Lexus RX300 (MCU15). Service manual — part 158

BE1YQ–01

I04188

Wire Harness Side

I08150

Connector ”B”

Connector ”C”

Connector ”A”

Wire Harness Side

–

BODY ELECTRICAL

AUDIO SYSTEM (Except Europe)

BE–179

LEXUS RX300 (RM785E)

INSPECTION

1.

INSPECT CD AUTO CHANGER CIRCUIT

Disconnect connectors from CD auto changer and inspect the
connector on the wire harness side.

Tester connection

Condition

Specified condition

8 – Ground

Constant

Continuity

12 – Ground

Ignition switch LOCK

No voltage

12 – Ground

Ignition switch ACC or ON

Battery positive voltage

5 – Ground

Constant

Battery positive voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.
HINT:

S

Check the wire harness between the radio receiver as-
sembly and the CD auto changer.

S

Since the signals to and from the MUTE, R

–

, R

+

, L

–

, L

+

,

TX

–

and TX

+

terminals are serial signals, they cannot or-

dinarily be measured with a tester.

2.

INSPECT POWER AMPLIFIER CIRCUIT

Disconnect the connector from power amplifier and inspect the
connector on the wire harness side.

I07332

Connector ”B”

Connector ”C”

Connector ”A”

Wire Harness Side

BE–180

–

BODY ELECTRICAL

AUDIO SYSTEM (Except Europe)

LEXUS RX300 (RM785E)

Tester connection

Condition

Specified condition

A6 – Ground

Constant

Continuity

A3 – Ground

Ignition switch LOCK and radio switch ON

No voltage

A3 – Ground

Ignition switch ACC or ON and radio switch ON

Battery positive voltage

A4 – Ground

Constant

Battery positive voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.

3.

INSPECT RADIO RECEIVER ASSEMBLY CIRCUIT

Disconnect the connectors from the radio receiver assembly,
and inspect the connector on the wire harness side.

Tester connection

Condition

Specified condition

A2 – Ground

Constant

Continuity

A4 – Ground

Constant

Battery positive voltage

A1 – Ground

Ignition switch LOCK

No voltage

A1 – Ground

Ignition switch ACC or ON

Battery positive voltage

HINT:
Check the wire harness between radio receiver assembly and
the CD auto changer, between radio receiver assembly and
power amplifier.

I10173

Housing

Wire Harness

BE1AQ–02

–

BODY ELECTRICAL

ANTENNA

BE–181

LEXUS RX300 (RM785E)

ANTENNA

PRECAUTION

1.

DISCONNECT ANTENNA CABLE

Hold the connector housing and pull it out.
NOTICE:
Do not pull the wire harness itself.
2.

CONNECT ANTENNA CABLE

Hold the connector housing and fully insert the connector until
it stops with a click.
HINT:
After connection, slightly pull the wire harness to check that it
is locked.

BE1AR–02

I19178

Radio Receiver

BE–182

–

BODY ELECTRICAL

ANTENNA

LEXUS RX300 (RM785E)

LOCATION