Lexus RX300 (MCU15). Service manual — part 323

I02680

Malfunction Code (Example Code 12, 99)

0.5 Sec. 0.5 Sec.

1.5 Sec. 2.5 Sec.

One Cycle

4.5 Sec.

DI–524

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DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

LEXUS RX300 (RM785E)

(4)

When DTC ”99” is output, there is a trouble of
immobiliser. Start troubleshooting referring to
PROBLEM SYMPTOM TABLE.

(5)

After completing the check, disconnect terminals 13
(TC) and 4 (CG) and turn off the display.

HINT:
In the event of 2 or more malfunction codes, indication will begin
from the smaller numbered code and continue in order to the
larger.
(c)

Clear the DTC.
The following actions will erase the DTCs and freeze
frame data.
(1)

Operating the hand–held tester to erase the codes.

(2)

Disconnecting the battery terminals or EFI fuse.

DI1AM–20

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DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

DI–525

LEXUS RX300 (RM785E)

DIAGNOSTIC TROUBLE CODE CHART

DTC No.

(See page)

Detection Item

Trouble Area

B2795

(DI–529)

Unmatched key code

S Key

S Unregistered key inserted before

B2796

(DI–530)

No communication in immobiliser system

S Key

S Transponder key coil

S Amplifier

S Wirehaness

S Engine & ECT ECU

B2797

(DI–533)

Communication malfunction No.1

S Communication contests

S Unregistered key inserted before

B2798

(DI–535)

Communication malfunction No.2

S Key

S Transponeder key coil

S Amplifier

S Wirehaness

S Engine & ECT ECU

HINT:
To reduce the unnecessary exchange of engine & ECT ECU, check that a trouble occurs with the original
engine & ECT ECU at the time of exchanging engine & ECT ECU and the trouble will disappear with a new
engine & ECT ECU.

DI1AN–07

I07371

Transponder Key Amplifier

Transponder Key Coil

Engine & ECT ECU

DI–526

–

DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

LEXUS RX300 (RM785E)

PARTS LOCATION

DI84X–01

D01054

E6

E7

E9

E10

E8

–

DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

DI–527

LEXUS RX300 (RM785E)

TERMINALS OF ECU

Symbols (Terminals No.)

Wiring Color

Condition

STD Voltage (V)

TXCT – E1

(E10–18 ↔ E7–17)

GR ↔ BR

Ignition Switch ON

10 – 14

RXCK – E1

(E10–19 ↔ E7–17)

P ↔ BR

Ignition Switch ON

10 – 14

KSW – E1

(E10–23 ↔ E7–17)

L ↔ BR

Ignition Switch ON

10 – 14

CODE – E1

(E10–28 ↔ E7–17)

V ↔ BR

Ignition Switch ON

10 – 14