Page 1937 of 2395
4 CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND AUTO AMP. (LCU)
1. Disconnect auto amp. (LCU) harness connector.
2. Check circuit continuity between sunload sensor harness terminal No. 1 and auto amp. (LCU) harness terminal No. 12
or 10.
RHA834H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©1. Replace auto amp.
2. Go to self-diagnosis step-by-step procedure (HA-45) and perform self-diagnosis STEP
2.
Confirm that code No. 20 is displayed.
NG©Repair harness or connector.
RHA835H
COMPONENT INSPECTIONNBHA0049Sunload SensorNBHA0049S01Measure voltage between auto amp. terminal 12 (10) and body
ground.
If NG, replace sunload sensor.
IWhen checking sunload sensor, select a place where sun
shines directly on it.
TROUBLE DIAGNOSES
Sunload Sensor Circuit (Cont'd)
HA-138
Page 1938 of 2395
SHA930E
RHA584E
Intake Sensor Circuit
COMPONENT DESCRIPTIONNBHA0105Intake SensorNBHA0105S01The intake sensor is located on the cooling unit. It converts tem-
perature of air after it passes through the evaporator into a resis-
tance value which is then input to the auto amp.
After disconnecting intake sensor harness connector, measure
resistance between terminals 1 and 2 at sensor harness side, using
the table below.
Temperature ÉC (ÉF) Resistance kW
þ15 (5) 12.73
þ10 (14) 9.92
þ5 (23) 7.80
0 (32) 6.19
5 (41) 4.95
10 (50) 3.99
15 (59) 3.24
20 (68) 2.65
25 (77) 2.19
30 (86) 1.81
35 (95) 1.51
40 (104) 1.27
45 (113) 1.07
If NG, replace intake sensor.
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TROUBLE DIAGNOSES
Sunload Sensor Circuit (Cont'd)
HA-139
Page 1939 of 2395
RHA056GI
DIAGNOSTIC PROCEDURENBHA0106SYMPTOM: Intake sensor circuit is open or shorted. (or
þ
is indicated on the display as a result of conducting
Self-diagnosis STEP 2.)
1 CHECK INTAKE SENSOR CIRCUIT BETWEEN INTAKE SENSOR AND BODY GROUND
Disconnect intake sensor harness connector.
Do approx. 5 volts exist between intake sensor harness terminal No. 2 and body ground?
RHA495G
YesorNo
Ye s©GO TO 2.
No©GO TO 4.
2 CHECK INTAKE SENSOR CIRCUIT BETWEEN INTAKE SENSOR AND AUTO AMP. (LCU)
1. Disconnect auto amp. (LCU) harness connector.
2. Check circuit continuity between intake sensor harness terminal No. 2 and auto amp. (LCU) harness terminal No. 11 or
9.
RHA836H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 3.
NG©Repair harness or connector.
TROUBLE DIAGNOSES
Intake Sensor Circuit (Cont'd)
HA-140
Page 1940 of 2395

3 CHECK INTAKE SENSOR
Refer to HA-139.
OK or NG
OK©1. Replace auto amp.
2. Go to self-diagnosis step-by-step procedure (HA-45) and perform self-diagnosis STEP
2.
Confirm that code No. 20 is displayed.
NG©1. Replace intake sensor.
2. Go to self-diagnosis step-by-step procedure (HA-45) and perform self-diagnosis STEP
2.
Confirm that code No. 20 is displayed.
4 CHECK INTAKE SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND AUTO AMP. (LCU)
1. Disconnect auto amp. (LCU) harness connector.
2. Check circuit continuity between intake sensor harness terminal No. 1 and auto amp. (LCU) harness terminal No. 1.
RHA837H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©1. Replace auto amp.
2. Go to self-diagnosis step-by-step procedure (HA-45) and perform self-diagnosis STEP
2.
Confirm that code No. 20 is displayed.
NG©Repair harness or connector.
Air Mix Door Motor PBR Circuit
DIAGNOSTIC PROCEDURENBHA0050For description of mode door motor and air mix door motor circuit,
refer to HA-84.
SYMPTOM: If PBR circuit is open or shorted. (þ
oris
indicated on the display as a result of conducting Self-diag-
nosis STEP 2.)
Perform diagnostic procedure for mode door motor and air
mix door motor. Refer to HA-78.
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TROUBLE DIAGNOSES
Intake Sensor Circuit (Cont'd)
HA-141
Page 1941 of 2395
RHA888H
Multiplex Communication Circuit
DIAGNOSTIC PROCEDURENBHA0118SYMPTOM:
IA/C system does not come on.
IA/C system can not controlled.
1 CHECK CIRCUIT CONTINUITY BETWEEN DISPLAY & NAVI CONTROL UNIT AND AUTO AMP.
Check circuit continuity between each terminal on Display & Navigation control unit and on auto amp.
RHA889H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 2.
NG©1. Repair harness or connector.
2. Go to ªOPERATIONAL CHECKº, HA-66.
Confirm that A/C system is in good order.
2 CHECK MULTI-PLEX COMMUNICATION SIGNAL
Do approx. 3.5 volts exist between Display & NAVI control unit harness terminal Nos. 37, 38 and body ground?
RHA890H
YesorNo
Ye s©GO TO 3.
No©1. Replace auto amp.
2. Go to ªOPERATIONAL CHECKº, HA-66.
Confirm that A/C system is in good order.
TROUBLE DIAGNOSES
Multiplex Communication Circuit
HA-142
Page 1942 of 2395
3 CHECK MULTIPLEX COMMUNICATION SIGNAL
Do approx. 3.5 volts exist between auto amp. harness terminal No. 40 and body ground?
RHA891H
YesorNo
Ye s©INSPECTION END.
No©1. Replace Display & NAVI control unit.
2. Go to ªOPERATIONAL CHECKº, HA-66.
Confirm that A/C system is in good order.
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TROUBLE DIAGNOSES
Multiplex Communication Circuit (Cont'd)
HA-143
Page 1943 of 2395
HFC-134a (R-134a) Service ProcedureNBHA0070SETTING OF SERVICE TOOLS AND EQUIPMENTNBHA0070S01DISCHARGING REFRIGERANTNBHA0070S0101WARNING:
Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Remove HFC-134a (R-134a) from A/C system using certified service equipment meeting require-
ments of SAE J2210 (R-134a recycling equipment) or J2209 (R-134a recovery equipment). If acciden-
tal system discharge occurs, ventilate work area before resuming service. Additional health and safety
information may be obtained from refrigerant and lubricant manufacturers.
SHA179FA
Evacuating System and Charging RefrigerantNBHA0070S0102
SHA180FA
SERVICE PROCEDURE
HFC-134a (R-134a) Service Procedure
HA-144
Page 1944 of 2395
SHA251FA
*1: HA-146
*2: HA-155*3: HA-157
*4: HA-114*5: HA-2
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SERVICE PROCEDURE
HFC-134a (R-134a) Service Procedure (Cont'd)
HA-145