Lexus LS400 (2000 year). Service manual — part 37

BE0CZ–01

I03405

Engine Room Junction Block

DOME Fuse

RADIO No.1 Fuse

Instrument Panel
Junction Block

RADIO No.2 Fuse

Ignition Switch

Tweeter
Speaker

CD Auto
Changer

Radio Receiver
Assembly

Rear Door Speaker

Front Door Speaker

Power Amplifier

Tweeter Speaker

Front Door Speaker

Rear Door Speaker

Woofer Speaker

–

BE–225

2088

LOCATION

BE0D0–01

Z14756

Wire Harness Side

Connector ”A”

Connector ”B”

Connector ”C”

Z14757

Wire Harness Side

Connector ”A”

Connector ”B”

Connector ”C”

Connector ”D”

e–9–1 e–13–1–A

eh–14–1 h–14–1–A

BE–226

–

BODY ELECTRICAL

AUDIO SYSTEM

2089

INSPECTION

1.

Nakamichi made:
INSPECT RADIO RECEIVER ASSEMBLY CIRCUIT

Disconnect the connectors from the radio receiver assembly.
And inspect the connector on the wire harness side, as shown.

Tester connection

Condition

Specified condition

B14 – Ground

Constant

Continuity

B6 – Ground

Ignition switch position ACC or ON

Battery positive voltage

B6 – Ground

Ignition switch position LOCK

No voltage

B1 – Ground

Constant

Battery positive voltage

If circuit is not as specified, inspect the circuits connected to oth-
er parts.
HINT:
Check the wire harness between radio receiver assembly and
the CD auto changer, between radio receiver assembly and
power amplifier.

2.

Nakamichi made:
INSPECT POWER AMPLIFIER CIRCUIT

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

Z14758

Wire Harness Side

h–14–1–A

–

BODY ELECTRICAL

AUDIO SYSTEM

BE–227

2090

Tester connection

Condition

Specified condition

A4 – Ground

Constant

Continuity

A5 – Ground

Constant

Battery positive voltage

A6 – Ground

Ignition switch position ACC or ON

Battery positive voltage

D6 – Ground

Ignition switch position ACC or ON

Radio, Tape or CD switch ON

Battery positive voltage

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

3.

Nakamichi made:
INSPECT CD AUTO CHANGER CIRCUIT

Disconnect the connectors from the controller and inspect the
connector on the wire harness side, as shown.

Tester connection to

terminal number

Condition

Specified condition

5 – Ground

Constant

Battery positive voltage

4 – Ground

Ignition switch LOCK

No voltage

4 – Ground

Ignition switch ACC or ON

Battery positive voltage

If circuit is not as specified, inspect the circuits connected to oth-
er parts.
HINT:
Since the signals to and from the AP+, AP–, SGND, GND1 ter-
minals are serial signals, they cannot ordinarily be measured
with a tester.

I03482

Wire Harness Side

Connector ”A”

Connector ”B”

I03483

Wire Harness Side

Connector ”A”

Connector ”B”

Connector ”C”

Connector ”E”

Connector ”D”

BE–228

–

BODY ELECTRICAL

AUDIO SYSTEM

2091

4.

Pioneer made:
INSPECT RADIO RECEIVER ASSEMBLY CIRCUIT

Disconnect the connectors from the radio receiver assembly.
And inspect the connector on the wire harness side, as shown.

Tester connection

Condition

Specified condition

B1 – Ground

Constant

Continuity

A6 – Ground

Ignition switch position ACC or ON

Battery positive voltage

A6 – Ground

Ignition switch position LOCK

No voltage

A1 – Ground

Constant

Battery positive voltage

If circuit is not as specified, inspect the circuits connected to oth-
er parts.
HINT:
Check the wire harness between power amplifier and the CD
auto changer, between radio receiver assembly and power am-
plifier.

5.

Pioneer made and LEXUS navigation system:
INSPECT POWER AMPLIFIER CIRCUIT

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