Lexus RX300 (MCU15). Service manual — part 393
I12172
Navigation ECU
Multi Display Radio Receiver
Assembly
SST
TX–
TX+
TX–
TX+
Radio receiver assembly connector ”R4”
DI–802
–
DIAGNOSTICS
LEXUS NAVIGATION SYSTEM
LEXUS RX300 (RM785E)
3
Skip radio receiver assembly and check AVC–LAN.
PREPARATION:
(a)
Connect Multi Display connector.
(b)
Disconnect radio receiver assembly ”R” connector.
(c)
Using SST (Navigation Check Wire P/N 09843–18050),
connect the terminal TX+ to terminal TX– of ”R4” connec-
tor of radio receiver assembly.
CHECK:
Operate the panel switch and the touch switch of the display
and check that the navigation functions.
(Check that AVC–LAN is recovered.)
OK
Replace the radio receiver assembly.
NG
Replace the Navigation ECU.
DI3FP–02
Customer Problem Analysis
Check and Clear DTC (Precheck)
Vehicle Brought to Workshop
Problem Symptom Confirmation
Symptom Simulation
Symptom does not
occur
DTC Check
Normal code
DTC Chart
Problem Symptoms Table
Circuit Inspection
Actuator Check
Parts Inspection
Identification of Problem
Repair
Confirmation Test
End
Items 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
4
5
6
7
8
9
10
P DI–805
P. IN–22
P.DI–809
P. DI–812
P. DI–814 – DI–855
P.DI–805
Malfunction code
P. DI–804
Step 2, 5 and 11 : Diagnostic steps permitting the
use of the hand–held tester.
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–803
LEXUS RX300 (RM785E)
AIR CONDITIONING SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Perform troubleshooting in accordance with the procedure on the following page.
DI3FQ–01
Inspector’s name:
Customer’s Name
Registration No.
Registration Year
Frame No.
Odometer Reading
km
Miles
Date vehicle
Brought In
/ /
Date of Problem Occurrence
How Often does Problem Occur?
Weather
Outdoor Temperature
/ /
j
Continuous j Intermittent ( times a day)
j
Fine j Cloudy j Snowy j Various / Other
j
Hot j Warm j Cool j Cold (Approx.
°F
°C
)
Symptoms
j
Blower motor does not operation
j
Blower motor speed does not change
(Always Hi, Always Med, Always Lo)
Air Flow Control is
Faulty
j
Cabin temperature does not go down
j
Response is slow
j
Cannot change between FRS and REC
(Always Fresh or always Recirculating)
j
Will not enter the desired mode
Temperature
Control is Faulty
Air Inlet Control is
Faulty
Vent Control is
Faulty
DTC Check
1st Time
2nd Time
j
Normal Code j Malfunction Code (Code )
j
Normal Code j Malfunction Code (Code )
AIR CONDITIONING SYSTEM Check Sheet
j
Cabin temperature does not rise
j
Mode will not chage
DI–804
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
LEXUS RX300 (RM785E)
CUSTOMER PROBLEM ANALYSIS CHECK
DI3G9–02
AT0716
0.5 Seconds
0.5 Seconds
ON
OFF
Turn ignition switch ON with AUTO and
R/F switches held down.
Indicator Check
DTC Check
(Sensor Check)
(continuous operation)
DTC Check
(Sensor Check)
(stepped operation)
Cancel check mode and can start
A/C control
Actuator Check
(continuous operation)
Actuator Check
(stepped operation)
If both Auto switch and R/F switch
are not pressed at the same time.
OFF
OFF
OFF
OFF
R/F
R/F
R/F
AUTO
AUTO
AUTO
: Indicates a switch operation.
DEF
DEF
DEF
DEF
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–805
LEXUS RX300 (RM785E)
PRE–CHECK
1.
WARNING FOR A/C COMPRESSOR LOCK
If compressor lock occurs during A/C operation, the A/C switch
indicator on the A/C control assembly starts blinking.
When this occurs, check for compressor lock (DTC B1422/22)
using diagnosis trouble code check then proceed to inspect the
circuit or the component.
Compressor lock sensor circuit. → (See page DI–826)
2.
LIST OF OPERATION METHODS
By operating each of the A/C control switches as shown in the diagram below, it is possible to enter the diag-
nosis check mode.
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