Page 480 of 3502

ATC-102
TROUBLE DIAGNOSIS
Sunload Sensor CircuitBJS000GE
COMPONENT DESCRIPTION
Sunload Sensor
The sunload sensor is located on the passenger side defroster grille.
It detects sunload entering through windshield by means of a photo
diode. The sensor converts the sunload into a current value which is
then input into the unified meter and A/C amp.
SUNLOAD INPUT PROCESS
The unified meter and A/C amp. also includes a processing circuit which averages the variations in detected
sunload over a period of time. This prevents drastic swings in the ATC system operation due to small or quick
variations in detected sunload.
For example, consider driving along a road bordered by an occasional group of large trees. The sunload
detected by the sunload sensor will vary whenever the trees obstruct the sunlight. The processing circuit aver-
ages the detected sunload over a period of time, so that the (insignificant) effect of the trees momentarily
obstructing the sunlight does not cause any change in the ATC system operation. On the other hand, shortly
after entering a long tunnel, the system will recognize the change in sunload, and the system will react accord-
ingly.
DIAGNOSIS PROCEDURE FOR SUNLOAD SENSOR
SYMPTOM: Sunload sensor circuit is open or shorted. (25 or −25 is
indicated on unified meter and A/C amp. as a result of performing
self-diagnosis STEP-2.)
1. CHECK VOLTAGE BETWEEN SUNLOAD SENSOR AND GROUND
1. Disconnect sunload sensor connector.
2. Turn ignition switch ON.
3. Check voltage between sunload sensor harness connector M61
terminal 1 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
RJIA3279E
RJIA1455E
1 – Ground : Approx. 5 V
RJIA2027E
Page 541 of 3502
AUDIO (WITH INTEGRATED DISPLAY SYSTEM)
AV-13
C
D
E
F
G
H
I
J
L
MA
B
AV
A/C and AV Switch Self-Diagnosis FunctionBKS0020P
Performing self-diagnosis makes it possible to check operation of A/C and AV switch indicator (LED) and other
switches.
STARTING THE SELF-DIAGNOSIS MODE
1. Turn ignition switch OFF.
2. With three switches (DEF, REC/FRE and MODE) pressed simul-
taneously, turn the ignition switch to ACC.
DIAGNOSIS FUNCTION
The following are checked:
All the indicators (LED) in the A/C and AV switch.
Continuity of the switches by sounding the buzzer when pressing the A/C and AV switch.
NOTE:
Indicators (LED) of REC/FRE switch change to “FRE” → “REC” → “FRE” every time the REC/FRE switch
is pressed. (These two do not turn on at the same time.)
Impossible to check rear window defogger switch operation (No beep sound even under normal status).
EXITING THE SELF-DIAGNOSIS MODE
Turn ignition switch OFF.
SKIB1188E
Page 542 of 3502

AV-14
AUDIO (WITH INTEGRATED DISPLAY SYSTEM)
Symptom ChartBKS0020Q
The majority of the audio malfunctions are the result of outside causes (bad CD, electromagnetic interfer-
ence, etc.). Check the symptoms below to diagnose the malfunction.
The vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunction-
ing. Check if noise is caused and/or changed by engine speed, ignition switch turned to each position, and
operation of each piece of electrical equipment, and then determine the cause.
CD-R is not guaranteed to play because they can contain compressed audio (MP3, WMA) or could be
incorrectly mastered by the customer on a computer.
Check if the CDs carry the Compact Disc Logo. If not, the disc is not mastered to the “red book” Compact
Disc Standard and may not play.
Make sure that other operation except audio system can be performed with A/C and AV switch. If these
operations are inoperative with A/C and AV switch, refer to AV- 5 8 , "
Unable to Operate System with A/C
and AV Switch" .
NOTE:
Noise resulting from variations in field strength, such as fading noise and multi-path noise, or external noise
from trains and other sources. It is not a malfunction.
Fading noise: This noise occurs because of variations in the field strength in a narrow range due to moun-
tains or buildings blocking the signal.
Multi-path noise: This noise results from a time difference between the broadcast waves directly from the
station arriving at the antenna and the waves reflected by mountains or buildings.
Symptom Possible malfunction location
Audio system does not work properly.
Audio unit power supply circuit
Communication signal circuit between audio unit and display unit
A/C and AV switch
Audio unit
No sound can be heard from all speakers. Audio unit
No sound can be heard from one or several speakers.
Audio signal circuit between audio unit and speaker
Speaker
Tw e e te r
Audio unit
No sound can be heard from radio or noise is caught.
Antenna amp. ON signal circuit
Antenna feeder
Rear window antenna
Antenna amp.
Audio unit
Page 560 of 3502

