Lexus RX300 (MCU15). Manual — part 380

Absence of
Master

D6

01
(Communication
Control)

Component in which this code is re-
corded has been disconnected
from system with ignition in ACC or
ON. Or, when this code was re-
corded, multi–display assembly
was disconnected.

D Check harness for power supply
system of multi display.
D Check harness for communica-
tion system of multi display.
D Check harness for power supply
system of navigation ECU.
D Check harness for communica-
tion system of navigation ECU.

Connection
Check Error

D7

01 *6
(Communication
Control)

Component in which this code is re-
corded has been disconnected
from system after engine start.
Or, when this code was recorded,
multi–display assembly was dis-
connected.
D6

D Check harness for power supply
system of multi display.
D Check harness for communica-
tion system of multi display.
D Check harness for power supply
system of navigation ECU.
D Check harness for communica-
tion system of navigation ECU.

Transmission
Error

DC

01
(Communication
Control)

Transmission to component shown
by auxiliary code has been failed.
(This code does not necessarily
mean actual failure.)

If same auxiliary code is recorded in
other component(s), check harness
for power supply and communica-
tion system of components shown
sub code.

Master Reset
(Momentary
Interruption)

DD

01
(Communication
Control)

D Check harness for power supply
system of multi–display assembly.
D Check harness for communica-
tion system of multi–display assem-
bly.
D If error occurs frequently, replace
multi–display assembly.

Registration
Completion
Instruction
Error

E0

01
(Communication
Control)

”Registration Completion Instruc-
tion” command from multi display
cannot be received.

Since this DTC is provided for engi-
neering, it may be detected when
no actual failure exists.

ON/OFF
Instruction
Parameter
Error

E2

01
(Communication
Control)

Error is detected in ON/OFF control
command from multi–display as-
sembly.

Replace multi–display assembly.

Registration
Request
Transmission

E3

01
(Communication
Control)

Since this DTC is provided for engi-
neering, it may be detected when
no actual failure exists.

D Registration Request command
is output from slave component.
D By reception of connection check
Instruction, Registration Request
command is output from sub–mas-
ter component.

After engine is started, multi–dis-
play assembly was disconnected
from system.

Master Error

DF

01
(Communication
Control)

Due to defective condition of com-
ponent with a display, master func-
tion is switched to audio equip-
ment . Error occurs in communica-
tion between sub–master (audio)
and master component.

D Check harness for power supply
of multi–display assembly.
D Check harness for communica-
tion system of multi–display assem-
bly.
D Check harness for communica-
tion system between multi–display
assembly and sub–master compo-
nent.

Plural Frame
Abort

E4

01
(Communication
Control)

D Since this DTC is provided for en-
gineering purpose, it may be de-
tected when no actual failure exists.

Plural frame transmission is
aborted.

*6: When 210 sec. has passed after pulling out the power supply connector of the master component with the ignition
switch in ACC or ON, this code is stored.

DI–750

–

DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

LEXUS RX300 (RM785E)

DI7OS–03

I19229

Engine Room J/B
D DOME Fuse

Multi Display

Navigation Antenna

Navigation ECU

Center Cluster Integration Panel
D

Radio Assembly

Instrument Panel J/B
D ACC Fuse
D ECU–B Fuse
D ECU–IG Fuse

–

DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

DI–751

LEXUS RX300 (RM785E)

PARTS LOCATION

DI7OT–03

I15528

M5

M6

M7

DI–752

–

DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

LEXUS RX300 (RM785E)

TERMINALS OF ECU

MULTI DISPLAY

Symbols

Condition

STD Voltage (V)

Problem symptom when

open circuit is detected.

Symbols

(Terminals NO. )

Condition

STD Voltage (V)

Problem symptom when

short circuit is detected.

TX+ (M5–3)

Ignition switch

ACC or ON

About 2.5 V

Screen is in disorder.

TX3+ (M5–4)

Ignition switch

ACC or ON

About 2.5 V

Screen is in disorder.

SPD ↔ GND

(M5–5 ↔ M7–6)

Ignition switch ON, and driving

wheel rotated slowly

Repeatedly changes from below 1

to 9 V

Fuel efficiency cannot be calcu-

lated.

TX– (M5–10)

Ignition switch

ACC or ON

About 2.5 V

Screen is in disorder.

TX3– (M5–11)

Ignition switch

ACC or ON

About 2.5 V

Screen is in disorder.

PKB ↔ GND

(M5–13 ↔ M7–6)

Parking brake switch ON (parking

brake lever released)

5 V

The system cannot enter Diagno-

sis System mode.

TC ↔ GND

Ignition switch OFF and connect

Continuity

Navigation system is normal.

TC ↔ GND

(M5–14 ↔ M7–6)

Ignition switch OFF and connect

thermals TC and E1 of diagnosis

check connector

Continuity

The system cannot exit Service

Check mode.

VR ↔ VG

(M6–1 ↔ M6–6)

Constant

Continuity

Screen noise or other types of

noise occur.

R ↔ VG

(M6–2 ↔ M6–6)

Diagnosis display check screen is

white (Using an oscilloscope)

0.7 V ± 0.1 V *2

Screen color turns to blue.

B ↔ VG

(M6–3 ↔ M6–6)

Diagnosis display check screen is

white (Using an oscilloscope)

0.7 V ± 0.1 V *2

Screen color turns to yellow.

TX1+ (M6–5)

AVC–LAN

communication circuit

–

Navigation system does not oper-

ate.

VG ↔ GND

(M6–6 ↔ M7–6)

Constant

Continuity

Screen noise or other types of

noise occur.

(M6 6 ↔ M7 6)

Navigation system does not op-

eration.

G ↔ VG

(M6–7 ↔ M6–6)

Diagnosis display check screen is

white (Using an oscilloscope)

0.7 V ± 0.1 V *2

Screen color turns to red–purple.

–

DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

DI–753

LEXUS RX300 (RM785E)

SYNC ↔ VG

(M6–8 ↔ M6–6)

Display ON

(Using an oscilloscope)

0.5 V – 1.3 V *1

Screen is in disorder

TX1– (M6–10)

AVC–LAN

communication circuit

–

Navigation system does not oper-

ate.

+B1 ↔ GND

(M7–1 ↔ M7–6)

Constant

10 – 14 V

Navigation system does not oper-

ate.

IG ↔ GND

(M7–2 ↔ M7–6)

Ignition switch ON

10 – 14 V

Navigation system does not oper-

ate.

DR ↔ GND

(M7–3 ↔ M7–6)

Light control switch TAIL or HEAD

and cover the top of automatic

light control sensor

9 V or more

No problem is identified in the dis-

play.

ACC ↔ GND

(M7–4 ↔ M7–6)

Ignition switch ACC

10 – 14 V

Navigation system does not oper-

ate.

GND ↔ Body ground

(M7–6 ↔ Body ground)

Constant

Below 1 V

Audio system is normal.

TAIL ↔ GND

(M7–8 ↔ M7–6)

Light control switch TAIL or HEAD

9 V or more

Switching between Night and Day

mode cannot be done.