirror Switch

3. Mirror Motor

4. Wire Harness

–

DI–598

DI–598

–

Mirror operates abnormally.

1. Mirror Switch

2. Mirror Motor

3. Wire Harness

DI–598

DI–598

–

ELECTRO CHROMIC MIRROR SYSTEM

Symptom

Suspect Area

See page

Electro Chromic Inner Mirror does not operate.

1. ECU–IG Fuse (Instrument Panel J/B)

2. Elector Chromic Inner Mirror

3. Wire Harness

–

BE–137

–

Electro Chromic Outer Mirror does not operate.

1. ECU–IG Fuse (Instrument Panel J/B)

2. Electro Chromic Outer Mirror

3. Elector Chromic Inner Mirror

4. Wire Harness

–

BE–137

BE–137

–

SEAT HEATER SYSTEM

Symptom

Suspect Area

See page

Seat heaters do not operate.

(Driver’s and Passenger’s)

1. SEAT HTR Fuse (Instrument Panel J/B)

2. Engine Main Relay (R/B No.1)

3. Seat Heater Switch

4. Wire Harness

5. Seat Heater

–

BE–140

BE–140

–

BE–140

Driver’s seat heater does not operate.

1. Seat Heater Switch

2. Wire Harness

BE–140

–

Passenger’s seat heater does not operate.

1. Seat Heater Switch

2. Wire Harness

BE–140

–

Seat heater temperature is too hot.

1. Seat Heater

BE–140

BE–12

–

BODY ELECTRICAL

TROUBLESHOOTING

LEXUS RX300 (RM785E)

HORN SYSTEM

Symptom

Suspect Area

See page

Horn system does not operate.

1. HORN Fuse (Engine Room J/B)

2. Horn Relay (Engine Room J/B)

3. Horn Switch

4. Horn

5. Wire Harness

–

BE–192

BE–192

BE–192

–

Horns blow all the time.

1. Horn Relay (Engine Room J/B)

2. Horn Switch

3. Wire Harness

BE–192

BE–192

–

One horn operates but other horn does not operate.

1. Horn

2. Wire Harness

BE–192

–

Horns operate abnormally.

1. Horn Relay (Engine Room J/B)

2. Horn

3. Wire Harness

BE–192

BE–192

–

BE0B6–05

I07351

Instrument Panel J/B

R/B No. 3

D Engine Room J/B
D R/B No. 2
D Fusible Link Block

R/B No. 1

–

BODY ELECTRICAL

POWER SOURCE

BE–13

LEXUS RX300 (RM785E)

POWER SOURCE

LOCATION

BE1YE–01

I04482

S R/B No. 2 (Inside Engine Room Junction Block)

S R/B No. 3 (LHD)

Fuse

Relay

1. H–LP R UPR Fuse
2. H–LP L UPR Fuse
3. A/F HTR Fuse

A. –
B. ABS SOL Relay
C. FAN No. 3 Relay
D. FAN No. 1 Relay
E. ABS MOTOR Relay
F. FAN No. 2 Relay
G. A/F HEATER Relay

Relay

A. DRL No. 2 Relay

BE–14

–

BODY ELECTRICAL

POWER SOURCE

LEXUS RX300 (RM785E)

CIRCUIT