AV-32
AUDIO (WITH INTEGRATED COLOR DISPLAY SYSTEM)
A/C and AV Switch Self-Diagnosis FunctionBKS0028U
Performing self-diagnosis makes it possible to check operation of A/C and AV switch indicator (LED) and other
switches.
STARTING THE SELF-DIAGNOSIS MODE
1. Turn ignition switch OFF.
2. With three switches (DEF, REC/FRE and MODE) pressed simul-
taneously, turn the ignition switch to ACC.
DIAGNOSIS FUNCTION
The following are checked:
All the indicators (LED) in the A/C and AV switch.
Continuity of the switches by sounding the buzzer when pressing the A/C and AV switch.
Continuity of the switches by sounding the buzzer when pressing the rear audio control switch.
NOTE:
Indicators (LED) of REC/FRE switch change to “FRE” → “REC” → “FRE” every time the REC/FRE switch
is pressed. (These two do not turn on at the same time.)
Impossible to check rear window defogger switch operation (No beep sound even under normal status).
EXITING THE SELF-DIAGNOSIS MODE
Turn ignition switch OFF.
SKIB1188E
Page 561 of 3502

AUDIO (WITH INTEGRATED COLOR DISPLAY SYSTEM)
AV-33
C
D
E
F
G
H
I
J
L
MA
B
AV
Symptom ChartBKS0028V
The majority of the audio malfunctions are the result of outside causes (bad CD, electromagnetic interfer-
ence, etc.). Check the symptoms below to diagnose the malfunction.
The vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunction-
ing. Check if noise is caused and/or changed by engine speed, ignition switch turned to each position, and
operation of each piece of electrical equipment, and then determine the cause.
CD-R is not guaranteed to play because they can contain compressed audio (MP3, WMA) or could be
incorrectly mastered by the customer on a computer.
Check if the CDs carry the Compact Disc Logo. If not, the disc is not mastered to the “red book” Compact
Disc Standard and may not play.
Make sure that other operation except audio system can be performed with A/C and AV switch. If these
operations are inoperative with A/C and AV switch, refer to AV- 9 7 , "
Unable to Operate System with A/C
and AV Switch" .
NOTE:
Noise resulting from variations in field strength, such as fading noise and multi-path noise, or external noise
from trains and other sources. It is not a malfunction.
Fading noise: This noise occurs because of variations in the field strength in a narrow range due to moun-
tains or buildings blocking the signal.
Multi-path noise: This noise results from a time difference between the broadcast waves directly from the
station arriving at the antenna and the waves reflected by mountains or buildings.
Symptom Possible malfunction location
Audio system does not work properly.
Audio unit power supply circuit
Communication signal circuit between audio unit and display unit
A/C and AV switch
Audio unit
CD auto changer does not work properly.
CD auto changer power supply circuit
Communication signal circuit between audio unit and CD auto changer
CD auto changer
Audio unit
No sound can be heard from all speakers. Audio unit
No sound can be heard from one or several speakers.
Audio signal circuit between audio unit and speaker
Speaker
Tweeter
Audio unit
No sound can be heard from radio or noise is caught.
Antenna amp. ON signal circuit
Antenna feeder
Rear window antenna
Antenna amp.
Audio unit
Unable to operate audio system with rear audio control
switch.
Remote control signal circuit between rear audio control switch and A/C
and AV switch
Rear audio control switch
A/C and AV switch
Page 582 of 3502
AV-54
INTEGRATED DISPLAY SYSTEM
A/C and AV Switch Self-Diagnosis FunctionBKS0022A
Performing self-diagnosis makes it possible to check operation of A/C and AV switch indicator (LED) and other
switches.
STARTING THE SELF-DIAGNOSIS MODE
1. Turn ignition switch OFF.
2. With three switches (DEF, REC/FRE and MODE) pressed simul-
taneously, turn the ignition switch to ACC.
DIAGNOSIS FUNCTION
The following are checked:
All the indicators (LED) in the A/C and AV switch.
Continuity of the switches by sounding the buzzer when pressing the A/C and AV switch.
NOTE:
Indicators (LED) of REC/FRE switch change to “FRE” → “REC” → “FRE” every time the REC/FRE switch
is pressed. (These two do not turn on at the same time.)
Impossible to check rear window defogger switch operation (No beep sound even under normal status).
EXITING THE SELF-DIAGNOSIS MODE
Turn ignition switch OFF.
SKIB1188E
Page 612 of 3502

