Lexus RX300 (MCU15). Manual — part 326

DI–536

–

DIAGNOSTICS

ENGINE IMMOBILISER SYSTEM

LEXUS RX300 (RM785E)

INSPECTION PROCEDURE

1

Check transponder key coil (See page BE–190).

NG

Replace transponder key coil

OK

2

Check harness and connector between transponder key amplifier and engine &
ECT ECU.

NG

Repair or replace harness and connector

OK

3

Does it operate normally after replacement of transponder key amplifier?

Yes

Replace transponder key amplifier.

No

Rplace engine and ECT ECU.

DI1R8–04

Customer Problem Analysis

Vehicle Brought to Workshop

Problem Symptom Confirmation

Symptom Simulation

Symptom does not occur

Problem Symptom Table

Circuit Inspection

Identification of Problem

Repair

Confirmation Test

End

Titles inside

are titles of pages in this

manual with the page number indicated in the
bottom portion. See the indicated pages
for detailed explanations.

1

2

3

5

6

8

Step 6, 8 : Diagnostic steps permitting the use of the

hand–held tester and break–out–box.

P. DI–538

P. DI–539

P. IN–22

P. DI–541 – DI–551

Symptom occur

7

Multiplex Communication System inspection*

4

P. DI–676

*: Confirm that there is no
trouble by basic inspection
and DTC check

–

DIAGNOSTICS

COMBINATION METER SYSTEM

DI–537

LEXUS RX300 (RM785E)

COMBINATION METER SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:
The ECU of this system is connected to the multiplex communication system. Therefore, before starting trou-
bleshooting, make sure to check that there is no trouble in the multiplex communication system.

DI1R9–03

DI–538

–

DIAGNOSTICS

COMBINATION METER SYSTEM

LEXUS RX300 (RM785E)

CUSTOMER PROBLEM ANALYSIS CHECK

COMBINATION METER SYSTEM Check Sheet

Inspector’s name:

Customer’s Name

Date of Vehicle
Brought In

Registration No.

Registration Year
Frame No.

Odometer Reading

/ /

km
Mile

Weather Conditions
When Problem
Occurred

Frequency Problem Occurs

Weather

Outdoor temperature

/ /

j

Constant j Sometimes ( Times per day, month)

j

Once only

j

Speedometer does not operate or abnormal operation.

j

Others.

Date Problem First Occurred

j

Fine j Cloudy j Rainy j Snowy

j

Various/Others

j

Hot j Warm j Cool

j

Cold (Approx. °F ( °C))

Problem Symptom

j

Tachometer does not operate or abnormal operation.

j

Fuel Gauge does not operate or abnormal operation.

j

Engine Coolant Temperature Gauge does not operate or abnormal operation.

j

Shift indicator light does not light up.

j

Open door warning light does not light up.

j

Discharge warning does not light up.

j

Driver seat belt warning does not light up.

j

Low oil pressure warning light does not light up.

j

Brake warning light does not light up.

j

Taillight indicator light does not light up.

j

ECT PWR indicator light does not light up.

j

CRUISE MAIN indicator light does not light up.

j

ECT SNOW indicator light does not light up.

j

TRAC OFF indicator light does not light up.

j

Washer Level warning light does not light up.

j

Rear Lights warning light does not light up.

Indicator Light and W

arning

Light

Gauge

DI1RA–06

–

DIAGNOSTICS

COMBINATION METER SYSTEM

DI–539

LEXUS RX300 (RM785E)

PROBLEM SYMPTOMS TABLE

GAUGE:

Symptom

Suspect Area

See page

Speedometer does not operate or abnormal operation.

1. Speedometer

2. Skid Control ECU

DI–541

–

Tachometer does not operate or abnormal operation.

1. Tachometer

2. Igniter Signal Circuit

DI–543

DI–547

Fuel Gauge does not operate or abnormal operation.

1. Fuel Gauge

2. Wire Harness

3. Combination Meter

DI–544

IN–32

Engine Coolant Temperature Gauge does not operate.

1. Engine Coolant Temperature Gauge

2. WIre Harness

3. Combination Meter

DI–546

IN–32

INDICATOR LIGHT AND WARNING LIGHT:

Symptom

Suspect Area

See page

Shift indicator lights does not light up.

1. Bulb circuit

2. A/T shift indicator light

3. Transmission control switch

DI–551

BE–62

DI–188

Open door warning light does not light up.

1. Bulb circuit

2. Door courtesy switch

DI–551

BE–48

Passenger seat belt warning light does not light up.

1. Bulb circuit

2. Passenger seat belt buckle switch

DI–551

BE–48

Driver seat belt warning light does not light up.

1. Bulb circuit

2. Driver seat belt buckle switch

DI–551

BE–48

Low oil pressure warning light does not light up.

1. Bulb circuit

2. Low oil pressure warning switch

DI–551

BE–68

Discharge warning light does not light up.

1. Bulb circuit

2. Alternator

DI–551

CH–2

Brake warning light does not light up.

1. Bulb circuit

2. Parking brake switch

3. Brake fluid level warning switch

4. Combination meter

DI–551

BE–68

BE–68

IN–32

Headlight indicator light does not light up. (USA models)

1. Bulb circuit

2. Headlight and Taillight System

3. Combination meter

DI–551

BE–2

IN–32

Taillight indicator light does not light up. (CANADA models)

1. Bulb circuit

2. Headlight and Taillight System

3. Combination meter

DI–551

BE–2

IN–32

CRUISE MAIN indicator light does not light up.

1. Bulb circuit

2. Cruise control switch

3. Combination meter

DI–551

DI–474

IN–32

ECT SNOW indicator light does not light up.

1. Bulb circuit

2. ECT pattern indicator signal

3. Combination meter

DI–551

–

IN–32

ECT PWR indicator light does not light up.

1. Bulb circuit

2. ECT pattern indicator signal

3. Combination meter

DI–551

–

IN–32

TRAC OFF indicator light does not light up.

1. Bulb circuit

2. Skid Control ECU

3. Combination meter

DI–551

DI–203

IN–32