AV-84
INTEGRATED COLOR DISPLAY SYSTEM
Special Note for Trouble DiagnosisBKS0027V
Prior to performing trouble diagnosis, make sure there are no corresponding description in the “Example of
Symptoms Possible No Malfunction”. Refer to AV- 111 , "
Example of Symptoms Possible No Malfunction" .
A/C and AV Switch Self-Diagnosis FunctionBKS00280
Performing self-diagnosis makes it possible to check operation of A/C and AV switch indicator (LED) and other
switches.
STARTING THE SELF-DIAGNOSIS MODE
1. Turn ignition switch OFF.
2. With three switches (DEF, REC/FRE and MODE) pressed simul-
taneously, turn the ignition switch to ACC.
DIAGNOSIS FUNCTION
The following are checked:
All the indicators (LED) in the A/C and AV switch.
Continuity of the switches by sounding the buzzer when pressing the A/C and AV switch.
Continuity of the switches by sounding the buzzer when pressing the rear audio control switch.
NOTE:
Indicators (LED) of REC/FRE switch change to “FRE” → “REC” → “FRE” every time the REC/FRE switch
is pressed. (These two do not turn on at the same time.)
Impossible to check rear window defogger switch operation (No beep sound even under normal status).
EXITING THE SELF-DIAGNOSIS MODE
Turn ignition switch OFF.
SKIB1188E
Page 618 of 3502

AV-90
INTEGRATED COLOR DISPLAY SYSTEM
Vehicle Signal
A comparison check can be made of each actual vehicle signal and
the signals recognized by the display control unit.
History of Error
Diagnosis results of self-diagnosis depend on if any error occurred
during the time after selecting “DCU Failure Diagnosis” until self-
diagnosis results is displayed.
Meanwhile, when an error occurs before selecting “DCU Failure
Diagnosis”, and if an error does not occur until self-diagnosis results
is displayed, a diagnosis result is judged as normal.
Consequently, a diagnosis needs to be performed with “History of
Error” for the past error that is not available with self-diagnosis.
“History of Error” stores error occurrences up to 50, and errors after
the 51st are displayed as the 50th.
SKIB0835E
Diagnosis item Display Condition Remarks
Speed SignalON When vehicle speed is more than 0 km/h (0 MPH)
Changes in indication may be delayed.
This is normal. OFF When vehicle speed is 0 km/h (0 MPH)
— Ignition switch in ACC position
LightON Lighting switch ON
—
OFF Lighting switch OFF
IGNON Ignition switch ON
—
OFF Ignition switch ACC position
ReverseON Selector lever in R position
Changes in indication may be delayed.
This is normal. OFF Selector lever in any position other than R position
— Ignition switch in ACC position
SKIB8900E